CN102118453B - Method, service device, client and communication system for automatic configuration of IP address - Google Patents

Abstract

The embodiment of the invention discloses an IP address automatic configuration method, a server device, a client computer and a communication system. The method includes determining a client computer with an official IP address within the communication range to which the client computer with the official IP address belongs, and the official IP address is a configured IP address; sending a message to the client computer with the official IP address A relay configuration indication message, the relay configuration indication message carries DHCP configuration information; when the client with the formal IP address configures the machine as a DHCP repeater according to the DHCP configuration information, it is configured as a DHCP The client computer of the repeater assigns a formal IP address to the client computer to be configured with a formal IP address. In the embodiment of the present invention, when the DHCP is used to automatically configure the IP address, there is no need to set up a dedicated DHCP repeater, thereby reducing system investment and maintenance costs.

Description

IP address automatic configuration method, server device, client computer and communication system

technical field

The embodiment of the present invention relates to network communication technology, in particular to an IP address automatic configuration method, a server device, a client computer and a communication system.

Background technique

The Internet Protocol (IP) address can be used as the identification of user equipment and network equipment in the IP network, and can also be used as the identification of IP packet forwarding. Therefore, the configuration of the IP address is the core of the entire IP network. An IP address includes an IPv4 address and an IPv6 address. Taking an IPv4 address as an example, an IPv4 address is an address of 32-bit binary code, including two parts of a network identification (Identify, ID) and a host ID. Different network IDs are assigned to network segments of different gateways, and all hosts with the same network ID are linked to the same network segment of the same gateway. To plan the corresponding network ID. Furthermore, when the network segment to which the client belongs is divided into multiple virtual local area networks (Virtual Local Area Network, VLAN), different VLANs adopt different IP address plans. At this time, when configuring the IP address for the client, not only Network segment information, but also VLAN information. The IP address is a logical address that needs to correspond to the physical identifier of the device, for example, the Media Access Control (MAC) address of the device. Therefore, the IP address needs to be associated with the MAC address during configuration.

Currently, IP address configuration schemes include manual configuration of IP addresses and automatic acquisition of IP addresses, among which the automatic acquisition of IP addresses is commonly used. Dynamic Host Configuration Protocol (DHCP) is currently the most widely used automatic IP address configuration technology in IP networks. The DHCP technology involves a server and a client. The server centrally manages the configuration data of the IP network, and is responsible for processing the client's DHCP request and configuring an IP address for the client; the client uses the IP address configured by the server.

The process of DHCP is roughly as follows:

The first step, when the client computer finds that there is no IP configuration data on the local computer, it broadcasts a DHCP search (DHCP DISCOVER) packet in the network;

In the second step, when the DHCP server monitors the DHCP search packet sent by the client computer, it will configure an IP address for the client computer, and carry the configured IP address and the rest of the IP configuration data in the DHCP response (DHCP OFFER) packet and return to the client. Client computer;

In the third step, when the client computer receives the DHCP response packets returned by multiple servers, select an IP address among multiple DHCP packets, or, when the client computer only receives the DHCP response packets returned by one server, select the IP address of the DHCP server. IP address in the packet, and broadcast a DHCP broadcast (DHCP REQUEST) packet to the network, and notify all servers in the network of the IP address selected by the client;

In the 4th step, after the server receives the DHCP broadcast packet, it returns a DHCP acknowledgment (DHCP ACK) packet to the client computer to confirm that the IP configuration is formally effective, and ends the entire DHCP process.

Among them, in the above process, when the client and the server are located in different network segments, a DHCP relay (Relay) needs to be set in the network, and the DHCP relay forwards the interaction packets transmitted between the client and the server. , for example, the above-mentioned DHCP search packet, DHCP response packet, DHCP broadcast packet and DHCP confirmation packet.

There are at least the following problems in the prior art: when the client and server in DHCP are located in different network segments, a dedicated DHCP repeater is required, and setting a dedicated DHCP repeater will undoubtedly increase investment and maintenance costs.

Contents of the invention

The embodiment of the present invention provides an IP address automatic configuration method, a server device, a client computer and a communication system, which are used to solve the problem of high investment and maintenance costs caused by the need for a dedicated DHCP repeater in the prior art .

An embodiment of the present invention provides a method for automatically configuring an IP address, including: the server device determines the client with the official IP address within the communication range of the client to be configured with the official IP address, and the official IP address is configured. IP address; the server device sends a relay configuration indication message to the client with the official IP address, and the relay configuration indication message carries the DHCP configuration information of the dynamic host configuration protocol; when the client with the official IP address according to After the DHCP configuration information configures the machine as a DHCP repeater, the server device assigns a formal IP address to the client to be configured with a formal IP address through the client configured as a DHCP repeater.

The embodiment of the present invention also provides a method for automatically configuring an IP address, including: a client having an official IP address receives a relay configuration indication message sent by a server device, and the relay configuration indication message carries a dynamic host configuration protocol DHCP Configuration information, the client that already has an official IP address and the client to be configured with an official IP address are within the same communication range; the client that already has an official IP address configures the machine as a DHCP relay according to the DHCP configuration information device; the client computer configured as a DHCP repeater provides a DHCP relay function, so that the server device assigns a formal IP address to the client computer to be configured with a formal IP address.

An embodiment of the present invention provides a server device, including: a client determining module, configured to determine a client with an official IP address within the communication range to which the client whose official IP address is to be configured belongs, and the official IP address is The configured IP address; the sending module is used to send a relay configuration instruction message to the client with the official IP address, and the relay configuration instruction message carries dynamic host configuration protocol DHCP configuration information; the distribution module is used when the client After the client computer with the official IP address configures itself as a DHCP repeater according to the DHCP configuration information, the client computer configured as the DHCP repeater assigns an official IP address to the client computer to be configured with an official IP address.

An embodiment of the present invention provides a client, including: a receiving module, configured to receive a relay configuration indication message sent by a server device, the relay configuration indication message carrying dynamic host configuration protocol DHCP configuration information; a configuration module, used to According to the DHCP configuration information, the local machine is configured as a DHCP repeater; the relay module is used to provide a DHCP relay function, and realize that the server device assigns a formal IP address to a client to be configured with a formal IP address.

An embodiment of the present invention provides a communication system, including: the above-mentioned server device; and the above-mentioned client.

In the embodiment of the present invention, a client with a formal IP address is configured as a DHCP repeater. When DHCP is used to configure an IP address, a dedicated DHCP repeater does not need to be set in the network system, thereby reducing network investment and maintenance costs.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the schematic flow chart of the method of the first embodiment of the present invention;

Fig. 2 is a schematic flow chart of the method of the second embodiment of the present invention;

3 is a schematic flow diagram of a method according to a third embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a network system corresponding to a third embodiment of the present invention;

5 is a schematic flow diagram of a method according to a fourth embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a network system corresponding to a fourth embodiment of the present invention;

7 is a schematic flow chart of a method according to a fifth embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a network system corresponding to a fifth embodiment of the present invention;

FIG. 9 is a schematic flow chart of a method according to a sixth embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a network system corresponding to a sixth embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a server device according to a seventh embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a client computer according to an eighth embodiment of the present invention;

Fig. 13 is a schematic structural diagram of a communication system according to a ninth embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Fig. 1 is a schematic flow chart of the method of the first embodiment of the present invention, including:

Step 11: The server device determines the client with the official IP address within the communication range of the client whose official IP address is to be configured, and the official IP address is the configured IP address.

Wherein, the server device may include a DHCP unit, which can provide a DHCP server function, that is, when the client computer uses the DHCP process to request an IP address, the DHCP unit can provide the client computer with a corresponding official IP address.

In order to implement the DHCP process smoothly, the server device can also include an automatic address assignment protocol (IP Auto Configuration Protocol, IACP) unit, which is used to assign a temporary IP address to the client computer.

The above-mentioned DHCP unit and IACP unit can be located in the same physical entity. At this time, the server device can be specifically the physical entity to which the DHCP unit and IACP unit belong; the above-mentioned DHCP unit and IACP unit can also be located in different physical entities. , at this time, the server device may specifically include the physical entity to which the DHCP unit belongs and the physical entity to which the IACP unit belongs. For the specific functions and process applications of the above DHCP unit and IACP unit, reference may be made to the following embodiments.

Among them, the configured IP address refers to the IP address obtained by DHCP, or the IP address obtained by manual configuration, or the IP address obtained by other dynamic IP address allocation methods. The configured IP address is An IP address in the usual sense in a communication system. The temporary IP address is an IP address temporarily used in order to obtain an official IP address.

Wherein, when the system does not perform VLAN planning, the communication range is a certain network segment; when the system performs VLAN planning, the communication range is a certain VLAN of a certain network segment.

Step 12: the server device sends a relay configuration indication message to the client with the official IP address, and the relay configuration indication message carries DHCP configuration information.

Step 13: After the client computer with the official IP address configures the client computer with the official IP address as a DHCP repeater according to the DHCP configuration information, the server device is configured as the client computer of the DHCP repeater. The client computer whose official IP address is to be configured is assigned an official IP address.

In this embodiment, a client with an official IP address is configured as a DHCP repeater. When DHCP is used to configure an IP address, a dedicated DHCP repeater does not need to be set in the network system, thereby reducing network investment and maintenance costs.

Fig. 2 is a schematic flow chart of a method according to a second embodiment of the present invention, including:

Step 21: The client computer that already has a formal IP address receives the relay configuration instruction message sent by the server device. The relay configuration instruction message carries DHCP configuration information. The client computer that already has a formal IP address and the official IP address to be configured The clients are within the same communication range;

Step 22: The client computer having the official IP address configures the client computer as a DHCP repeater according to the DHCP configuration information;

Step 23: The client configured as a DHCP repeater provides a DHCP relay function, so that the server device assigns a formal IP address to the client to be configured with a formal IP address.

Further, this embodiment may also include: before the client computer having the official IP address has the official IP address, it also includes the step of obtaining the official IP address; after obtaining the official IP address, the server device sends the official IP address An indication message, the server device sends the relay configuration indication message after receiving the official IP address indication message.

Wherein, the client obtains the official IP address including:

The client computer receives the detection packet sent by the server device, which carries the temporary IP address, the IP address of the gateway of the communication range, the IP address of the server device and the network mask of the communication range; the client computer according to The temporary IP address, the IP address of the gateway of the communication range, the IP address of the server device and the network mask of the communication range, send a unicast DHCP request to the server device, and receive the server device according to the unicast DHCP request. Requests the official IP address assigned to this client.

In this embodiment, a client with an official IP address is configured as a DHCP repeater. When DHCP is used to configure an IP address, a dedicated DHCP repeater does not need to be set in the network system, thereby reducing network investment and maintenance costs.

The embodiment of the present invention is mainly based on the following idea: when the DHCP client and the DHCP server are not in the same network segment, a DHCP repeater is required in the system for the smooth allocation of IP addresses. And if the special-purpose DHCP repeater of special setting can increase cost, in order to solve this problem, the embodiment of the present invention does not set special-purpose DHCP repeater, but configures the client computer with official IP address as DHCP repeater, when After the DHCP repeater exists, the existing DHCP process can be used for formal IP address allocation. Further, since a client computer with an official IP address is required in the above-mentioned process of configuring as a DHCP repeater, and there may not be any client computer with an official IP address initially in the communication range, at this time, it is necessary to provide At least one client computer within the range is assigned a formal IP address, so that the client computer assigned a formal IP address can be configured as a DHCP relay agent. In the embodiment of the present invention, a formal IP address is allocated to at least one client within the communication range by means of a temporary IP address, and the temporary IP address is realized by using the IACP process.

The specific process of IACP can be implemented as follows:

First, the client obtains an IP packet including an unassigned IP address. For example, when the client and the IP address allocation server are not in the same network segment, the client receives the first address resolution protocol ARP request packet sent by the access router of the network segment where the client is located; or, when the client and When the IP address allocation server is in the same network segment, the client receives the second ARP request packet sent by the IP address allocation server.

Secondly, the client detects whether the unallocated IP address in the obtained IP packet is occupied. For example, send detection messages including unallocated IP addresses to other nodes in this network segment; detect whether the unallocated IP addresses are occupied according to response messages replied by other nodes in this network segment.

Again, if the undistributed IP address is not occupied, it is judged whether the undistributed IP address is obtained by the client, and if so, the undistributed IP address client obtains the IP message comprising the undistributed IP address. For example, according to the received comparison information carried in the gratuitous ARP request packet sent by other clients, it is judged whether the client obtains the unallocated IP address.

Among them, the reason why the client computer with an official IP address is selected is that only after the client computer has an official IP address, the server device can exchange information with the client computer according to the normal IP process, for example, the relay configuration indication message sent to the client.

Wherein, the DHCP configuration information may be stored in advance in the server device, and a certain device may have the function of a DHCP repeater after being configured according to the DHCP configuration information. Therefore, when the server device sends the DHCP configuration information to the client computer, the client computer that receives the DHCP can configure itself as a DHCP server according to the DHCP configuration information. The content of the specific DHCP configuration information can be obtained from the DHCP configuration information required by the existing DHCP relay, which is not within the focus of the embodiments of the present invention.

It can be seen from the above that the embodiment of the present invention may require the IACP process and the DHCP process. Therefore, in this case, the client and the server need to have both the IACP function and the DHCP function respectively. Therefore, in the following embodiments, the client computer may be a client computer having the IACP function and the DHCP function. On the server side, the unit with IACP function and the unit with DHCP function can be set in the same physical entity, at this time, the server device is a server with IACP function and DHCP function; or, the unit with IACP function and the unit with The units with the DHCP function may also be set in different physical entities. In this case, the server device includes an IACP server with the IACP function and a DHCP server with the DHCP function. The following embodiments will be described by taking the example that the IACP function and the DHCP function are set in the same physical entity, and that the IACP function and the DHCP function are set in different physical entities.

It can also be known from the above content that the network system does not need to perform VLAN planning. At this time, the communication range refers to the network segment; VLAN planning can also be performed. At this time, the communication range is the network segment and the VLANs under the network segment. The following embodiments will be described by taking no VLAN planning and VLAN rules as examples respectively.

FIG. 3 is a schematic flowchart of a method according to the third embodiment of the present invention. In this embodiment, VLAN planning is not performed, and the IACP function and the DHCP function are set in the same physical entity as an example.

Fig. 4 is the corresponding network system structure schematic diagram of the third embodiment of the present invention, referring to Fig. 4, comprises at least one client computer 41, and this client computer communicates with IACP+DHCP server 44 through Ethernet (Ethernet) 42 and router 43, The IACP+DHCP server 44 may have an IACP function and a DHCP function. In this embodiment, a DHCP repeater needs to be configured in the network segment to which the client computer to be assigned a formal IP address belongs.

In this embodiment, unless otherwise specified, the network segment refers to the network segment to which the client to be assigned a formal IP address belongs.

Referring to Fig. 3, the present embodiment includes:

Step 301: After the IACP+DHCP server is started, determine whether the IACP+DHCP server and the client computer to be assigned a formal IP address belong to the same network segment, if so, go to step 311, otherwise, go to step 302.

Wherein, the relevant information of the client computer is stored in the IACP+DHCP server, and the relevant information includes the network segment identifier of the network segment to which the client computer belongs. Whether the clients are in the same network segment.

Step 302: The IACP+DHCP server judges whether there is an available DHCP repeater in the network segment to which the client to be assigned an official IP address belongs, and if so, executes step 310; otherwise, executes step 303.

Specifically, a client with an official IP address in the network system may send a relay capability indication message to the IACP+DHCP server, where the relay capability indication message carries the network segment identifier and capability indication information.

Therefore, the IACP+DHCP server can use the following method to judge whether there is an available DHCP repeater in the network segment:

When the IACP+DHCP server receives the relay capability indication message sent by the client, the relay capability indication message carries capability indication information and a network segment identifier, and when the capability indication information indicates that the client that sends the relay capability indication message has Relay capability, and the network segment identifier indicates that the client computer sending the official IP address indication message is in the same network segment as the client computer whose official IP address is to be configured, the IACP+DHCP server obtains that there is an available DHCP server in the network segment Repeater; It can be understood that the "available DHCP repeater" here can be a DHCP repeater configured by a client with a formal IP address, or it may be a dedicated DHCP repeater in the prior art. Repeater.

When the IACP+DHCP server does not receive the relay capability indication message, or receives the relay capability indication message but the capability indication information indicates that the client sending the relay capability indication message does not have relay capability, or, When the relay capability indication message is received but the network segment identifier indicates that the client computer sending the official IP address indication message is not in the same network segment as the client computer whose official IP address is to be configured, the IACP+DHCP server obtains the network segment There is no DHCP repeater available.

Step 303: the IACP+DHCP server judges whether there is a client with a formal IP address in the network segment, if so, execute step 307, otherwise, execute step 304.

Specifically, after the client computer in the network system is started, the client computer that has been configured with a formal IP address (for example, using a manual configuration method or a DHCP configuration method) can send a formal IP address indication message to the IACP+DHCP server. The network segment identifier is carried in the address indication message.

Therefore, the IACP+DHCP server can use the following methods to judge whether there is a client with a formal IP address in the network segment:

When the IACP+DHCP server receives the official IP address indication message carrying the network segment identifier sent by the client, and the network segment identification indicates that the client computer sending the official IP address indication message is in the same relationship as the client computer with the official IP address to be configured In the same network segment, the IACP+DHCP server obtains that there is a client computer configured with a formal IP address in the network segment;

When the IACP+DHCP server does not receive the official IP address indication message, or, the official IP address indication message is received but the network segment identifier indicates that the client computer sending the official IP address indication message is related to the official IP address to be configured When the client computers are not in the same network segment, the IACP+DHCP server obtains that there is no client computer configured with a formal IP address in the network segment.

Step 304: The IACP+DHCP server uses IACP to assign a temporary IP address to the temporary client in the network segment.

Among them, during the IACP process, the IACP server will allocate an IP address for the network segment. In order to distinguish it from the IP address allocated by the DHCP process, the IP address allocated by the IACP server is called a temporary IP address, and the client receiving the temporary IP address is called a temporary IP address. Temporary client.

Specifically, IACP is a protocol for an IACP server to actively configure an IP address for a client. After the IACP server is started, it periodically sends a detection packet to the destination network segment, wherein the destination address in the detection packet is an unallocated IP address selected by the IACP server, and the detection packet also carries the IP address of the gateway in the destination network segment. The netmask of the destination network segment and the IP address of the IACP server. After the gateway in the destination network segment receives the detection packet, it broadcasts the request packet to the destination network segment. After the client computer receives the request packet, the client computer that has not yet assigned an IP address elects a client computer to receive the IP address selected by the IACP server. , and then the selected client computer receives the detection packet sent by the IACP server, and obtains the IP address assigned by the IACP server.

Step 305: The temporary client obtains the official IP address from the IACP+DHCP server by using the unicast DHCP process according to the temporary IP address in the detection packet, the IP address of the gateway, the network mask and the IP address of the IACP+DHCP server.

Specifically, when the temporary client knows that itself and the IACP+DHCP server are in the same network segment according to the network mask, it can send a DHCP search packet to the IACP+DHCP server according to the IP address of the IACP+DHCP server, and the IACP+DHCP server receives After the DHCP searches for the packet, the official IP address is assigned, and the normal DHCP process is performed. When the temporary client knows that it is not in the same network segment as the IACP+DHCP server according to the network mask, it can send a DHCP search packet to the IACP+DHCP server through the gateway according to the IP address of the gateway and the IP address of the IACP+DHCP server. + After receiving the DHCP search packet, the DHCP server assigns a formal IP address and proceeds with the normal DHCP process.

After the temporary client obtains the official IP address, the temporary client can release the temporary IP address, and the IACP+DHCP server can reclaim the temporary IP address. In this case, the temporary IP address can still be used again later.

Step 306: The client with the official IP address sends an official IP address indication message to the IACP+DHCP server, and the official IP address indication message carries the network segment identifier.

Afterwards, step 303 may be repeatedly performed.

It can be understood that after the temporary client acquires the official IP address, the temporary client is also a client with the official IP address.

Step 307: the IACP+DHCP server sends a relay configuration indication message to the client with the official IP address, and the relay configuration indication message carries DHCP configuration information.

Step 308: the client with the official IP address configures itself as an available DHCP repeater according to the DHCP configuration information.

Thereafter, step 302 may be repeatedly performed.

Step 309: The DHCP relay can be used to send a relay capability indication message to the IACP+DHCP server, and the relay capability indication message carries capability indication information and a network segment identifier.

It can be understood that, after the client computer with the official IP address is configured as an available DHCP repeater, the client computer with the official IP address is also an available DHCP repeater.

Step 310: the IACP+DHCP server assigns an official IP address to the client computer to be assigned an official IP address through an available DHCP repeater.

Specifically, since there is a DHCP repeater in the network system, IP addresses can be allocated according to a normal DHCP process.

Step 311: the IACP+DHCP server directly assigns the official IP address to the client computer to be configured with the official IP address.

Specifically, since the client computer to be assigned an IP address is in the same network segment as the IACP+DHCP server, the IP address can be assigned according to a normal DHCP process.

In the technical solution of this embodiment, by configuring the client with a formal IP address as a DHCP repeater, when DHCP is used to configure the IP address, there is no need to set a dedicated DHCP repeater in the network system to realize network investment and maintenance. cost reduction;

Further, this embodiment adopts the network segment identifier when making related judgments, which can be applicable to scenarios where the network system does not perform VLAN planning;

In addition, this embodiment carries the address of the IACP+DHCP server in the detection packet in the IACP process, which is applicable to a scenario where the DHCP function and the IACP function are combined in the same physical entity.

FIG. 5 is a schematic flowchart of a method according to a fourth embodiment of the present invention. In this embodiment, VLAN planning is not performed, and the IACP function and the DHCP function are set in different physical entities as an example.

Fig. 6 is the corresponding network system structure schematic diagram of the fourth embodiment of the present invention, referring to Fig. 6, comprises at least one client computer 61, and this client computer 61 passes Ethernet (Ethernet) 62 and router 63, and IACP server 64 and DHCP server 65 communication, the IACP server 64 has an IACP function, and the DHCP server 65 has a DHCP function. In this embodiment, a DHCP repeater needs to be configured in the network segment to which the client computer to be assigned a formal IP address belongs.

In this embodiment, unless otherwise specified, the network segment refers to the network segment to which the client to be assigned a formal IP address belongs.

Referring to Figure 5, this embodiment includes:

Step 501: The judging device judges whether the DHCP server and the client to be assigned a formal IP address belong to the same network segment, if yes, go to step 511, otherwise, go to step 502.

Wherein, the judging device may be a functional module in the server device, and the judging device may be located in the IACP server, or located in the DHCP server, or independently set outside the IACP server and the DHCP server. In Fig. 5, it is taken as an example to determine that the device is located in the IACP server.

Wherein, the relevant information of the client computer is stored in the judging device, and the related information includes the network segment identifier of the network segment to which the client computer belongs, so the judging device can judge whether the DHCP server and the client computer to be assigned a formal IP address are in the same network. network segment.

Step 502: The judging device judges whether there is an available DHCP repeater in the network segment to which the client to be assigned an official IP address belongs, and if so, executes step 510; otherwise, executes step 503.

Specifically, a client with an official IP address in the network system may send a relay capability indication message to the judging device, where the relay capability indication message carries a network segment identifier and capability indication information.

Therefore, the judging device can use the following method to judge whether there is an available DHCP repeater in the network segment:

When the judging device receives the relay capability indication message sent by the client, the relay capability indication message carries capability indication information and network segment identification, when the capability indication information indicates that the client sending the relay capability indication message has a relay capability, and the network segment identifier indicates that the client computer sending the official IP address indication message is in the same network segment as the client computer whose official IP address is to be configured, the judging device obtains that there is an available DHCP repeater in the network segment; It can be understood that the "available DHCP repeater" here may be a DHCP repeater configured by a client with an official IP address, or may also be a dedicated DHCP repeater in the prior art.

When the judging device does not receive the relay capability indication message, or receives the relay capability indication message but the capability indication information indicates that the client that sends the relay capability indication message does not have the relay capability, or receives When the relay capability indication message but the network segment identifier indicates that the client computer sending the official IP address indication message is not in the same network segment as the client computer whose official IP address is to be configured, the judging device obtains that there is no available IP address in the network segment. DHCP repeater.

Step 503: The judging device judges whether there is a client with an official IP address in the network segment, if yes, go to step 507, otherwise, go to step 504.

Specifically, after the client in the network system is started, the client that has been configured with a formal IP address (for example, using manual configuration or DHCP configuration) can send a formal IP address indication message to the judging device, and the formal IP address indicates The network segment identifier is carried in the message.

Therefore, the judging device can use the following method to judge whether there is a client with a formal IP address in the network segment:

When the judging device receives the official IP address indication message sent by the client computer and carries the network segment identifier, and the network segment identifier indicates that the client computer sending the official IP address indication message is in the same network as the client computer whose official IP address is to be configured network segment, the judging device obtains that there is a client computer configured with a formal IP address in the network segment;

When the judging device does not receive the official IP address indication message, or receives the official IP address indication message but the network segment identifier indicates that the client computer sending the official IP address indication message and the client computer with the official IP address to be configured When they are not in the same network segment, the judging device obtains that there is no client computer configured with a formal IP address in the network segment.

Step 504: After the judging device triggers the startup of the IACP server, the IACP server uses the IACP to assign a temporary IP address to the temporary client in the network segment.

Since the IACP server and the DHCP server in this embodiment are set separately, the address of the server in the detection packet in this embodiment is the IP address of the IACP server and the IP address of the DHCP server. Refer to step 304 for the rest of the content.

Step 505: According to the temporary IP address in the detection packet, the IP address of the gateway, the netmask and the IP address of the DHCP server, the temporary client obtains the official IP address from the DHCP server through the unicast DHCP process.

Specifically, when the temporary client knows that itself and the DHCP server are in the same network segment according to the network mask, it can send a DHCP search packet to the DHCP server according to the IP address of the DHCP server, and the DHCP server assigns a formal IP address after receiving the DHCP search packet. , and proceed with the normal DHCP process. When the temporary client knows that it is not in the same network segment as the DHCP server according to the network mask, it can send a DHCP search packet to the DHCP server through the gateway according to the IP address of the gateway and the IP address of the DHCP server, and the DHCP server receives the DHCP search packet After assigning a formal IP address, proceed with the normal DHCP process.

After the temporary client computer obtains the official IP address, the temporary client computer can release the temporary IP address, and the DHCP server can reclaim the temporary IP address. In this way, the temporary IP address can still be used again later.

Step 506: The client with the official IP address sends an official IP address indication message to the judging device, and the official IP address indication message carries a network segment identifier.

Afterwards, step 503 may be repeatedly performed.

It can be understood that after the temporary client acquires the official IP address, the temporary client is also a client with the official IP address.

Step 507: The judging device sends a relay configuration indication message to the client with the official IP address, and the relay configuration indication message carries DHCP configuration information.

Step 508: The client with the official IP address configures itself as an available DHCP repeater according to the DHCP configuration information.

Afterwards, step 502 may be repeatedly performed.

Step 509: The DHCP relay can be used to send a relay capability indication message to the IACP+DHCP server, and the relay capability indication message carries capability indication information and a network segment identifier.

It can be understood that, after the client computer with the official IP address is configured as an available DHCP repeater, the client computer with the official IP address is also an available DHCP repeater.

Step 510: After the judging device triggers the start of the DHCP server, the DHCP server assigns an official IP address to the client computer to be assigned an official IP address through an available DHCP repeater.

Specifically, since there is a DHCP repeater in the network system, IP addresses can be allocated according to a normal DHCP process.

Step 511 : After determining that the device triggers the start of the DHCP server, the DHCP server directly assigns an official IP address to the client to be configured with an official IP address.

Specifically, since the client computer to be assigned an IP address is in the same network segment as the DHCP server, the IP address can be assigned according to a normal DHCP process.

In the technical solution of this embodiment, by configuring the client with a formal IP address as a DHCP repeater, when DHCP is used to configure the IP address, there is no need to set a dedicated DHCP repeater in the network system to realize network investment and maintenance. cost reduction;

Further, this embodiment adopts the network segment identifier when making relevant judgments, which can be applicable to scenarios where the network system does not perform VLAN planning;

In addition, this embodiment carries the addresses of the IACP server and the DHCP server in the detection packet in the IACP process, which may be applicable to a scenario where the DHCP function and the IACP function are separately set in different physical entities.

FIG. 7 is a schematic flowchart of a method according to a fifth embodiment of the present invention. In this embodiment, VLAN planning is performed, and the IACP function and the DHCP function are set in the same physical entity as an example.

FIG. 8 is a schematic structural diagram of a network system corresponding to the fifth embodiment of the present invention. Referring to FIG. 8 , it includes at least one client 81. If there are multiple clients 81, it is assumed that they are divided into different VLANs. The client 81 communicates with an IACP+DHCP server 84 through an Ethernet (Ethernet) 82 and a router 83, and the IACP+DHCP server 84 may have IACP functions and DHCP functions. In this embodiment, a DHCP repeater needs to be configured in the VLAN of the network segment to which the client computer to be assigned a formal IP address belongs.

In this embodiment, unless otherwise specified, the VLAN refers to the VLAN of the network segment to which the client computer to which the official IP address belongs belongs.

Referring to Figure 7, this embodiment includes:

Step 701: After the IACP+DHCP server is started, determine whether the IACP+DHCP server and the client computer to be assigned a formal IP address belong to the same network segment, if so, go to step 711, otherwise, go to step 702.

Wherein, the relevant information of the client computer is stored in the IACP+DHCP server, and the relevant information includes the network segment identifier of the network segment to which the client computer belongs. Whether the clients are in the same network segment.

Step 702: The IACP+DHCP server judges whether there is an available DHCP repeater in the VLAN of the network segment to which the client to be assigned a formal IP address belongs. If yes, execute step 710; otherwise, execute step 703.

Specifically, a client computer with a formal IP address in the network system can send a relay capability indication message to the IACP+DHCP server, and the relay capability indication message carries a network segment identifier and a VLAN identifier (network segment identifier+VLAN identifier) and Capability indication information.

Therefore, the IACP+DHCP server can use the following method to judge whether there is an available DHCP repeater in the VLAN:

When the IACP+DHCP server receives the relay capability indication message sent by the client, the relay capability indication message carries capability indication information and network segment identifier+VLAN identifier, when the capability indication information indicates that the relay capability indication message is sent When the client has relay capability, and the network segment ID+VLAN ID indicates that the client sending the official IP address indication message is in the same VLAN as the client whose official IP address is to be configured, the IACP+DHCP server gets the VLAN There is an available DHCP repeater; it can be understood that the "available DHCP repeater" here may be a DHCP repeater configured by a client with a formal IP address, or may also be a DHCP repeater in the prior art Dedicated DHCP repeater.

When the IACP+DHCP server does not receive the relay capability indication message, or receives the relay capability indication message but the capability indication information indicates that the client sending the relay capability indication message does not have relay capability, or, When the relay capability indication message is received but the network segment identifier+VLAN identifier indicates that the client computer sending the official IP address instruction message is not in the same VLAN as the client computer whose official IP address is to be configured, the IACP+DHCP server obtains the There is no DHCP relay available within the VLAN.

Step 703: The IACP+DHCP server judges whether there is a client with a formal IP address in the VLAN, if yes, execute step 707, otherwise, execute step 704.

Specifically, after the client computer in the network system is started, the client computer that has been configured with a formal IP address (for example, using a manual configuration method or a DHCP configuration method) can send a formal IP address indication message to the IACP+DHCP server. The address indication message carries the network segment identifier+VLAN identifier.

Therefore, the IACP+DHCP server can use the following methods to judge whether there is a client with a formal IP address in the network segment:

When the IACP+DHCP server receives the formal IP address indication message carrying the network segment identifier+VLAN identifier sent by the client, and the network segment identifier+VLAN identifier indicates that the client computer sending the official IP address indication message is identical to the official IP address to be configured When the clients with the IP address are in the same VLAN, the IACP+DHCP server obtains that there is a client with a formal IP address configured in the VLAN;

When the IACP+DHCP server does not receive the official IP address indication message, or receives the official IP address indication message but the network segment identification+VLAN identification indicates that the client computer sending the official IP address indication message is not the same as the official IP address indication message to be configured. When the client computers with the IP addresses are not in the same VLAN, the IACP+DHCP server obtains that there is no client computer configured with a formal IP address in the VLAN.

Step 704: The IACP+DHCP server uses IACP to assign a temporary IP address to the temporary client in the VLAN.

Specifically, an implementation process similar to step 304 may be adopted, except that the network segment in step 304 needs to be replaced with the VLAN to which the client to be assigned a formal IP address belongs. Step 705: The temporary client obtains the official IP address from the IACP+DHCP server through the unicast DHCP process according to the temporary IP address in the detection packet, the gateway IP address, the netmask, and the IP address of the IACP+DHCP server.

Specifically, an implementation process similar to step 305 may be adopted, except that the network segment in step 305 needs to be replaced with the VLAN to which the client to be assigned a formal IP address belongs.

Step 706: The client with the official IP address sends an official IP address indication message to the IACP+DHCP server, and the official IP address indication message carries the network segment ID+VLAN ID.

Afterwards, step 703 may be repeatedly performed.

It can be understood that after the temporary client acquires the official IP address, the temporary client is also a client with the official IP address.

Step 707: Same as step 307.

Step 708: The client with the official IP address configures itself as an available DHCP repeater according to the DHCP configuration information.

Afterwards, step 702 may be repeatedly performed.

Step 709: The DHCP relay can be used to send a relay capability indication message to the IACP+DHCP server, and the relay capability indication message carries capability indication information and network segment ID+VLAN ID.

It can be understood that, after the client computer with the official IP address is configured as an available DHCP repeater, the client computer with the official IP address is also an available DHCP repeater.

Step 710: Same as step 310.

Step 711: The IACP+DHCP server directly assigns an official IP address to the client computer to be configured with an official IP address.

Specifically, since the client to be assigned an IP address is in the same VLAN on the same network segment as the IACP+DHCP server, the IP address can be assigned according to a normal DHCP process.

In the technical solution of this embodiment, by configuring the client with a formal IP address as a DHCP repeater, when DHCP is used to configure the IP address, there is no need to set a dedicated DHCP repeater in the network system to realize network investment and maintenance. cost reduction;

Further, this embodiment adopts the network segment identifier+VLAN identifier when making relevant judgments, which can be applied to the scenario where the network system performs VLAN planning;

In addition, this embodiment carries the address of the IACP+DHCP server in the detection packet in the IACP process, which is applicable to a scenario where the DHCP function and the IACP function are combined in the same physical entity.

FIG. 9 is a schematic flowchart of a method according to the sixth embodiment of the present invention. In this embodiment, VLAN planning is performed and the IACP function and the DHCP function are set in different physical entities as an example.

Fig. 10 is a schematic structural diagram of a network system corresponding to the sixth embodiment of the present invention. Referring to Fig. 10, it includes at least one client 101, and the client 101 communicates with the IACP server through an Ethernet (Ethernet) 102, or further through a gateway 103 104 communicates with a DHCP server 105, the IACP server 104 has an IACP function, and the DHCP server 105 has a DHCP function. In this embodiment, a DHCP repeater needs to be configured in the network segment to which the client computer to be assigned a formal IP address belongs.

In this embodiment, unless otherwise specified, the VLAN refers to the VLAN of the network segment to which the client computer to which the official IP address belongs belongs.

Referring to Figure 9, this embodiment includes:

Step 901: After the DHCP server is started, the judging device judges whether the DHCP server and the client to be assigned a formal IP address belong to the same network segment, if so, go to step 911, otherwise, go to step 902.

Wherein, the judging device is a functional module in the server device, and the judging device may be located in the IACP server, or located in the DHCP server, or independently set outside the IACP server and the DHCP server.

Wherein, the relevant information of the client computer is stored in the judging device, and the related information includes the network segment identifier of the network segment to which the client computer belongs, so the judging device can judge whether the DHCP server and the client computer to be assigned a formal IP address are in the same network. network segment.

Step 902: The judging device judges whether there is an available DHCP repeater in the VLAN of the network segment to which the client to be assigned an official IP address belongs. If yes, go to step 910; otherwise, go to step 903.

Specifically, a client with an official IP address in the network system may send a relay capability indication message to the judging device, where the relay capability indication message carries the network segment identifier+VLAN identifier and capability indication information.

Therefore, the judging device can use the following method to judge whether there is an available DHCP repeater in the network segment:

When the judging device receives the relay capability indication message sent by the client, the relay capability indication message carries the capability indication information and the network segment identifier+VLAN identifier, when the capability indication information indicates that the client sending the relay capability indication message With relay capability, and the network segment identifier + VLAN identifier indicates that the client sending the official IP address indication message is in the same VLAN as the client whose official IP address is to be configured, the judging device obtains that there is an available DHCP server in the VLAN. Repeater; It can be understood that the "available DHCP repeater" here can be a DHCP repeater configured by a client with a formal IP address, or it may be a dedicated DHCP repeater in the prior art. Repeater.

When the judging device does not receive the relay capability indication message, or receives the relay capability indication message but the capability indication information indicates that the client that sends the relay capability indication message does not have the relay capability, or receives When the relay capability indication message but the network segment ID+VLAN ID indicate that the client sending the official IP address indication message is not in the same VLAN as the client whose official IP address is to be configured, the judging device obtains that there is no Available DHCP repeater.

Step 903: The judging device judges whether there is a client with a formal IP address in the VLAN, if yes, go to step 907, otherwise, go to step 904.

Specifically, after the client in the network system is started, the client that has been configured with a formal IP address (for example, using manual configuration or DHCP configuration) can send a formal IP address indication message to the judging device, and the formal IP address indicates The message carries the network segment identifier + VLAN identifier.

Therefore, the judging device can use the following method to judge whether there is a client with a formal IP address in the network segment:

When the judging device receives the official IP address indication message carrying the network segment identifier+VLAN identifier sent by the client, and the network segment identifier+VLAN identifier indicates that the client computer sending the official IP address indication message is the same as the official IP address to be configured When the clients are in the same VLAN, the judging device obtains that there is a client configured with a formal IP address in the VLAN;

When the judging device does not receive the official IP address indication message, or, receives the official IP address indication message but the network segment identifier+VLAN identifier indicates that the client computer sending the official IP address indication message is not the same as the official IP address to be configured When the clients are not in the same VLAN, the judging device obtains that there is no client configured with a formal IP address in the VLAN.

Step 904: After the judging device triggers the start of the IACP server, the IACP server uses the IACP to assign a temporary IP address to the temporary client in the VLAN.

Specifically, an implementation process similar to step 504 may be adopted, except that the network segment in step 504 needs to be replaced with the VLAN to which the client to be assigned a formal IP address belongs.

Step 905: According to the temporary IP address in the detection packet, the IP address of the gateway, the network mask and the IP address of the DHCP server, the temporary client adopts the unicast DHCP process to obtain the official IP address from the DHCP server.

Specifically, an implementation process similar to step 505 may be adopted, except that the network segment in step 505 needs to be replaced with the VLAN to which the client to be assigned a formal IP address belongs.

Step 906: The client with the official IP address sends an official IP address indication message to the judging device, and the official IP address indication message carries a network segment identifier.

Afterwards, step 803 may be repeatedly performed.

It can be understood that after the temporary client acquires the official IP address, the temporary client is also a client with the official IP address.

Step 907: Same as step 507.

Step 908: The client with the official IP address configures itself as an available DHCP repeater according to the DHCP configuration information.

Afterwards, step 902 may be repeatedly performed.

Step 909: The DHCP relay can be used to send a relay capability indication message to the IACP+DHCP server, and the relay capability indication message carries capability indication information and network segment ID+VLAN ID.

It can be understood that, after the client computer with the official IP address is configured as an available DHCP repeater, the client computer with the official IP address is also an available DHCP repeater.

Step 910: Same as step 510.

Step 911: the IACP+DHCP server directly assigns a formal IP address to the client computer to be configured with a formal IP address.

Specifically, since the client to be assigned an IP address is in the same VLAN on the same network segment as the IACP+DHCP server, the IP address can be assigned according to a normal DHCP process. In the technical solution of this embodiment, by configuring the client with a formal IP address as a DHCP repeater, when DHCP is used to configure the IP address, there is no need to set a dedicated DHCP repeater in the network system to realize network investment and maintenance. cost reduction;

Further, this embodiment adopts the network segment identifier+VLAN identifier when making relevant judgments, which can be applied to the scenario where the network system performs VLAN planning;

In addition, this embodiment carries the addresses of the IACP server and the DHCP server in the detection packet in the IACP process, which may be applicable to a scenario where the DHCP function and the IACP function are separately set in different physical entities.

FIG. 11 is a schematic structural diagram of a server device according to a seventh embodiment of the present invention, including a client determining module 111 , a sending module 112 and an allocating module 113 .

The client computer determination module 111 is used to determine the client computer with the official IP address in the communication range to which the client computer with the official IP address belongs, and the official IP address is a configured IP address; the sending module 112 is used to send the client computer with the official IP address The client computer with the official IP address sends a relay configuration instruction message, which carries DHCP configuration information in the relay configuration instruction message; the distribution module 113 is used to send the client computer with the official IP address according to the DHCP configuration information. After the client computer configured as a DHCP repeater, the client computer to be configured with a formal IP address is assigned a formal IP address through the client computer configured as a DHCP repeater.

Further, this embodiment may further include a first judging module 114, and the first judging module 114 is used to judge whether there is a client configured with a formal IP address within the communication range;

Wherein, the client determining module 111 may include a first unit 1111 and/or a second unit 1112; the first unit 1111 is used to determine that there is an IP address configured with a formal IP address within the communication range when the first determining module 114 determines that the When the client computer, receive the official IP address indication message sent by the client computer that has been configured with the official IP address, and determine the client computer that sends the official IP address indication message as the client computer with the official IP address; the second unit 1112 is used to When there is no client computer configured with a formal IP address within the communication range, a temporary IP address is assigned, and the client computer assigned the temporary IP address is configured as a client computer with a formal IP address.

Specifically, the second unit 1112 may include an IACP unit 1113 and a DHCP unit 1114. The IACP unit 1113 is used to send a detection packet to the communication range, and the detection packet carries a temporary IP address, an IP address of a gateway in the communication range, a service The IP address of the end device and the network mask of the communication range, the temporary IP address is configured to the temporary client determined through negotiation with the clients within the communication range; the DHCP unit 1114 is used to receive the unicast DHCP sent by the temporary client request, and assign a formal IP address to the temporary client according to the unicast DHCP request, the temporary client after the formal IP address is assigned is determined to be a client with a formal IP address, correspondingly, the aforementioned unicast DHCP request is the The temporary client computer sends according to the temporary IP address, the IP address of the gateway of the communication range, the IP address of the server device and the network mask of the communication range.

Wherein, the IACP unit 1113 and the DHCP unit 1114 in this embodiment may be located in the same physical entity; at this time, the IP address of the server device sent by the IACP unit 1113 is the IP address of the physical entity. Alternatively, the IACP unit 1113 and the DHCP unit 1114 of this embodiment may also be located in different physical entities. At this time, the IP address of the server device sent by the IACP unit 1113 includes the IP address of the physical entity to which the IACP unit 1113 belongs. and the IP address of the physical entity to which the DHCP unit 1114 belongs.

Further, this embodiment may also include a second judging module 115, and the second judging module 115 is used to judge whether there is an available DHCP repeater within the communication range; the first judging module 114 is specifically used when the second judging module 114 When the module 115 determines that there is no available DHCP repeater within the communication range, it determines whether there is a client configured with a formal IP address within the communication range. Further, this embodiment may also include a third judging module 116, and the third judging module 116 is used to judge whether the server device and the client computer whose official IP address is to be configured are in the same network segment; the second judging module 115 is specifically used for judging whether there is an available DHCP relay within the communication range when the third judging module 116 judges that the server device and the client whose IP address is to be configured are not in the same network segment.

In this embodiment, by configuring the client with the official IP address as a DHCP repeater, when DHCP is used to configure the IP address, there is no need to set a dedicated DHCP repeater in the network system, thereby reducing network investment and maintenance costs; In this embodiment, the detection packet in the IACP process carries the addresses of the IACP unit and the physical entity to which the DHCP unit belongs, and may be applicable to a scenario where the DHCP function and the IACP function are combined in the same physical entity or separated in different physical entities.

FIG. 12 is a schematic structural diagram of a client computer according to the eighth embodiment of the present invention, including a receiving module 121 , a configuration module 122 and a relay module 123 .

The receiving module 121 is used to receive the relay configuration instruction message sent by the server device, and the relay configuration instruction message carries DHCP configuration information; the configuration module 122 is used to configure the machine as a DHCP repeater according to the DHCP configuration information; The relay module 123 is used to provide a DHCP relay function, so that the server device can assign a formal IP address to a client to be configured with a formal IP address.

Further, this embodiment may also include an address acquisition module 124 and an indication module 125, the address acquisition module 124 is used to acquire the official IP address; the indication module 125 is used to send the official IP address to the server device after acquiring the official IP address The indication message, correspondingly, the aforementioned relay configuration indication message is sent by the server device after receiving the official IP address indication message.

Wherein, the address acquisition module 124 may include a third unit 1241 and a fourth unit 1242, the third unit 1241 is used to receive the detection packet sent by the server device, the detection packet carries the temporary IP address, the gateway address of the communication range The IP address, the IP address of the server device and the netmask of the communication range; the fourth unit 1242 is used to base the temporary IP address, the IP address of the gateway of the communication range, the IP address of the server device and the network mask of the communication range Netmask, send a unicast DHCP request to the server device, and receive the official IP address assigned by the server device according to the unicast DHCP request.

Wherein, the client computer carries the network segment identifier, or the network segment identifier and the VLAN identifier when sending the relevant judgment information to the server. That is, when no VLAN is planned, what needs to be judged is: whether the client computer of this embodiment and the client computer whose official IP address is to be configured are in the same network segment; when planning a VLAN, what needs to be judged is: this implementation In this example, the client computer and the client computer whose official IP address is to be configured are in the same VLAN on the same network segment.

In this embodiment, by configuring the client with the official IP address as a DHCP repeater, when DHCP is used to configure the IP address, there is no need to set a dedicated DHCP repeater in the network system, thereby reducing network investment and maintenance costs; In this embodiment, a network segment identifier or a network segment identifier and a VLAN identifier are used in making relevant judgments, and may be applicable to scenarios where the network system does not perform VLAN planning or performs VLAN planning.

FIG. 13 is a schematic structural diagram of a communication system according to a ninth embodiment of the present invention, including a server device 131 and a client 132. The server device 131 may be as shown in FIG. 11 , and the client 132 may be as shown in FIG. 12 . In addition, for specific descriptions of the server device and the client, reference may be made to related device embodiments and/or method embodiments.

In addition, regarding the embodiment of the server device and the client computer, reference may also be made to the relevant method embodiment, that is, the device provided by the device embodiment can implement the procedures or functions in the method embodiment.

In this embodiment, by configuring the client with the official IP address as a DHCP repeater, when DHCP is used to configure the IP address, there is no need to set a dedicated DHCP repeater in the network system, thereby reducing network investment and maintenance costs; In this embodiment, a network segment identifier or a network segment identifier and a VLAN identifier are used in making relevant judgments, and may be applicable to scenarios where the network system does not perform VLAN planning or performs VLAN planning.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (22)

1. An automatic IP address configuration method is characterized by comprising the following steps:

the method comprises the steps that server side equipment determines a client with a formal IP address in a communication range where the client to be configured with the formal IP address belongs, wherein the formal IP address is a configured IP address;

the server-side equipment sends a relay configuration indication message to the client with the formal IP address, wherein the relay configuration indication message carries Dynamic Host Configuration Protocol (DHCP) configuration information;

after the client with the formal IP address configures the local machine into a DHCP repeater according to the DHCP configuration information, the server-side equipment allocates the formal IP address to the client to be configured with the formal IP address through the client configured into the DHCP repeater.

2. The method of claim 1, further comprising:

the server side equipment judges whether a client configured with a formal IP address exists in the communication range;

when the judgment result shows that the client configured with the formal IP address exists in the communication range, the server side equipment determines that the client with the formal IP address comprises the following steps:

the server equipment receives a formal IP address indication message sent by the client configured with the formal IP address, and determines the client sending the formal IP address indication message as a client with the formal IP address;

and/or the presence of a gas in the gas,

when the judgment result shows that the client configured with the formal IP address does not exist in the communication range, the step of determining the client with the formal IP address by the server equipment comprises the following steps:

the server device allocates a temporary IP address and configures a client allocated to the temporary IP address as a client having a formal IP address.

3. The method of claim 2, wherein the determining, by the server device, whether a client configured with a formal IP address exists in the communication range comprises:

when the server-side equipment receives a formal IP address indicating message which is sent by a client and carries communication range information, and the communication range information indicates that the client sending the formal IP address indicating message and the client to be configured with the formal IP address are in the same communication range, the server-side equipment judges that the client configured with the formal IP address exists in the communication range;

and/or the presence of a gas in the gas,

when the server-side equipment does not receive the formal IP address indication message, or the formal IP address indication message is received but the communication range information indicates that the client sending the formal IP address indication message and the client to be configured with the formal IP address are not in the same communication range, the server-side equipment judges that the client configured with the formal IP address does not exist in the communication range.

4. The method of claim 2, wherein the server device assigning a temporary IP address and configuring the client assigned to the temporary IP address as a client having a formal IP address comprises:

the server-side equipment sends a detection packet to the communication range, wherein the detection packet carries a temporary IP address, an IP address of a gateway of the communication range, an IP address of the server-side equipment and a network mask of the communication range, and the temporary IP address is configured to a temporary client determined by client negotiation in the communication range;

the server side equipment receives a unicast DHCP request sent by the temporary client, allocates a formal IP address to the temporary client according to the unicast DHCP request, and determines the temporary client after the formal IP address is allocated as a client with the formal IP address, wherein the unicast DHCP request is sent by the temporary client according to the temporary IP address, the IP address of the gateway in the communication range, the IP address of the server side equipment and the network mask in the communication range.

5. The method of claim 4,

when the server-side equipment comprises an automatic address allocation protocol (IACP) unit for allocating a temporary IP address and a Dynamic Host Configuration Protocol (DHCP) unit for allocating a formal IP address, and the IACP unit and the DHCP unit are positioned in the same physical entity, the IP address of the server-side equipment is the IP address of the physical entity;

or,

when the server-side device comprises an IACP unit for allocating a temporary IP address and a DHCP unit for allocating a formal IP address, and the IACP unit and the DHCP unit are located in different physical entities, the IP address of the server-side device comprises the IP address of the physical entity to which the IACP unit belongs and the IP address of the physical entity to which the DHCP unit belongs.

6. The method of claim 2, further comprising:

the server side equipment judges whether an available DHCP repeater exists in the communication range;

when the available DHCP repeater does not exist in the communication range, the server-side equipment performs the operation of judging whether a client configured with a formal IP address exists in the communication range.

7. The method of claim 6, wherein the determining, by the server device, whether there is a DHCP relay available in the communication range comprises:

when the server-side equipment receives a relay capacity indication message sent by a client, wherein the relay capacity indication message carries capacity indication information and communication range information, and when the capacity indication information indicates that the client sending the relay capacity indication message has relay capacity and the communication range information indicates that the client sending the relay capacity indication message and the client to be configured with a formal IP address are in the same communication range, the server-side equipment judges that an available DHCP (dynamic host configuration protocol) relay exists in the communication range;

and/or the presence of a gas in the gas,

when the server-side equipment does not receive the relay capability indication message, or the relay capability indication message is received but the capability indication message indicates that the client sending the relay capability indication message does not have the relay capability, or the relay capability indication message is received but the communication range information indicates that the client sending the relay capability indication message and the client to be configured with the formal IP address are not in the same communication range, the server-side equipment judges that no available DHCP repeater exists in the communication range.

8. The method of claim 6, further comprising:

the server side equipment judges whether the server side equipment and the client to be configured with the formal IP address are in the same network segment or not;

and when the server side equipment and the client to be configured with the IP address are not in the same network segment, the server side equipment executes the operation of judging whether an available DHCP repeater exists in the communication range.

9. The method according to claim 3 or 7,

when a virtual local area network VLAN is not planned, the communication range information is a network segment identifier of a network segment to which a client sending the communication range information belongs; and/or the presence of a gas in the gas,

when planning VLAN, the communication range information is the network segment identification of the network segment which the client sending the communication range information belongs to and the VLAN identification of the VLAN which the client belongs to.

10. An automatic IP address configuration method is characterized by comprising the following steps:

a client with a formal IP address receives a relay configuration indication message sent by a server device, wherein the relay configuration indication message carries Dynamic Host Configuration Protocol (DHCP) configuration information, and the client with the formal IP address and a client to be configured with the formal IP address are in the same communication range;

the client machine with the formal IP address configures the local machine into a DHCP repeater according to the DHCP configuration information;

and the client configured as the DHCP repeater provides a DHCP repeating function, and the server side equipment allocates a formal IP address to the client to be configured with the formal IP address.

11. The method of claim 10, further comprising:

before the client having the formal IP address has the formal IP address, the client also comprises a step of acquiring the formal IP address;

after acquiring a formal IP address, sending a formal IP address indication message to the server device, wherein the relay configuration indication message is sent by the server device after receiving the formal IP address indication message.

12. The method of claim 11, wherein the step of obtaining the formal IP address comprises:

the client receives a detection packet sent by the server device, wherein the detection packet carries a temporary IP address, an IP address of a gateway in the communication range, an IP address of the server device and a network mask in the communication range;

and the client sends a unicast DHCP request to the server equipment according to the temporary IP address, the IP address of the gateway in the communication range, the IP address of the server equipment and the network mask in the communication range, and receives a formal IP address distributed to the client by the server equipment according to the unicast DHCP request.

13. A server-side device, comprising:

the client determining module is used for determining the client with the formal IP address in the communication range of the client to be configured with the formal IP address, wherein the formal IP address is the configured IP address;

a sending module, configured to send a relay configuration indication message to the client having the formal IP address, where the relay configuration indication message carries dynamic host configuration protocol DHCP configuration information;

and the allocation module is used for allocating the formal IP address for the client to be configured with the formal IP address through the client configured as the DHCP repeater after the client with the formal IP address configures the local computer as the DHCP repeater according to the DHCP configuration information.

14. The apparatus of claim 13, further comprising:

the first judgment module is used for judging whether a client configured with a formal IP address exists in the communication range;

the client determination module includes: a first unit and/or a second unit;

the first unit is used for receiving a formal IP address indication message sent by the client with the configured formal IP address when the judgment result of the first judgment module is that the client with the configured formal IP address exists in the communication range, and determining the client sending the formal IP address indication message as the client with the formal IP address;

the second unit is configured to assign a temporary IP address when there is no client configured with a formal IP address in the communication range, and configure the client assigned to the temporary IP address as a client having a formal IP address.

15. The apparatus of claim 14, wherein the second unit comprises:

an automatic address assignment protocol (IACP) unit, configured to send a probe packet to the communication range, where the probe packet carries a temporary IP address, an IP address of a gateway of the communication range, an IP address of a server device, and a network mask of the communication range, and the temporary IP address is configured to a temporary client determined by client negotiation in the communication range;

and the DHCP unit is used for receiving a unicast DHCP request sent by the temporary client, allocating a formal IP address to the temporary client according to the unicast DHCP request, and determining the temporary client after the formal IP address is allocated as a client with the formal IP address, wherein the unicast DHCP request is sent by the temporary client according to the temporary IP address, the IP address of the gateway in the communication range, the IP address of the server-side equipment and the network mask in the communication range.

16. The apparatus of claim 15,

the IACP unit and the DHCP unit are positioned in the same physical entity; the IP address of the server-side equipment sent by the IACP unit is the IP address of the physical entity;

or,

the IACP unit and the DHCP unit are located in different physical entities; the IP address of the server device sent by the IACP unit includes the IP address of the physical entity to which the IACP unit belongs and the IP address of the physical entity to which the DHCP unit belongs.

17. The apparatus of claim 14, further comprising:

the second judgment module is used for judging whether an available DHCP repeater exists in the communication range;

the first determining module is specifically configured to determine whether a client configured with a formal IP address exists in the communication range when the second determining module determines that no available DHCP relay exists in the communication range.

18. The apparatus of claim 17, further comprising:

the third judging module is used for judging whether the server side equipment and the client to be configured with the formal IP address are in the same network segment;

the second judging module is specifically configured to judge whether an available DHCP relay exists in the communication range when the third judging module judges that the server device and the client to which the IP address is to be configured are not in the same network segment.

19. A client, comprising:

the receiving module is used for receiving a relay configuration indication message sent by the server equipment when the client has a formal IP address and is in the same communication range with the client to be configured with the formal IP address, wherein the relay configuration indication message carries Dynamic Host Configuration Protocol (DHCP) configuration information;

the configuration module is used for configuring the local machine into a DHCP repeater according to the DHCP configuration information;

and the relay module is used for providing a DHCP relay function and realizing that the server-side equipment allocates a formal IP address to the client to be configured with the formal IP address.

20. The client of claim 19, further comprising:

the address acquisition module is used for acquiring a formal IP address;

and the indicating module is used for sending a formal IP address indicating message to the server equipment after acquiring a formal IP address, and the relay configuration indicating message is sent after the server equipment receives the formal IP address indicating message.

21. The client of claim 20, wherein the address acquisition module comprises:

a third unit, configured to receive a probe packet sent by the server device, where the probe packet carries a temporary IP address, an IP address of a gateway in the communication range, an IP address of the server device, and a network mask in the communication range;

and a fourth unit, configured to send a unicast DHCP request to the server device according to the temporary IP address, the IP address of the gateway in the communication range, the IP address of the server device, and the network mask in the communication range, and receive a formal IP address allocated by the server device according to the unicast DHCP request.

22. A communication system, comprising:

the server device of any one of claims 13-18;

and the number of the first and second groups,

a client according to any one of claims 19 to 21.

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