CN102036422B - Method, device and system for acquiring IP address - Google Patents

Abstract

The invention discloses an IP address acquisition method, device and system, which are used to solve the problem of high failure rate of dual-stack terminal access services in the prior art. The main technical solutions include: requesting the network side to allocate the first type of Internet protocol IP address, and performing DNS resolution of the domain name server according to the first type of IP address allocated by the network side; after the DNS resolution fails or when the DNS resolution succeeds and the resolution results When the carried address does not match the IP address of the first type, the network side is requested to allocate the IP address of the second type. According to this technical solution, when the DNS resolution fails or the IP address obtained by the terminal does not match the address of its access service, the second type of IP address is further obtained, thereby avoiding the problem of the IP address type obtained by the terminal corresponding to the address type of its access service. The problem of service access failure caused by mismatch improves the success rate of dual-stack terminals to access services, and fully utilizes the dual-stack capabilities of dual-stack terminals.

Description

A method, device and system for obtaining an IP address

technical field

The present invention relates to the technical field of mobile communication, in particular to an IP address acquisition method, device and system.

Background technique

In the field of mobile communication, the number of terminals is increasing. Therefore, IPv4 addresses have gradually been unable to meet the needs of many terminals for IP (Internet Protocol, Internet Protocol) addresses. IPv6 has a wider address space than IPv4. Therefore, IPv6 is used in mobile The use in the field of communication holds a bright future.

Since the network scale based on IPv4 is quite large, and most applications are developed specifically for IPv4, the transition of communication networks to IPv6 will go through a long period, and IPv4 and IPv6 will coexist for a long period of time. In order to adapt to the transition period, more and more terminals can support IPv4 and IPv6 at the same time, and such terminals are called dual-stack terminals. At present, when a dual-stack terminal accesses Internet services through APN (Access PointName, access point name), as shown in Figure 1, perform the following steps:

Step 101, the terminal MS specifies that the PDP type is IPv4 or IPv6 according to the APN used, and sends a PDP (PacketData Protocol, data packet protocol) context activation request (Activate PDP Context Request) to the SGSN (Serving GPRS Support Node, serving GPRS support node) , the PDP context activation request includes the address type requested by the user;

Step 102, SGSN sends PDP context creation request (Create PDP ContextRequest) to GGSN (Gateway GPRS SupportNode, gateway GPRS support node) after passing MS authentication;

Step 103, GGSN feeds back the PDP context creation response (Create PDP ContextResponse) to SGSN, and includes the address (for IPv4 address or IPv6 address prefix) that user requests to obtain in this PDP context;

Step 104: The SGSN feeds back the PDP context activation acceptance (Activate PDP ContextAccept) to the MS.

If the PDP context received by the MS contains an IPv4 address, the terminal can directly perform DNS resolution based on the IPv4 address and access the service after the resolution is successful. If the PDP context received by the MS contains an IPv6 address prefix, the terminal also needs to receive The router announcement message sent by the GGSN contains an IPv6 address prefix, and an IPv6 address can be generated based on the IPv6 address prefix, and DNS resolution is performed according to the generated IPv6 address and the service is accessed after the resolution is successful. The GGSN sends it actively according to the timing mechanism, or it can send it based on the router request message of the MS.

Existing terminals can only obtain IPv4 addresses or IPv6 address prefixes through the above process. Usually, terminals only know the domain name of the service they want to access (such as www.abc.com) before accessing the service, and cannot determine the service server they want to access. Therefore, if the terminal obtains an IPv4 address through PDP activation, and the service it wants to access is an IPv6 service, when the terminal queries the IPv4 address of the service to be accessed through the DNS (Domain Name Server, domain name server) system, the DNS system Reply to the terminal with the information that the domain name to be accessed does not exist, resulting in failure of terminal service access, and vice versa.

To sum up, when existing dual-stack terminals access services, they can only obtain IPv4 addresses or IPv6 address prefixes without knowing the IP types supported by the services they want to access, resulting in a high failure rate for terminals accessing services. The dual-stack capability of the terminal has not been fully utilized.

Contents of the invention

In view of this, the embodiments of the present invention provide an IP address acquisition method, device and system, which are used to solve the problem of high failure rate of dual-stack terminal access services in the prior art.

Embodiments of the present invention are realized through the following technical solutions:

According to an aspect of the embodiments of the present invention, a method for obtaining an IP address is provided.

The method for obtaining an IP address according to an embodiment of the present invention includes:

Requesting the network side to allocate the first type of Internet protocol IP address, and performing domain name server DNS resolution according to the first type of IP address allocated by the network side;

After the DNS resolution fails or when the DNS resolution succeeds and the address carried in the resolution result does not match the IP address of the first type, request the network side to allocate the IP address of the second type.

According to another aspect of the embodiments of the present invention, a device for obtaining an IP address is also provided.

The device for obtaining an IP address according to an embodiment of the present invention includes:

The first communication unit is configured to request the network side to allocate a first type of Internet Protocol IP address, and receive the first type of IP address allocated by the network side;

A DNS resolution unit, configured to perform domain name server DNS resolution according to the first type of IP address received by the first communication unit;

The second communication unit is configured to request the network side to allocate a second type of IP after the DNS resolution unit fails to resolve or when the DNS resolution is successful and the address carried in the resolution result does not match the first type of IP address address.

According to another aspect of the embodiments of the present invention, an IP address acquisition system is also provided.

The IP address obtaining system provided according to the embodiment of the present invention includes:

The IP address allocation server is used to receive the terminal's Internet Protocol IP address allocation request, and allocate a corresponding type of IP address according to the IP address type specified in the request;

A terminal, configured to request the IP address allocation server to allocate a first type of IP address, and perform DNS resolution of a domain name server according to the first type of IP address allocated by the IP address allocation server; and, after DNS resolution fails or at When the DNS resolution is successful and the address carried in the resolution result does not match the IP address of the first type, requesting the IP address allocation server to allocate the IP address of the second type.

Through at least one of the above technical solutions provided by the embodiments of the present invention, the terminal first requests the network side to allocate the first type of IP address, performs DNS resolution according to the first type of IP address allocated by the network side, and after DNS resolution fails or in the DNS When the resolution is successful and the address carried in the resolution result does not match the IP address of the first type, the network side is requested to allocate the IP address of the second type. According to the technical solution provided by the embodiment of the present invention, when the DNS resolution fails or it is determined that the type of IP address obtained by the terminal does not match the type of address corresponding to the access service, the second type of IP address is further obtained, thereby avoiding the The problem of service access failure caused by the mismatch between the address type and the address type corresponding to the access service improves the success rate of dual-stack terminal access services.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is the flow chart of the terminal obtaining IP address provided by the background technology of the present invention;

Fig. 2 is the first flowchart of the method for acquiring an IP address and accessing services provided by an embodiment of the present invention;

FIG. 3 is a second flow chart of a method for obtaining an IP address and accessing services provided by an embodiment of the present invention;

FIG. 4 is a third flow chart of a method for obtaining an IP address and accessing services provided by an embodiment of the present invention;

FIG. 5 is a first schematic diagram of an IP address acquisition device provided by an embodiment of the present invention;

FIG. 6 is a second schematic diagram of an IP address obtaining device provided by an embodiment of the present invention;

FIG. 7 is a third schematic diagram of an IP address obtaining device provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of an IP address acquisition system provided by an embodiment of the present invention.

Detailed ways

In order to provide an implementation plan for improving the success rate of dual-stack terminal access services, embodiments of the present invention provide an IP address acquisition method, device, and system. The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings. It should be understood that, The preferred embodiments described here are only used to illustrate and explain the present invention, not to limit the present invention. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

According to an embodiment of the present invention, a method for obtaining an IP address and accessing services is provided, as shown in FIG. 2 , including:

Step 201, the dual-stack terminal requests the network side to allocate a first type of IP address.

In this step, the first type of IP address is determined to be preferentially obtained among the IPv4 address and the IPv6 address.

Step 202, receiving the first type of IP address allocated by the network side.

In this step, if what step 201 requests is the IPv4 address type, then the network side directly assigns an IPv4 address to the dual-stack terminal, and if what the step 201 requests is an IPv6 address type, then the network side assigns an IPv6 address prefix to the dual-stack terminal, The dual-stack terminal generates an IPv6 address for accessing services according to the IPv6 address prefix allocated by the network side.

Step 203, performing DNS resolution according to the first type of IP address allocated by the network side.

In this step, if the terminal requests the network side to allocate an IPv4 address in step 201, and it needs to obtain the IPv4 address of the service server to be accessed, it sends an address resolution request to the DNS system and requests the DNS to return the corresponding Class A address of the service server (i.e. IPv4 address), the request carries the domain name corresponding to the service server; if the terminal requests the network side to allocate an IPv6 address in step 201, it needs to obtain the IPv6 address of the service server to be accessed, and then sends an address resolution request to the DNS system, requesting DNS Return the AAAA address corresponding to the service server (that is, the IPv6 address), and the request carries the domain name corresponding to the service server.

Step 204 , judging whether the DNS resolution is successful and whether the address carried in the resolution result matches the first type of IP address if the resolution is successful, and if so, execute step 205 ; otherwise, execute step 206 .

In this step, if the service server requested by the DNS analysis terminal to access supports the address type requested by the terminal, then return the corresponding type of IP address to the terminal. If the IP addresses match, it is determined that the DNS resolution is successful; if the service server requested by the DNS resolution terminal does not support the address type requested by the terminal, a message that the domain name of the service server does not exist will be returned, and the terminal will determine that the DNS resolution has failed after receiving the message .

Step 205, accessing the service according to the IP address in the analysis result that matches the first type of IP address allocated by the network side.

Step 206, the dual-stack terminal requests the network side to allocate the second type of IP address.

In this step, if the first type of IP address determined to be preferentially obtained is an IPv4 address, then the second type of IP address is an IPv6 address; if the first type of IP address determined to be preferentially obtained is an IPv6 address, then the second type of IP address The IP address is an IPv4 address.

Step 207, receiving the second type of IP address allocated by the network side.

In the above step 201, the first type of IP address can be determined by the following strategy:

The dual-stack terminal can provide the user with a setting interface for the user to set the preferred address type among the IPv4 address and IPv6 address, and determine the preferred address type among the IPv4 address and IPv6 address set by the user as the first type of IP address; or,

The network side determines the preferred address type among the IPv4 address and IPv6 address, and sends it to the terminal by setting the communication method (such as short message), and the terminal uses the preferred address type among the IPv4 address and IPv6 address configured on the network side, determined to be an IP address of the first type; or,

When the terminal leaves the factory, one of the IPv4 address and the IPv6 address is the preferred address type to be obtained by default, that is, the first type of IP address.

According to the embodiment of the present invention, the priority acquisition policy can be flexibly set, and will not be listed here. Specifically, in setting, in order to improve the success rate of accessing services from IP addresses that are preferentially obtained, you can refer to the specific network environment to configure the type of IP addresses that are preferentially obtained. For example, it can be determined according to the proportion of IPv4 services and IPv6 services in the network. In the early stage of network transition to IPv6, services are still dominated by IPv4. Therefore, terminals can configure the preferred IP address type to be IPv4. In the later stages of network transition to IPv6, services may be dominated by IPv6. Therefore, terminals can configure The preferred IP address type is IPv6.

Further, in the embodiment of the present invention, the priority address type determined according to the above policy may also be adjusted, specifically as follows:

Determine the matching rate of the address carried in the resolution result of DNS analysis based on the first type of IP address assigned by the network side (that is, the IP address that is preferentially obtained) and the first type of IP address, when the matching rate is lower than the set When the threshold value (for example, 50%), the IP address of the second type is determined as the address type to be obtained preferentially. Wherein: the matching rate of DNS resolution=the number of matches between the DNS resolution result and the type of IP address obtained by the terminal/the total number of business visits.

In yet another embodiment of the present invention, after receiving the second type of IP address assigned by the network side in step 207, DNS analysis may be further performed on the second type of IP address to improve the success rate of service access and avoid Waste of network resources caused by address mismatch. Specifically as shown in Figure 3, it includes the following steps:

Step 301, perform DNS resolution according to the second type of IP address allocated by the network side.

In this step, the specific DNS resolution process is basically the same as the resolution process described in step 203 above, and will not be described in detail here.

Step 302 , judging whether the DNS resolution is successful and whether the address carried in the resolution result matches the second type of IP address if the resolution is successful, if so, execute step 303 , otherwise execute step 304 .

Step 303, accessing the service according to the IP address in the analysis result that matches the second type of IP address allocated by the network side.

Step 304, prompting that the terminal service cannot be accessed.

Considering the different working methods of the DNS system, the DNS system will return the corresponding IPv4 address and IPv6 address of the business server at the same time, or when the business server requested by the DNS analysis terminal does not support the address type requested by the terminal , will also return an IP address, which may be different from the type of address returned by the terminal requesting DNS. Therefore, according to the embodiment of the present invention, before executing step 301, that is, performing DNS resolution on the second type of IP address assigned by the network side , further perform the following steps:

Search for an address that matches the second type of IP address from the resolution result of DNS resolution based on the first type of IP address in step 203, if found, then access the service based on the found IP address without performing the above steps Steps 301 to 304, if not found, execute the above steps 301 to 304.

According to the embodiment of the present invention, before performing the above steps, it is necessary to configure the dual-stack terminal, specifically as follows:

In the existing dual-stack terminal, the APN of the terminal is bound to the available IP address types, that is, IPv4 APN and IPv6 APN. There is no APN that can use both IPv4 address types and IPv6 address types. Terminals can only apply for IPv4 addresses through IPv4 APN, and terminals can only apply for IPv6 addresses through IPv6 APN. The dual-stack APN is set through the embodiment of the present invention, so that the dual-stack terminal can apply for both an IPv4 address and an IPv6 address through the dual-stack APN. The specific setting methods of dual-stack APN include but not limited to the following methods:

Method 1: A new address type IPv4v6 that can be bound to a dual-stack APN. When a terminal obtains an address through this type of APN, it can apply for an IPv4 address or an IPv6 address.

Method 2: The APN is not bound to a specific address type, and no matter which type of address the terminal applies for, it can pass through the APN.

In order to better understand the embodiment of the present invention, the above technical solution of the embodiment of the present invention is described in more detail below by taking access to PS domain services as an example:

Assuming that the determined preferred address type (i.e. the first type of IP address) is IPv4, as shown in Figure 4, the following steps are specifically performed for obtaining the IP address and accessing the service:

Step 401, the dual-stack terminal activates PS domain services through the dual-stack APN, specifies the PDP type as IPv4, and sends a PDP context activation request to the network side.

Step 402: Receive the PDP context fed back by the network side after the dual-stack terminal passes the authentication, and the PDP context carries the IPv4 address allocated by the network side for the terminal.

Step 403, obtain the IPv4 address from the received PDP context, and perform DNS resolution according to the IPv4 address.

Step 404 , judging whether the parsing is successful and whether the address carried in the parsing result matches the IPv4 address if the parsing is successful, if yes, go to step 405 , otherwise go to step 406 .

Step 405, accessing the service through the IP address matching the obtained IPv4 address in the analysis result.

Step 406, the dual-stack terminal activates the PS domain service through the dual-stack APN, specifies the PDP type as IPv6, and sends a PDP context activation request to the network side.

Step 407: Receive the PDP context fed back by the network side after the dual-stack terminal passes the authentication, and the PDP context carries the IPv6 address prefix allocated by the network side for the terminal.

Step 408: Find whether there is an IPv6 address from the result of DNS resolution based on the IPv4 address.

Step 409 , judging whether an IPv6 address is found, if yes, execute step 410 , otherwise execute step 411 .

Step 410, accessing the service through the found IPv6 address.

Step 411, obtain the IPv6 address from the received PDP context, and perform DNS resolution according to the IPv6 address.

Step 412 , judging whether the parsing is successful and whether the address carried in the parsing result matches the IPv4 address if the parsing is successful, if so, go to step 413 , otherwise go to step 414 .

Step 413, accessing the service through the address matching the obtained IPv6 address in the analysis result.

Step 414, service access fails.

Corresponding to the above process, the embodiment of the present invention also provides an IP address acquisition device, as shown in Figure 5, the device includes:

The first communication unit 501, the DNS resolution unit 502, and the second communication unit 503; wherein:

The first communication unit 501 is configured to request the network side to allocate a first type of Internet Protocol IP address, and receive the first type of IP address allocated by the network side;

A DNS resolution unit 502, configured to perform domain name server DNS resolution according to the first type of IP address received by the first communication unit;

The second communication unit 503 is configured to request the network side to allocate a second type of IP address after the DNS resolution unit 502 fails to resolve or when the DNS resolution is successful and the address carried in the resolution result does not match the first type of IP address.

Further, as shown in FIG. 6, the device provided by the embodiment of the present invention may further include:

The preferentially obtained IP address determining unit 504 is configured to determine the preferentially obtained address type among the IPv4 address and IPv6 address set by the user as the first type of IP address before requesting the network side to allocate the first type of IP address; or, Determining the preferred address type among the IPv4 address and IPv6 address configured on the network side by setting the communication mode as the first type of IP address; or, determining the preferred address type among the default IPv4 address and IPv6 address as The first type of IP address.

More specifically, the above-mentioned priority acquisition IP address determination unit 504 is also used to:

Determine the matching rate of the address carried in the resolution result of DNS analysis based on the first type of IP address allocated by the network side and the first type of IP address, and when the matching rate is lower than the set threshold, the second type of IP address The address is determined to be the type of address to be obtained first.

Further, as shown in FIG. 7, the device provided by the embodiment of the present invention may further include: a service access unit 505; wherein:

The DNS resolution unit 502 is also used for: after receiving the second type of IP address assigned by the network side, perform DNS resolution according to the second type of IP address assigned by the network side; or, after receiving the second type of IP address assigned by the network side , searching for an address matching the second type of IP address from the result of DNS resolution based on the first type of IP address, if not found, performing DNS resolution according to the second type of IP address assigned by the network side;

The service access unit 505 is configured to access the service according to the address matching the second type of IP address in the resolution result when the DNS resolution unit 505 resolves successfully and the address carried in the resolution result matches the second type of IP address; or from When an address matching the second type of IP address is found in the result of DNS resolution based on the first type of IP address, the service is accessed according to the found IP address.

It should be understood that the functions implemented by the device for obtaining an IP address provided in this embodiment correspond one-to-one to the flow of the method for obtaining an IP provided in the above embodiment. For the more detailed processing flow implemented by each functional unit of the device, in the above method It has been described in detail in the embodiments, and will not be described in detail here.

Corresponding to the above process, the embodiment of the present invention also provides an IP address acquisition system, as shown in Figure 8, the system includes:

IP address assignment server 801 and terminal 802; Wherein:

The IP address assignment server 801 is configured to receive the IP address assignment request of the terminal, and assign a corresponding type of IP address according to the IP address type specified in the request;

The terminal 802 is used to request the IP address allocation server 801 to allocate the first type of IP address, and perform DNS analysis according to the first type of IP address allocated by the IP address allocation server 801; and, after the DNS analysis fails or after the DNS analysis succeeds And when the address carried in the analysis result does not match the IP address of the first type, request the IP address allocation server 801 to allocate the IP address of the second type.

Further, in the embodiment of the present invention, the above-mentioned terminal 802 is also used for:

Before requesting the IP address allocation server 801 to allocate the first type of IP address, determine the preferred address type among the IPv4 address and IPv6 address set by the user as the first type of IP address; The preferred address type among the IPv4 address and IPv6 address configured in the communication mode is determined as the first type of IP address; or, the preferred address type among the default IPv4 address and IPv6 address is determined as the first type of IP address .

Further, in the embodiment of the present invention, the above-mentioned terminal 802 is also used for:

Determine the matching rate of the address carried in the DNS analysis result of the first type of IP address assigned by the IP address allocation server 801 and the first type of IP address, and when the matching rate is lower than the set threshold, the The IP address of the second type is determined as the address type to be obtained preferentially.

Further, in the embodiment of the present invention, the above-mentioned terminal 802 is also used for:

After requesting the IP address allocation server 801 to allocate the second type of IP address, DNS resolution is performed according to the second type of IP address allocated by the IP address allocation server 801, after the resolution is successful and the address carried in the resolution result is the same as the second type of IP address When the IP address matches, access the service according to the address matching the second type of IP address in the analysis result; or,

After requesting the IP address allocation server 801 to allocate the second type of IP address, search for an address matching the second type of IP address from the resolution results of DNS analysis based on the first type of IP address, if found, then according to the search Otherwise, DNS resolution is performed according to the second type of IP address assigned by the IP address assignment server 801, and when the resolution is successful and the address carried in the resolution result matches the second type of IP address, according to the resolution Addresses matching the IP addresses of the second type in the result access services.

In practical applications, the above-mentioned IP address assignment server 801 may be a GGSN, or a PDN Gateway (Packet Data Network Gateway).

Through at least one of the above technical solutions provided by the embodiments of the present invention, the terminal first requests the network side to allocate a first type of Internet protocol IP address, performs DNS resolution according to the first type of IP address allocated by the network side, and after DNS resolution fails or When the DNS resolution is successful and the address carried in the resolution result does not match the IP address of the first type, the network side is requested to allocate the IP address of the second type. According to the technical solution provided by the embodiment of the present invention, when the DNS resolution fails or it is determined that the type of IP address obtained by the terminal does not match the type of address corresponding to the access service, the second type of IP address is further obtained, thereby avoiding the The problem of service access failure caused by the mismatch between the address type and the address type corresponding to the access service improves the success rate of dual-stack terminal access services.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (6)

1. An IP address acquisition method, comprising:

requesting a network side to distribute a first type of Internet Protocol (IP) address, and performing Domain Name Server (DNS) resolution according to the first type of IP address distributed by the network side;

requesting a network side to allocate an IP address of a second type after DNS analysis fails or when DNS analysis succeeds and an address carried in an analysis result is not matched with the IP address of the first type;

before requesting the network side to allocate the first type of IP address, the method further includes:

determining the address type which is preferentially acquired from the IPv4 address and the IPv6 address set by the user as an IP address of a first type; or,

determining an address type preferentially acquired from an IPv4 address and an IPv6 address configured by a network side through a set communication mode as an IP address of a first type; or,

determining the address type preferentially acquired from the default IPv4 address and the IPv6 address as an IP address of a first type;

the method further comprises the following steps:

determining the matching rate of an address carried in an analysis result of performing DNS analysis according to a first type of IP address distributed by a network side and the first type of IP address, and determining the second type of IP address as the address type acquired preferentially when the matching rate is lower than a set threshold value.

2. The method of claim 1, wherein after requesting the network side to assign the second type of IP address, further comprising:

performing DNS analysis according to a second type of IP address distributed by a network side, and accessing service according to an address matched with the second type of IP address in an analysis result when the analysis is successful and an address carried in the analysis result is matched with the second type of IP address; or,

searching an address matched with the second type of IP address from an analysis result of DNS analysis according to the first type of IP address, if the address is searched, accessing the service according to the searched IP address, otherwise, performing DNS analysis according to the second type of IP address distributed by the network side, and accessing the service according to the address matched with the second type of IP address in the analysis result when the analysis is successful and the address carried in the analysis result is matched with the second type of IP address.

3. An IP address acquisition apparatus, comprising:

the first communication unit is used for requesting the network side to distribute the first type of Internet protocol IP address and receiving the first type of IP address distributed by the network side;

the DNS analysis unit is used for carrying out domain name server DNS analysis according to the IP address of the first type received by the first communication unit;

the second communication unit is used for requesting the network side to allocate the IP address of the second type after the DNS analysis unit fails to analyze or when the DNS analysis is successful and the address carried in the analysis result is not matched with the IP address of the first type;

further comprising:

a priority acquisition IP address determining unit, configured to determine, as a first type IP address, an address type that is acquired preferentially from an IPv4 address and an IPv6 address set by a user before requesting a network side to allocate the first type IP address; or, the address type preferentially acquired from the IPv4 address and the IPv6 address configured by the network side through the set communication mode is determined as the IP address of the first type; or, determining the address type preferentially acquired from the default IPv4 address and the IPv6 address as the IP address of the first type;

the preferentially-acquiring IP address determining unit is further configured to:

determining the matching rate of an address carried in an analysis result of performing DNS analysis according to a first type of IP address distributed by a network side and the first type of IP address, and determining the second type of IP address as the address type acquired preferentially when the matching rate is lower than a set threshold value.

4. The apparatus of claim 3,

the DNS resolution unit is further configured to: after receiving the second type of IP address distributed by the network side, performing DNS analysis according to the second type of IP address distributed by the network side; or after receiving the second type of IP address distributed by the network side, searching an address matched with the second type of IP address from a resolution result of performing DNS resolution according to the first type of IP address, and if the address is not searched, performing DNS resolution according to the second type of IP address distributed by the network side;

the device further comprises: the service access unit is used for accessing services according to the address matched with the IP address of the second type in the resolution result when the DNS resolution unit successfully resolves the IP address of the second type and the address carried in the resolution result is matched with the IP address of the second type; or when the address matched with the IP address of the second type is found in the resolution result of the DNS resolution according to the IP address of the first type, accessing the service according to the found IP address.

5. An IP address acquisition system, comprising:

the IP address allocation server is used for receiving an Internet protocol IP address allocation request of the terminal and allocating IP addresses of corresponding types according to the IP address type appointed in the request;

the terminal is used for requesting the IP address allocation server to allocate the IP address of the first type and carrying out domain name server DNS analysis according to the IP address of the first type allocated by the IP address allocation server; and requesting the IP address allocation server to allocate a second type of IP address after DNS resolution fails or when DNS resolution succeeds and an address carried in a resolution result is not matched with the first type of IP address;

the terminal is further configured to:

before requesting the IP address distribution server to distribute the first type of IP address, determining the address type which is preferentially obtained from the IPv4 address and the IPv6 address set by the user as the first type of IP address; or, the address type preferentially acquired from the IPv4 address and the IPv6 address configured by the network side device through the set communication mode is determined as the IP address of the first type; or, determining the address type preferentially acquired from the default IPv4 address and the IPv6 address as the IP address of the first type;

the terminal is further configured to:

determining a matching rate of an address carried in an analysis result of performing DNS analysis according to the first type of IP address allocated by the IP address allocation server and the first type of IP address, and determining the second type of IP address as a preferentially acquired address type when the matching rate is lower than a set threshold value.

6. The system of claim 5, wherein the terminal is further configured to:

after requesting the IP address allocation server to allocate a second type of IP address, performing DNS analysis according to the second type of IP address allocated by the IP address allocation server, and when the analysis is successful and an address carried in an analysis result is matched with the second type of IP address, accessing a service according to the address matched with the second type of IP address in the analysis result; or,

after requesting the IP address allocation server to allocate a second type of IP address, searching an address matched with the second type of IP address from an analysis result of performing DNS analysis according to the first type of IP address, if so, accessing a service according to the searched IP address, otherwise, performing DNS analysis according to the second type of IP address allocated by the IP address allocation server, and accessing the service according to the address matched with the second type of IP address in the analysis result when the analysis is successful and the address carried in the analysis result is matched with the second type of IP address.