CN102655473A - Communication method, equipment and system - Google Patents

Abstract

The invention relates to a communication method, equipment and system. The invention discloses a communication method in the technical field of communication, comprising: a gateway of a terminal equipment TE receives a message sent by TE; the gateway replies an address resolution protocol ARP response to the TE; wherein, if the purpose of the message is If the address is not the address of the gateway, the ARP response carries the destination address and the address of the port where the gateway is connected to the TE. The embodiment of the present invention also provides a communication device and a system. The embodiment of the present invention realizes that the TE can normally send data packets within the same network.

Description

A communication method, device and system

technical field

The present invention relates to the technical field of communication, in particular to a method, device and system for realizing TE communication within a network.

Background technique

In a Long Term Evolution (LTE) network, when a terminal equipment (Terminalequipment, TE) accesses other TEs or servers, the modem (Modem) can serve as a TE gateway to directly send data to other TEs or servers through the air interface.

The TE sends the data to the network side through the Modem. Since the network side does not send the subnet mask information of the destination to be accessed to the TE, the TE can only use the default subnet mask to send data. When the destination visited by the TE is in the same network as the TE, if there is no information about the destination in the address resolution protocol (ARP) cache of the TE, the TE will send an ARP broadcast message to request the next routing media Access control (Medium Access Control, MAC) address, the ARP broadcast message carries the IP address of the destination to be accessed by the TE, such as the IP address of the server in the same network as the TE. After the Modem receives the ARP broadcast packet, it will directly discard the ARP broadcast packet without performing other processing. Therefore, the TE cannot obtain the ARP information of the destination, and cannot send data to the destination in the same network through the Modem, resulting in communication interruption.

It can be seen that the Modem in the prior art is used as the gateway of the TE, and when the destination accessed by the TE is in the same network as the TE, communication will be interrupted.

Contents of the invention

Embodiments of the present invention provide a communication method, device and system, which can solve the problem in the prior art that the Modem is used as the gateway of the TE, and the communication interruption occurs when the destination visited by the TE is in the same network as the TE.

An aspect of the present invention provides a communication method, including:

The gateway of the terminal device TE receives the message sent by the TE;

The gateway replies an Address Resolution Protocol ARP response to the TE;

Wherein, if the destination address of the message is not the address of the gateway, the ARP response carries the destination address and the address of the port where the gateway is connected to the TE.

Another aspect of the invention provides apparatus comprising:

a receiving unit, configured to receive a message sent by the terminal equipment TE; and

a sending unit, configured to reply an Address Resolution Protocol ARP response to the TE; wherein, if the destination address of the message is not the address of the device, the ARP response carries the destination address and the address of the device and the device Address of the port to which the TE is connected.

Another aspect of the present invention provides a system, including a first device, the first device is configured to receive a message sent by a terminal device TE, and reply an Address Resolution Protocol ARP response to the TE; wherein, if the message If the destination address is not the address of the first device, the ARP response carries the destination address and the MAC address of the port where the first device is connected to the TE.

In the embodiment of the present invention, after the gateway of the TE receives the message sent by the TE, if the destination address of the above-mentioned message is not the address of the above-mentioned gateway, it can reply an ARP response to the TE, and the above-mentioned ARP response carries the above-mentioned destination address and the above-mentioned gateway If the address of the port connected to the TE is used, the TE can generate an ARP mapping table according to the ARP response, so that the TE can normally send data packets within the same network.

Description of drawings

FIG. 1 is a flowchart of a method for realizing communication of a terminal equipment TE within a network according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of the LTE network structure applied in the embodiment of the present invention;

FIG. 3 is a schematic diagram of a device structure for realizing communication of a terminal device TE within a network according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be understood that the described embodiments are only some of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The TE in this embodiment of the present invention may be any device on the terminal side of the network. For example, the TE includes but is not limited to a router, a personal computer, or a camera. The gateway of the TE is a wireless Modem device. The wireless Modem device can be located inside or integrated in the TE, such as a chip in the TE or a Modem in the TE (such as a unit with a Modem function in the TE), or it can be connected to the TE. Modem, such as a device located outside the TE and capable of wired or wireless communication with the TE. Taking the LTE system as an example, the TE gateway includes but is not limited to a chip in an LTE terminal or a Modem in an LTE terminal. Taking the LTE network structure shown in Figure 2 as an example, the TE on the terminal side is connected to the LTE Modem as the gateway of the TE, and can communicate with the evolved base station (eNodeB) on the access network side through the LTE Modem, and can further communicate with Core network side communication, such as SAE (System Architecture Evolution, system architecture evolution). It should be noted that the embodiments of the present invention are also applicable to systems such as LTE-A, and are not limited to LTE systems.

An embodiment of the present invention provides a communication method, as shown in FIG. 1 , including the following steps.

Step 10: The gateway of the TE receives the packet sent by the TE.

The message sent by the above TE is an ARP request message sent by TE before sending a data packet. Optionally, the message is an ARP broadcast message sent by TE. Before sending a data packet, TE determines that there is no destination in the ARP cache The message is sent in the case of ARP information. The ARP request message carries the IP address and MAC address of the TE, and the destination IP address.

Step 11: The gateway of the TE judges whether the destination IP address of the above message is its own IP address. For example, the gateway of the TE judges whether the destination IP address of the ARP request message is the same as the IP address of the gateway of the TE. If yes, go to step 13; otherwise, go to step 12.

Step 12: The gateway of the TE replies an ARP response to the above-mentioned TE, and the above-mentioned ARP response carries the above-mentioned destination IP address and the MAC address of the port connecting the above-mentioned gateway to the above-mentioned TE.

If the TE wants to access a server or other device on the same network as the TE, the TE does not search the routing table, and the destination IP address carried in the sent ARP request message is the IP address of the server or other device that the TE wants to access, while The IP address of the non-gateway. Then, the gateway can determine in step 11 that the destination IP address of the ARP request message is not the IP address of the gateway, and then the gateway can determine that the TE wants to access a server or other device on the same network as the TE. Therefore, the gateway in this step will not directly discard the ARP request packet, that is, it will not discard the ARP request packet sent by the TE when it wants to access a server or other device on the same network as the TE, but will carry the destination IP address and The ARP response of the MAC address of the gateway connected to the TE is sent to the TE, so that the TE can generate an ARP mapping table according to the ARP response, for example, the correspondence between the destination IP address and the MAC address of the port connected to the TE The relationship is saved to the ARP mapping table. Further, the TE may access the destination corresponding to the destination IP address according to the above correspondence in the ARP mapping table, and send a data packet to the destination. For a specific method of accessing the destination according to the correspondence, reference may be made to the prior art.

For example, in the LTE network structure shown in Figure 2, the Modem acts as the gateway of the TE. Suppose the IP address of the Modem is 172.21.104.1, and the MAC address of the port connecting the Modem to the TE is 0001. The TE wants to access other TEs or In the server, the destination IP address carried in the ARP request packet sent by the TE is 172.21.104.11. Then, after Modem determines that the destination IP address in the ARP request message received is not its own IP address, Modem sends an ARP response message to TE, which contains the MAC address (i.e. 0001) of the Modem and the address to be accessed in the response message. 172.21.104.11), so that the ARP table can be generated on the TE side according to the response message, as shown in Table 1.

IP ADDRESS MAC ADDRESS

172.21.104.11 0001

Table 1

Further, the TE may send the data packet to the destination IP address through the Modem according to the ARP table. For example, the data packet sent by the TE needs to be sent to the eNodeB through the air interface through the Modem, and then the eNodeB sends the above data packet to the core network, as shown in the SAE in Figure 2. It can be understood that the Modem, as a router connecting two access points, realizes, for example, the ARP spoofing function, so that the TE that initiates the ARP request mistakenly thinks that the Modem is the destination host, and sends the data packet sent to the destination host to the Modem, and the Modem sends the data packet to the modem through the air interface. The data packet received by the TE is sent to the destination host, thereby realizing the normal access operation of the TE in the same network.

Step 13: the gateway returns an ARP response to the TE, and the ARP response carries the IP address of the gateway and the MAC address of the port connecting the gateway to the TE.

Optionally, if the TE wants to access a server or other device on a different network from the TE, the TE searches the routing table and learns that the next hop is the gateway, and the destination IP address carried in the ARP request message sent by the TE is the gateway's IP address. Then, the gateway can determine in step 11 that the destination IP address of the ARP request message is the IP address of the gateway, and then the gateway can determine that the TE wants to access a server or other device in a different network from the TE. Therefore, the gateway in this step sends the ARP response carrying the IP address of the gateway and the MAC address of the port where the gateway is connected to the TE to the TE, so that the TE can generate an ARP mapping table according to the ARP response, for example, the The corresponding relationship between the IP address of the gateway and the MAC address of the port connecting the gateway to the TE is stored in the ARP mapping table. Further, the TE can access servers or other devices in different networks according to the above correspondence in the ARP mapping table, and for a specific method of accessing according to the correspondence, reference may be made to the prior art.

When it is determined that the destination IP address in the ARP request message is its own IP address, the Modem sends an ARP response message to the TE, which contains the Modem's IP (i.e. 172.21.104.1) and the Modem's MAC address (that is, 0001), the ARP table is generated on the TE side according to the response message, as shown in Table 2 below:

IP ADDRESS MAC ADDRESS 172.21.104.1 0001

Table 2

It should be noted that, in this embodiment, the IP address of the destination (ie, the destination IP address) is used as an example for the address of the destination to be accessed by the TE (ie, the destination IP address), and the IP address of the gateway is used as an example for the gateway address. The address of the port is described by taking the MAC address of the port as an example, but the above-mentioned addresses are not limited to the examples in this embodiment.

The method provided by the embodiment of the present invention is applicable to various application scenarios. Taking the first user equipment UE1 and the second user equipment UE2 as examples, it is assumed that UE1 includes a first terminal equipment TE1 and a first gateway Modem1 connected to TE1, and UE2 includes a second Two terminal equipment TE2 and the second gateway Modem2 connected to TE2, wherein:

The IP address of TE1 is 172.21.104.10; the SubMask (subnet mask) is 255.255.0.0; the MAC address of Modem1, the gateway of TE1, is 0001; the IP address of Modem1 is 172.21.104.1.

The IP address of TE2 is 172.21.104.11; the SubMask is 255.255.0.0; the MAC address of Modem2, the gateway of TE2, is 0002.

The IP address of the web server is 10.110.100.100; the SubMask Ip is 255.0.0.0;

In the example of the first application scenario, UE1 wants to visit UE2, and there is no information about TE2 in the ARP cache of TE1. Then, TE1 judges that TE2 and TE1 are in the same network segment (172.21.X.X) according to its own subnet mask 255.255.0.0, then TE1 does not check the routing table, because there is no information about TE2 in the ARP cache of TE1, so TE1 sends an ARP broadcast The message requests the MAC address, and the destination IP address carried in the ARP broadcast message is the IP address of TE2 (that is, 172.21.104.11). After Modem1 receives the ARP broadcast message, it judges the destination IP address in the ARP broadcast message Different from its own IP address, if it is determined that the destination device to be accessed by TE1 belongs to the same network as TE1, it will feed back an ARP response message to TE1, which contains the IP address 172.21.104.11 of TE2 and the MAC address 0001 of Modem1. ARP response, the generated ARP table is as follows Table 3:

IP ADDRESS MAC ADDRESS 172.21.104.11 0001

table 3

Further, TE1 sends a data packet to TE2 according to the ARP table. For the specific sending method, refer to the prior art. For example, the sent data packet carries the destination IP address 172.21.104.11 and the MAC address 0001 of Modem1, and Modem1 sends the data packet through the air interface to TE2.

In the second application scenario example, UE1 wants to access a web server, and there is no information about the web server in the ARP cache of TE1. Then, TE1 judges that the IP address 10.110.100.100 of the web server and its own IP address 172.21.104.10 belong to different networks according to its own subnet mask 255.255.0.0, then looks up the routing table and learns that the next-hop route is the gateway Modem1 of TE1. An ARP broadcast message is sent, carrying the IP address of Modem1. After receiving the ARP request message, Modem1 sends an ARP response to TE1, which carries Modem1's IP address 172.21.104.1 and Modem1's MAC address 0001. According to the ARP response fed back by Modem1, TE1 generates an ARP table as shown in Table 4:

IP ADDRESS MAC ADDRESS 172.21.104.1 0001

Table 4

Further, TE1 sends a data packet to the web server according to the ARP table. For the specific sending method, refer to the prior art. For example, the data packet sent carries the destination IP address 10.110.100.100 and the MAC address 0001 of Modem1, and Modem1 passes the data packet through the air interface sent to the web server.

The embodiment of the present invention realizes that after the gateway receives the message sent by the TE, if the destination IP address of the above message is not the IP address of the above gateway, the above gateway replies an ARP response to the TE, and the above ARP response carries the above destination IP address and the MAC address of the port connected to the gateway and the TE, the TE can generate an ARP mapping table according to the ARP response, so that the TE can normally send data packets within the same network.

The embodiment of the present invention also provides a device, which can realize the actions performed by the gateway in the communication method provided by the above embodiment, and is a device that can be used to realize the above method. For example, as shown in FIG. 3 , the device includes: a receiving unit 30 , a sending unit 31 , and may further include a judging unit 32 (not shown in the figure).

The receiving unit 30 receives the message sent by the TE; the sending unit 31 replies an ARP response to the TE; wherein, if the destination address of the message is not the device, the ARP response carries the destination address and the device and the TE The address of the connected port.

The judging unit 32 may judge whether the destination address of the message is the device before the sending unit 31 replies with an ARP response; Address and the ARP response of the address of the port where the above-mentioned equipment is connected to the above-mentioned TE; when the judgment result of the above-mentioned judging unit 32 is No, reply to the above-mentioned TE to carry the address of the above-mentioned equipment and the ARP of the address of the port that the above-mentioned equipment is connected to the above-mentioned TE response.

The above-mentioned device may be a wireless Modem, which may be located inside the TE or integrated in the TE, such as a chip in the TE or a Modem in the TE (such as a unit with a Modem function in the TE), or a Modem connected to the TE, For example, a device located outside the TE and capable of wired or wireless communication with the TE. Taking the LTE system as an example, the TE gateway includes but is not limited to a chip in an LTE terminal or a Modem in an LTE terminal. It can be understood that, in order to highlight the inventive points of the present invention, this embodiment omits the introduction of the existing functions of the device.

Optionally, the address of the above-mentioned device is the IP address of the above-mentioned device, and the address of the above-mentioned port is the MAC address of the port.

After the device provided by the embodiment of the present invention receives the message sent by the TE, if the destination address of the message is not the address of the device, it will not discard the message, but will reply an ARP response to the TE, and the above ARP response TE can generate an ARP mapping table according to the ARP response, so that the TE can normally send data packets within the same network.

An embodiment of the present invention also provides a system, and the system includes a first device. The first device can implement the actions performed by the gateway in the communication method provided in the above embodiment, and is a device that can be used to implement the above method. For example, the first device is used to receive the message sent by the TE, and reply an ARP response to the TE; wherein, if the destination address of the message is not the address of the first device, the ARP response carries the destination address and the The address of the port where the first device is connected to the TE. When the destination address of the message is the address of the first device, reply to the TE with an ARP response carrying the address of the first device and the address of the port where the first device is connected to the TE. Optionally, for the structure and function of the first device, reference may be made to the structure and function of the device provided in the foregoing embodiments, and details are not repeated here.

The first device may be a wireless Modem device, and the wireless Modem device may be located inside the TE or integrated in the TE, such as a chip in the TE or a Modem in the TE (such as a unit with a Modem function in the TE), or it may be connected to the TE The connected Modem is, for example, a device located outside the TE and capable of wired or wireless communication with the TE. Taking the LTE system as an example, the TE gateway includes but is not limited to a chip in an LTE terminal or a Modem in an LTE terminal.

Optionally, the address of the first device is the IP address of the first device, and the address of the port is the MAC address of the port.

Taking the address of the first device as the IP address of the first device and the address of the port as the MAC address of the port as an example, in the system provided by this embodiment, after the first device receives the message sent by the TE, if the purpose of the above message is The IP address is not the IP address of the above-mentioned first device, the message will not be discarded, but an ARP response is sent to TE, and the above-mentioned destination IP address carried in the above-mentioned ARP response and the MAC address of the port connected to the above-mentioned first device to the above-mentioned TE address, the TE can generate an ARP mapping table according to the ARP response, so this system realizes that the TE can normally send data packets within the same network.

The embodiment of the present invention improves the first device so that after receiving the message sent by the TE, it can be determined that the TE is visiting the same network when it is judged that the destination address of the message is not the address of the first device. Object, then reply an ARP response to TE, the above-mentioned ARP response carries the above-mentioned destination address and the address of the port where the above-mentioned first device is connected to the above-mentioned TE, then the TE can generate an ARP mapping table according to the ARP response, so as to realize that the TE is in the same network Data packets can be sent normally, that is, access within the same network can be performed normally.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory ( ROM for short), random access memory (RAM for short), magnetic disk, optical disk, etc.

For example, the embodiment of the present invention provides a communication method, which can be completed by instructing related hardware through a program. The method includes: the gateway of the terminal equipment TE receives the message sent by the TE; the gateway replies an Address Resolution Protocol ARP response to the TE; wherein, if the destination address of the message is not the address of the gateway, the The ARP response carries the destination address and the address of the port where the gateway is connected to the TE.

As another example, an embodiment of the present invention provides a chip, including a processor (processor), and optionally, the chip further includes a memory (memory). Wherein, the processor is used to receive a message sent by the terminal equipment TE, and is also used to reply an Address Resolution Protocol ARP response to the TE; wherein, if the destination address of the message is not the address of the chip, the ARP The response carries the destination address and the address of the port where the chip is connected to the TE.

Optionally, the processor is used to judge whether the destination address of the message is the address of the chip; when the judgment result of the judging unit is yes, reply to the TE carrying the destination address and the chip address An ARP response of the MAC address of the port connected to the TE. Optionally, when the judging result of the judging unit is negative, reply an ARP response carrying the address of the chip and the MAC address of the port connecting the chip to the TE to the TE.

Optionally, the chip is a chip for realizing the modem function of the wireless modem, and may be located inside the TE, or may be located in a device outside the TE, and connected to the TE.

Optionally, the destination address in this embodiment is the destination IP address, the chip address is the chip IP address, and the port address is the port MAC address.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed in the present invention can easily think of changes or Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (18)

1. A communication method, characterized in that, comprising: The gateway of the terminal device TE receives the message sent by the TE; The gateway replies an Address Resolution Protocol ARP response to the TE; Wherein, if the destination address of the message is not the address of the gateway, the ARP response carries the destination address and the address of the port where the gateway is connected to the TE. 2. The method of claim 1, further comprising: If the destination address of the message is the address of the gateway, the ARP response carries the address of the gateway and the address of the port where the gateway is connected to the TE. 3. The method according to claim 1, wherein before the gateway replies an ARP response to the TE, further comprising: Judging whether the destination address of the message is the address of the gateway. 4. The method according to claim 1, 2 or 3, wherein the message is an ARP broadcast message. 5. The method according to claim 1, 2 or 3, characterized in that the gateway is a wireless modem Modem. 6 . The method according to claim 5 , wherein the gateway is a chip in the terminal equipment TE for realizing the Modem function, or a Modem in the TE, or a Modem connected to the TE and located outside the TE. 7. The method according to claim 1, 2 or 3, wherein the destination address is a destination IP address, the address of the gateway is the IP address of the gateway, and the address of the port is the IP address of the port MAC address. 8. A device, characterized in that it comprises: a receiving unit, configured to receive a message sent by the terminal equipment TE; and a sending unit, configured to reply an Address Resolution Protocol ARP response to the TE; wherein, if the destination address of the message is not the address of the device, the ARP response carries the destination address and the address of the device and the device Address of the port to which the TE is connected. 9. The device of claim 8, further comprising: a judging unit, configured to judge whether the destination address of the message is the address of the device; The sending unit is specifically configured to, when the judging result of the judging unit is yes, reply to the TE with an ARP response carrying the destination address and the MAC address of the port where the device is connected to the TE. 10. The device according to claim 9, wherein the sending unit is further configured to, when the judging result of the judging unit is no, reply to the TE carrying the address of the device and the An ARP response of the MAC address of the port connected to the TE. 11. The device according to any one of claims 8 to 10, characterized in that the device is a wireless modem Modem. 12. The device according to claim 11, characterized in that, the device is a chip in the terminal equipment TE for implementing Modem functions, or a Modem in the TE, or a Modem connected to the TE and located outside the TE. 13. The device according to claim 8, 9 or 10, wherein the destination address is a destination IP address, the address of the device is the IP address of the device, and the address of the port is the MAC address. 14. A system, characterized by comprising a first device, the first device is configured to receive a message sent by a terminal device TE, and reply an Address Resolution Protocol ARP response to the TE; wherein, if the message If the destination address is not the address of the first device, the ARP response carries the destination address and the MAC address of the port where the first device is connected to the TE. 15. The system according to claim 14, wherein the first device is further configured to, when the destination address of the message is the address of the first device, reply to the TE carrying the An ARP response of the address of the first device and the MAC address of the port where the first device is connected to the TE. 16. The system according to claim 14 or 15, wherein the first device is a wireless modem Modem. 17 . The system according to claim 16 , wherein the first device is a chip in the terminal equipment TE for implementing Modem functions, or a Modem in the TE, or a Modem connected to the TE and located outside the TE. 18. The system according to claim 14 or 15, wherein the destination address is a destination IP address, the address of the first device is the IP address of the first device, and the address of the port is the IP address of the first device. MAC address of the port mentioned above.

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