CN115086273A - NAT64 prefix distribution method and device of IPv6 single stack network and DNS64 equipment - Google Patents

NAT64 prefix distribution method and device of IPv6 single stack network and DNS64 equipment Download PDF

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Publication number
CN115086273A
CN115086273A CN202110279695.1A CN202110279695A CN115086273A CN 115086273 A CN115086273 A CN 115086273A CN 202110279695 A CN202110279695 A CN 202110279695A CN 115086273 A CN115086273 A CN 115086273A
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China
Prior art keywords
prefix
nat64
user terminal
server
record
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马晨昊
李聪
解冲锋
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2521—Translation architectures other than single NAT servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The disclosure discloses a NAT64 prefix distribution method and device of an IPv6 single-stack network and DNS64 equipment, and relates to the field of data communication. The method comprises the following steps: after performing domain name resolution on a domain name resolution request initiated by a user terminal, if a record A is inquired, acquiring at least one of a prefix of the user terminal and an IPv4 address of a server to be accessed; and allocating a NAT64 prefix to the user terminal according to at least one of the prefix of the user terminal and the IPv4 address of the server to be accessed so as to convert the A record into the AAAA record. The method and the device realize the conversion of the user traffic on the closer NAT64 equipment, can reduce the performance pressure of the NAT64 equipment, and reduce the transmission delay.

Description

NAT64 prefix distribution method and device of IPv6 single stack network and DNS64 equipment
Technical Field
The present disclosure relates to the field of data communications, and in particular, to a NAT64 prefix allocation method and apparatus for an IPv6 single stack network, and a DNS64 device.
Background
NAT (Network Address Translation) 64/DNS (Domain Name System) 64 is a single-stack technology of IPv6, and an IPv6 single-stack Network does not allocate an IPv4 Address to a user terminal any more, but allocates only an IPv6 Address. In the case of only an IPv6 address, access to IPv6 traffic and IPv4 traffic (IPv4aaS) is supported. Generally, a terminal initiates a domain name resolution request to a DNS64 server, if the DNS64 server queries an AAAA record, the record is directly returned to the terminal, and the terminal normally accesses an IPv6 application in the internet through an IPv6 network. If the DNS64 server inquires the A record, the DNS converts the NAT64 prefix (IPv 6 prefix routed to NAT64 equipment) and the A record into the AAAA record, and returns the converted AAAA record to the terminal. The IPv6 data flow of the terminal is routed to the NAT64 device, converted into the IPv4 data flow through the NAT64, and accessed to the IPv4 application in the Internet. However, in the prior art, a mechanism for allocating the NAT64 prefix to the user is lacked, which results in long transmission delay.
Disclosure of Invention
The technical problem to be solved by the present disclosure is to provide a NAT64 prefix allocation method and apparatus for an IPv6 single stack network, and a DNS64 device, which can reduce the performance pressure of the NAT64 device and reduce the transmission delay.
According to one aspect of the disclosure, a NAT64 prefix allocation method for an IPv6 single stack network is provided, including: after performing domain name resolution on a domain name resolution request initiated by a user terminal, if a record A is inquired, acquiring at least one of a prefix of the user terminal and an IPv4 address of a server to be accessed; and allocating a network address translation NAT64 prefix to the user terminal according to at least one of the prefix of the user terminal and the IPv4 address of the server to be accessed so as to convert the A record into the AAAA record.
In some embodiments, the NAT64 device is deployed on the user plane function UPF side of the user terminal in a distributed deployment manner.
In some embodiments, the user terminal is assigned a NAT64 prefix based on the priority of the user terminal.
In some embodiments, if servers to be accessed of a plurality of user terminals are the same, determining a corresponding NAT64 prefix according to an IPv4 address of the server to be accessed; and
and allocating the NAT64 prefix to the user terminal of the UPF where the NAT64 equipment corresponding to the NAT64 prefix is located.
In some embodiments, the correspondence between the prefix of the user terminal and the IPv4 address of the server and the NAT64 prefix is pre-stored.
According to another aspect of the present disclosure, a NAT64 prefix allocation apparatus for an IPv6 single stack network is further provided, including: the data acquisition unit is configured to perform domain name resolution on a domain name resolution request initiated by a user terminal, and acquire at least one of a prefix of the user terminal and an IPv4 address of a server to be accessed if a record A is inquired; and a prefix allocation unit configured to allocate a network address translation NAT64 prefix for the user terminal according to at least one of the prefix of the user terminal and the IPv4 address of the server to be accessed, so as to translate the a record into the AAAA record.
In some embodiments, the NAT64 device is deployed on the user plane function UPF side of the user terminal in a distributed deployment manner.
In some embodiments, the prefix allocation unit is further configured to allocate NAT64 prefixes to the user terminal according to the priority of the user terminal.
According to another aspect of the present disclosure, a NAT64 prefix allocation apparatus for an IPv6 single stack network is further provided, including: a memory; and a processor coupled to the memory, the processor configured to perform the NAT64 prefix assignment method described above based on the instructions stored in the memory.
According to another aspect of the present disclosure, there is also provided a domain name system DNS64 apparatus, comprising: NAT64 prefix assignment means described above.
According to another aspect of the present disclosure, a non-transitory computer-readable storage medium is also presented, having stored thereon computer program instructions, which when executed by a processor, implement the NAT64 prefix assignment method described above.
In the embodiment of the disclosure, before the DNS64 device converts the a record into the AAAA record, two filtering conditions, namely, the user prefix and the server IPv4 address, are configured according to actual situations, and the NAT64 prefix is allocated to the user terminal, so that the user traffic is converted on the closer NAT64 device, the performance pressure of the NAT64 device can be reduced, and the transmission delay can be reduced.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a flowchart illustrating some embodiments of a NAT64 prefix assignment method for an IPv6 single stack network according to the present disclosure.
Fig. 2 is a schematic deployment diagram of a NAT64 device according to the present disclosure.
Fig. 3 is a flowchart illustrating another embodiment of a NAT64 prefix assignment method for an IPv6 single stack network according to the present disclosure.
Fig. 4 is a schematic structural diagram of some embodiments of a NAT64 prefix assignment apparatus for an IPv6 single stack network according to the present disclosure.
Fig. 5 is a schematic structural diagram of another embodiment of a NAT64 prefix assignment device for an IPv6 single stack network according to the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
Fig. 1 is a flowchart illustrating some embodiments of a NAT64 prefix assignment method for an IPv6 single stack network according to the present disclosure. This embodiment is performed by a DNS64 device.
In step 110, after performing domain name resolution on the domain name resolution request initiated by the user terminal, if the record a is queried, at least one of the prefix of the user terminal and the IPv4 address of the server to be accessed is obtained.
In step 120, a NAT64 prefix is assigned to the user terminal according to at least one of the prefix of the user terminal and the IPv4 address of the server to be accessed, so as to convert the a record into an AAAA record.
In some embodiments, a NAT64 prefix assignment module is added to a DNS64 device, where the module prestores a prefix of a user terminal and an IPv4 address of a server, and corresponds to the NAT64 prefix, and after receiving a domain name resolution request initiated by the user terminal, the DNS64 device assigns a NAT64 prefix to the user terminal according to the prefix of the user terminal and the IPv4 address of a server to be accessed, if an a record is queried after resolving a domain name. As in table 1.
User prefix Server IPv4 address NAT64 prefix
prefixA x.x.x.x prefixa
prefixB y.y.y.y prefixb
prefixC z.z.z.z prefixc
。。。 。。。 。。。
In some embodiments, assuming that a user with a user prefix of X accesses a server IPv4 with an address of X _ IPv4, the DNS64 device performs the following algorithm.
if (prefix of X is prefix X or address of X access x.x.x.x.x)
Prefix of X is allocated
else if (prefix of X or address of X access y.y.y.y)
Prefix of X
。。。
。。。
。。。
else
Prefix _ all (default NAT64 server) for X
In the above embodiment, before the DNS64 device converts the a record into the AAAA record, two screening conditions, i.e., the user prefix and the server IPv4 address, are configured according to actual conditions, and the NAT64 prefix is allocated to the user terminal, so that the user traffic is converted on the closer NAT64 device, the performance pressure of the NAT64 device can be reduced, and the transmission delay is reduced.
In some embodiments of the present disclosure, as shown in fig. 2, the NAT64 device is deployed in a distributed manner, and is deployed on a UPF (User Plane Function) side of the User terminal. The DNS64 equipment distributes NAT64 prefix for the user terminal according to the prefix of the user terminal and the IPv4 address of the server to be accessed, so that the user traffic is converted on the closer NAT64 equipment, and the transmission delay is reduced.
In addition, if the NAT64 device adopts a centralized deployment manner, the DNS64 device issues the same NAT64 prefix for all users, so that the synthesized traffic is all collected on the centrally deployed NAT64 device, and a large pressure is applied to the NAT64 device. In this embodiment, the NAT64 device is deployed in a distributed manner, so that the performance pressure of the NAT device can be reduced.
In some embodiments, the UPF side of the user a sets a NAT device with a prefix a, the UPF side of the user B sets a NAT device with a prefix B, the user a wants to access a server with an IPv4 address of 1, the user B wants to access a server with an IPv4 address of 2, the server with an IPv4 address of 1 is closer to the NAT device with a prefix a, the server with an IPv4 address of 2 is closer to the NAT device with B prefix, the DNS64 allocates a NAT device prefix a to the user a, and the NAT device prefix allocated to the user B is B.
In some embodiments, if servers to be accessed of a plurality of user terminals are the same, determining a corresponding NAT64 prefix according to an IPv4 address of the server to be accessed; and distributing the NAT64 prefix to the user terminal of the UPF where the NAT64 equipment corresponding to the NAT64 prefix is located.
As shown in fig. 2, if a user a and a user B access the same server, the IPv4 address of the server is closer to the NAT64 device with prefix a, while the NAT64 device is deployed nearby on the UPF side of the user a, and when the DNS64 device allocates NAT64 prefixes to the user a and the user B, the NAT64 prefix a is allocated to the user a, and the prefix of the NAT device deployed nearby on the UPF side of the user B is newly selected and allocated to the user B. By uniformly scheduling NAT64 traffic, a NAT64 traffic path with low time delay can be provided for users.
In other embodiments of the present disclosure, the NAT64 prefix is assigned to the user terminal based on the priority of the user terminal. For example, if only one unallocated NAT64 prefix remains, but a plurality of users access the same server, and the server is the same distance from the NAT64 device on the UPF side of each user, the NAT64 prefix is allocated to the user with high priority.
Fig. 3 is a flowchart illustrating another embodiment of a NAT64 prefix assignment method for an IPv6 single stack network according to the present disclosure.
In step 310, the IPv6 terminal with prefix a initiates a domain name resolution request to the DNS64 device.
At step 320, the DNS64 device resolves the domain name.
In step 330, it is determined whether the record is an AAAA record according to the parsing result, if yes, step 340 is performed, otherwise, step 360 is performed.
At step 340, the DNS64 device returns an AAAA record to the terminal normally.
In step 350, the terminal routes the data packet to the application server.
In step 360, the DNS64 device assigns a NAT64 prefix to the terminal according to the terminal prefix and the IPv4 address of the application server, converts the a record into an AAAA record, and returns the AAAA record to the terminal.
In step 370, the terminal routes the data packet to the NAT64 device corresponding to the NAT64 prefix, and the data packet reaches the IPv4 application server after being translated by the address from IPv6 to IPv 4.
In the above embodiment, the prefix of the NAT64 is determined by the user prefix and the IPv4 address of the server, that is, different NAT64 prefixes are allocated to different users, so that the NAT64 traffic path with lower delay can be achieved.
Fig. 4 is a schematic structural diagram of some embodiments of the NAT64 prefix assignment apparatus for the IPv6 single stack network according to the present disclosure. The apparatus includes a data acquisition unit 410 and a prefix assignment unit 420.
The data obtaining unit 410 is configured to, after performing domain name resolution on a domain name resolution request initiated by a user terminal, obtain at least one of a prefix of the user terminal and an IPv4 address of a server to be accessed if an a record is queried.
The prefix assigning unit 420 is configured to assign a NAT64 prefix to the user terminal according to at least one of the prefix of the user terminal and the IPv4 address of the server to be accessed, so as to convert the a record into the AAAA record.
In some embodiments, the NAT64 device is deployed on the UPF side of the user terminal in a distributed manner. The DNS64 equipment distributes NAT64 prefix for the user terminal according to the prefix of the user terminal and the IPv4 address of the server to be accessed, so that the user traffic is converted on the closer NAT64 equipment, the transmission delay is reduced, and in addition, the NAT64 equipment adopts a distributed deployment mode, so that the performance pressure of the NAT equipment can be relieved.
In some embodiments, the prefix assignment unit 420 is further configured to assign NAT64 prefixes to the user terminals according to the priority of the user terminals.
In some embodiments, the prefix allocation unit 420 is further configured to pre-store a correspondence between the prefix of the user terminal and the IPv4 address of the server, and the NAT64 prefix.
In some embodiments, the prefix allocating unit 420 is further configured to determine, if servers to be accessed of the plurality of user terminals are the same, a corresponding NAT64 prefix according to the IPv4 address of the server to be accessed; and allocating the NAT64 prefix to the user terminal of the UPF where the NAT64 equipment corresponding to the NAT64 prefix is located.
In the above embodiment, before the DNS64 device converts the a record into the AAAA record, two screening conditions, i.e., the user prefix and the server IPv4 address, are configured according to actual situations, and the NAT64 prefix is allocated to the user terminal, which can reduce the performance pressure of the NAT64 device and reduce the transmission delay.
Fig. 5 is a schematic structural diagram of another embodiment of a NAT64 prefix assignment device for an IPv6 single stack network according to the present disclosure. The apparatus includes a memory 510 and a processor 520. Wherein: the memory 510 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory 510 is used for storing instructions in the embodiments corresponding to fig. 1 and 2. Processor 520 is coupled to memory 510 and may be implemented as one or more integrated circuits, such as a microprocessor or microcontroller. The processor 520 is configured to execute instructions stored in memory.
In some embodiments, processor 520 is coupled to memory 510 by a BUS BUS 530. The apparatus 500 may also be connected to an external storage system 550 through a storage interface 540 for calling external data, and may also be connected to a network or another computer system (not shown) through a network interface 560. And will not be described in detail herein.
In this embodiment, the data instructions are stored in the memory, and the processor processes the data instructions, so that the performance pressure of the NAT64 device can be reduced, and the transmission delay can be reduced.
In other embodiments of the present disclosure, a DNS64 device is protected, and the DNS64 device includes the NAT64 prefix assignment apparatus in the above embodiments.
In further embodiments, a computer-readable storage medium has stored thereon computer program instructions which, when executed by a processor, implement the steps of the method in the embodiments corresponding to fig. 1 and 2. As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Thus far, the present disclosure has been described in detail. Some details well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (11)

1. A NAT64 prefix distribution method of an IPv6 single stack network comprises the following steps:
after performing domain name resolution on a domain name resolution request initiated by a user terminal, if a record A is inquired, acquiring at least one of a prefix of the user terminal and an IPv4 address of a server to be accessed; and
and allocating a network address translation NAT64 prefix to the user terminal according to at least one of the prefix of the user terminal and the IPv4 address of the server to be accessed so as to convert the A record into an AAAA record.
2. The NAT64 prefix assignment method of claim 1, wherein,
the NAT64 device is deployed on the User Plane Function (UPF) side of the user terminal in a distributed deployment manner.
3. The NAT64 prefix assignment method of claim 1, further comprising:
and distributing NAT64 prefix to the user terminal according to the priority of the user terminal.
4. The NAT64 prefix allocation method of claim 2, wherein,
if the servers to be accessed of the user terminals are the same, determining the corresponding NAT64 prefix according to the IPv4 address of the server to be accessed; and
and distributing the NAT64 prefix to the user terminal of the UPF where the NAT64 equipment corresponding to the NAT64 prefix is located.
5. The NAT64 prefix allocation method of any one of claims 1 to 4,
the corresponding relation between the prefix of the user terminal and the IPv4 address of the server and the NAT64 prefix is preserved in advance.
6. A NAT64 prefix allocation device for an IPv6 single stack network, comprising:
the data acquisition unit is configured to perform domain name resolution on a domain name resolution request initiated by a user terminal, and acquire at least one of a prefix of the user terminal and an IPv4 address of a server to be accessed if a record A is inquired; and
a prefix allocation unit configured to allocate a network address translation NAT64 prefix to the user terminal according to at least one of the prefix of the user terminal and the IPv4 address of the server to be accessed, so as to translate the a record into an AAAA record.
7. The NAT64 prefix assignment device of claim 6,
the NAT64 device is deployed on the User Plane Function (UPF) side of the user terminal in a distributed deployment manner.
8. The NAT64 prefix assignment device of claim 6 or 7, wherein,
the prefix allocation unit is further configured to allocate a NAT64 prefix to the user terminal according to the priority of the user terminal.
9. A NAT64 prefix allocation device for an IPv6 single stack network, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the NAT64 prefix assignment method of any of claims 1-5 based on instructions stored in the memory.
10. A domain name system, DNS64, device, comprising:
the NAT64 prefix assignment arrangement of any one of claims 6 to 9.
11. A non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the NAT64 prefix allocation method of any one of claims 1 to 5.
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