CN101150502A - A NAT-PT device and its load share method - Google Patents

A NAT-PT device and its load share method Download PDF

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Publication number
CN101150502A
CN101150502A CN 200710124049 CN200710124049A CN101150502A CN 101150502 A CN101150502 A CN 101150502A CN 200710124049 CN200710124049 CN 200710124049 CN 200710124049 A CN200710124049 A CN 200710124049A CN 101150502 A CN101150502 A CN 101150502A
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China
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pt
nat
processing
ipv6
board
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CN 200710124049
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Chinese (zh)
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刘红祥
俊 姚
郭树波
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中兴通讯股份有限公司
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Publication of CN101150502A publication Critical patent/CN101150502A/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/25Network arrangements or network protocols for addressing or naming mapping of addresses of the same type; address translation
    • H04L61/2503Internet protocol [IP] address translation
    • H04L61/2507Internet protocol [IP] address translation translating between special types of IP addresses
    • H04L61/251Internet protocol [IP] address translation translating between special types of IP addresses between different IP versions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/12Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 characterised by the data terminal
    • H04L29/12009Arrangements for addressing and naming in data networks
    • H04L29/1233Mapping of addresses of the same type; Address translation
    • H04L29/12339Internet Protocol [IP] address translation
    • H04L29/12349Translating between special types of IP addresses
    • H04L29/12358Translating between special types of IP addresses between different IP versions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/12Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 characterised by the data terminal
    • H04L29/12009Arrangements for addressing and naming in data networks
    • H04L29/12047Directories; name-to-address mapping
    • H04L29/12056Directories; name-to-address mapping involving standard directories and standard directory access protocols
    • H04L29/12066Directories; name-to-address mapping involving standard directories and standard directory access protocols using Domain Name System [DNS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/15Directories; Name-to-address mapping
    • H04L61/1505Directories; Name-to-address mapping involving standard directories or standard directory access protocols
    • H04L61/1511Directories; Name-to-address mapping involving standard directories or standard directory access protocols using domain name system [DNS]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network-specific arrangements or communication protocols supporting networked applications
    • H04L67/10Network-specific arrangements or communication protocols supporting networked applications in which an application is distributed across nodes in the network
    • H04L67/1002Network-specific arrangements or communication protocols supporting networked applications in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers, e.g. load balancing

Abstract

The invention discloses a NAT-PT device and a related method for load sharing thereof, which includes the following steps: A. each NAT-PT processing single board is configured with different prefixes and address pool resources; B. a source terminal launches a domain name analysis process and transmits request messages to different single boards in a polling mode for processing, then transmits to destination terminals, and response packets are transmitted to the single boards for processing the request messages, then transmits to the source terminal; C. in a processing flow of service flow, IPv4 service messages are transmitted to the single boards configured with address pools containing destination IPv4 addresses for processing and IPv6 service messages are transmitted to the single boards matched with destination IPv6 address prefixes for processing. The invention is capable of completing decision-making on message NAT-PT processing and load sharing of messages simultaneously, thus avoiding the waste of computing resources. Furthermore, all single boards are configured with different address pool resources, NAT-PT mapping tables created in all single boards are mutually independent, and the same service flow is distributed to the same processing single board, thus avoiding the waste of storage resources.

Description

一种NAT-PT i更备及其负荷分担方法技术领域本发明涉及一种用于IPv6 (互联网协议版本6 )单协议网络和IPv4 (互联网协议版本4)单协议网络中终端通信的NAT-PT (Network Address Translation - Protocol Translation,网纟各;也址4争换-协i义转换)i殳备及其负荷分担方法。 One kind of NAT-PT i and more load balancing apparatus TECHNICAL FIELD The present invention relates to a method for IPv6 (Internet Protocol version 6) protocol networks and the IPv4 single (Internet Protocol version 4) NAT-PT single terminal in the network communication protocol (network address Translation - Protocol Translation, Si of each network; also access contention transducer 4 - Association sense conversion i) Preparation and i Shu load sharing method. 背景技术TCP/IP协议簇的成功使用,使得通信技术得到迅猛的发展和广泛应用,作为网络技术的核心协议的IPv4协议,由于受到32位地址长度的限制,面临地址分配即将耗尽、难以扩展的问题。 BACKGROUND successful use of TCP / IP protocol suite that communications technology has been the rapid development and wide application, as the IPv4 protocol core network protocol technology, due to the limitations of 32-bit address length, faced address assignment is running out, difficult to expand The problem. 为克力l现有IPv4协议簇的局限性,具有无限地址资源和良好扩展性的IPv6协议被提出, 并已经开始应用。 IPv6 protocol limitations l gf existing IPv4 protocol suite, with unlimited resources and good scalability addresses have been proposed, and has begun to apply. 但IPv4向IPv6的过渡会经历一段相当的时间,过渡期间实现IPv4单协议网络域和IPv6单协议网络域中各种设备之间的通信,需要在IPv4网络和IPv6网络的边界路由器上完成IPv4报文和IPv6 报文的相互转换,具有此功能的路由器也称为NAT-PT网关,用于实现IPv4单协议域和IPv6单协议域终端之间的通信。 But the transition from IPv4 to IPv6 will experience a considerable period of time, to achieve a single protocol IPv4 and IPv6 network domains during the transition single domain network protocol for communication between devices, complete the report on the IPv4 border router IPv4 and IPv6 networks of all kinds routers above and conversion of the IPv6 packet, with this function is also called NAT-PT gateway for communication between the IPv4 and IPv6 protocol field of single-domain single-protocol terminal. 另一方面,迅速增加的用户数量和业务对数据业务的带宽要求不断提高,为满足不断扩容的需求,目前的通信设备多数采用分布式的系统架构, 一般都是由接口单板、控制面处理单板和数据处理单板构成。 On the other hand, the rapid increase in the number of users and service bandwidth requirements of the data traffic continues to increase, expansion to meet demand, the majority of current communication device using a distributed system architecture, generally by the interface board, the control plane processing data processing boards and one board. 其中接口单板负责从外部端口接收报文、分离控制信令和用户数据,并分别分发到控制面处理单板和数据处理单板处理;同时接收来自控制面处理单板或数据处理单板的报文,通过接口向外发送。 Wherein the interface board is responsible for packets received from an external, separate control signaling and user data, and are distributed to the control plane processing and data processing board processing board; control plane processing simultaneously receives from the data processing board or board message, sent out through the interface. 由于分布式设备中存在多个处理单板,如何实现多个处理单板之间的负荷分担(或称负载均衡)是系统设计的一个非常重要的方面。 Because there are multiple devices in a distributed processing boards, how to achieve load sharing between a plurality of processing boards (also known as load balancing) is a very important aspect of system design. 对分布式NAT-PT设备而言, 负荷分担主要指的是如下两个方面:1)如何分发需要—故NAT-PT的报文到多个NAT-PT处理单板进行NAT-PT处理;2 ) NAT-PT设备配置的地址池资源、净艮文转换使用的地址映射表如何在多个NAT-PT处理单4反上均衡分配。 For distributed NAT-PT device, load sharing mainly refers to the following two aspects: 1) how to distribute the required - so NAT-PT packets to the plurality of NAT-PT NAT-PT single board processing process; 2 ) address pool resource allocation NAT-PT device, net Gen text conversion using the address mapping table on how to handle a single balanced trans 4 partitioned plurality NAT-PT. 现有技术中,分布式NAT-PT设备中报文处理的负荷分担一般使用分布式网络设备中通用的负荷分担方案:首先由报文首部信息提取单元提取IP报文的头部信息如源IP、目的IP、协议类型、4层端口号信息等,然后分发单元将这些信息按照某种规则构造为决策和分发索引关键字,接下来对索引关键字进行散列操作或是模余操作,从而将报文分发到不同的处理单板处理。 In the prior art, the load distributed NAT-PT device sharing packet processing device is generally used in a distributed network load sharing common scheme: header information of the first IP packet header extracted by the packet information extracting unit such as a source IP an object of the IP, protocol type, layer 4 port number information, and the information distribution unit configured according to certain rules for decision-making and distribution of the index key, the next key index I hashing or molding operation so that the packets distributed to different processing board processing. 附图1所示为使用此技术方案实现分布式NAT-PT设备负荷分担的原理示意图,这种使用报文首部中多个字段构成的索引关键字通过散列或是模余操作进行报文分发的方法,存在如下的问题:1、构造索引关键字的多个字段中只要有一个字段改变,报文便会被分发到不同的NAT-PT处理单板,这样对于同一个用户或是同一个业务流中的报文会被分发到不同的NAT-PT处理单板,这要求所有的NAT-PT单板都必须驻留全部的地址池资源,进而可能生成全部一致的映射表条目,从而造成各处理单板存储资源的浪费,某些情况下甚至是难 Figure 1 shows the principle used to achieve this aspect of the distributed load balancing NAT-PT device schematic, this index key using the packet header field is composed of a plurality of packets for distribution by hashing operation or mode I method, the following problems: 1, the plurality of fields as long as the configuration of the index keys in a field changes, the message will be distributed to different NAT-PT processing board, so that for the same user or the same packet traffic flow will be distributed to different NAT-PT processing board, which requires that all NAT-PT board must reside full address pool resources, which may generate all the same mapping table entries, resulting in each waste processing board storage resources, and in some cases even difficult

以实现的;2、使用IP报文首部的多个字段构造索引关键字,尤其是对IPv6 报文而言,索引长度过长,散列操作需要较多的计算资源,尤其是软件实现时,性能受到限制。 To achieve; 2, constructed using multiple fields index key IP packet header, especially for IPv6 packets, the index is too long, the hash operation requires more computing resources, especially when implemented in software, performance is limited. 发明内容本发明所要解决的技术问题是提供一种NAT-PT设备及其负荷分担方法,有效降低各处理单板的负荷,并避免存储资源的浪费。 SUMMARY OF THE INVENTION The technical problem to be solved is to provide a NAT-PT device and a method for load sharing, reduce processing load of each board, and to avoid the waste of storage resources. 为解决上述技术问题,本发明是通过以下技术方案实现的:一种NAT-PT设备的负荷分担方法,所述方法包括以下步骤:A、 为各个NAT-PT处理单板配置不同的NAT-PT IPv6前缀和地址池资源;B、 源终端发起域名解析流程,将域名解析请求报文轮询发送到不同NAT-PT处理单板进行处理,处理完后发送至目的终端,目的终端返回域名解析响应才艮文后,将该报文发送至处理其请求报文的NAT-PT处理单板进行处理,处理完后发送至源终端;C、 进入源终端与目的终端之间的业务流处理流程,将IPv4业务报文发送至包含其目的IPv4地址的地址池所属的NAT-PT处理单板进行处理,将IPv6业劣理单板进行处理。 To solve the above problems, the present invention is achieved by the following technical solution: A method for load sharing NAT-PT device, the method comprising the steps of: A, NAT-PT different configuration for each processing board NAT-PT IPv6 prefix and the address resource pool; B, domain name resolution process initiated by the source terminal, the domain name resolution request poll message sent to a different NAT-PT processing board for processing, after processing is transmitted to the destination terminal, the destination terminal returns the domain name resolution response Gen text only later, the message which is sent to the processing request packets NAT-PT process board is processed, after the processing to the transmission source terminal; C, the traffic entering the process flow between the source terminal and the destination terminal, the NAT-PT service IPv4 packet to the IPv4 address of an object comprising an address pool belonging to the processing board for processing, the IPv6 inferior processing board for processing industry. 其中,所述源终端为IPv4终端,所述目的终端为IPv6终端;或者: 所述源终端为IPv6终端,所述目的终端为IPv4终端。 Wherein the IPv4 terminal is a source terminal, the destination terminal is a terminal IPv6; or: the source terminal of the IPv6 terminal, the IPv4 terminal to the destination terminal.

其中,所述步骤A中为每个NAT-PT处理单板配置一个NAT-PT IPv6 前缀和一个地址池,同时步骤C中对业务才艮文进行NAT-PT处理。 Wherein the step A for each processing board configuration NAT-PT NAT-PT a and a prefix of the IPv6 address pool business Step C was performed NAT-PT Gen packet processing. 其中,所述步骤A中为每个NAT-PT处理单板配置两个NAT-PT IPv6 前缀,并将其地址池划分为包含端口号的和不包含端口号的两部分,分别与所述两个前缀对应。 Wherein, in the step A is treated each NAT-PT NAT-PT two board configuration the IPv6 prefix and the address is divided into pools containing the port number and the port number does not include two parts, with the two prefix correspond. 其中,所述步骤B中,NAT-PT处理单板对所述域名解析请求净艮文及其响应报文的处理包括NAT-PT处理和域名解析处理。 Wherein, the step B, NAT-PT board processing the domain name resolution request packets and response process net Gen packets include NAT-PT and DNS processing process. 其中,所迷步骤C中,对于IPv4报文,若与其目的IPv4地址匹配的地址池不包括端口号,则NAT-PT处理单板对其进行NAT-PT处理, 否则进4亍NAPT-PT ( Network Address Port Translation誦Protocol Translation:网络地址端口转换-协议转换)处理;对于IPv6报文,若与其匹配的前缀所对应的地址池不包括端口号,则对其进行NAT-PT处理,否则进行NAPT-PT处理。 Wherein, in step C, the fans, for the IPv4 packet, if its address matches the destination IPv4 address pool does not include the port number, the NAT-PT NAT-PT processing board subjected to processing, or into the right foot 4 NAPT-PT ( chant network address port Translation protocol Translation: network address port Translation - protocol Translation) processing; for the IPv6 packet, when its matching prefix corresponding to an address pool does not include the port number, NAT-PT is subjected to treatment, or for NAPT -PT process. 一种NAT-PT设备,所述设备包括互连的接口单板和NAT-PT处理单板,所述接口单板包括互连的接口单元和决策分发单元,所述NAT-PT 处理单纟反包括互连的NAT-PT处理单元和资源管理单元;所述接口单元用于接收和发送IPv4和IPv6报文;板;判断与业务报文的目的IPv6地址前缀或目的IPv4地址相匹配的NAT-PT处理单板,将业务报文分发至与其相匹配的NAT-PT处理单板; 所述NAT-PT处理单元用于对报文进行处理; 所述资源管理单元用于管理NAT-PT处理单板的地址池、端口和NAT-PT IPv6前缀资源。 One kind of NAT-PT device, the device comprises an interconnect interface boards and NAT-PT processing board, said interface board comprising an interface unit and interconnected decision distribution unit, the processing unit NAT-PT Si trans comprising a processing unit and NAT-PT interconnect resource management unit; said interface unit for sending and receiving IPv4 packets and IPv6; plate; IPv6 prefix object or destination IPv4 address and service packet is determined to match the NAT- PT board process, to distribute the service packet processing board NAT-PT matched thereto; NAT-PT said processing unit configured to process the packet; the resource management unit for managing processing unit NAT-PT address pool plate, and port NAT-PT IPv6 prefix resources. 其中,所述NAT-PT处理单元对域名解析报文进行NAT-PT处理和域名解析处理,根据报文的前缀或其目的地址所属地址池对业务报文进4亍NAT-PT处理或NAPT-PT处理。 Wherein said processing unit NAT-PT DNS packets NAT-PT and DNS processing process based on the packet prefix or a destination address belongs to the address pool service packet into the right foot 4 or NAT-PT treated NAPT- PT treatment. 其中,所述NAT-PT处理单板还包括存储单元,用于存储NAT-PT 处理单板的地址池、端口和NAT-PT IPv6前缀资源。 Wherein the NAT-PT processing board further includes a storage unit for storing processing board NAT-PT address pool, port NAT-PT and the IPv6 prefix resources. 其中,所述设备还包括控制面处理单元和路由转发引擎单元,其中, 所述控制面处理单元用于处理进入设备的控制面命令和报文; 所述路由转发引擎单元用于完成报文的路由转发。 Wherein said apparatus further comprises a processing unit and a control plane routing forwarding engine unit, wherein the control plane processing unit into the apparatus for processing the command and control plane packet; forwarding the routing engine unit for performing packet routing forwarding. 本发明具有以下有益效果:本发明通过^#个NAT - PT处理单板配置前缀和地址池资源,对报文是否做NAT - PT的决策和报文的负荷分担同时完成,对于IPv6到IPv4的才艮文,决策和负荷分担只4吏用目的V6地址的高96位直接匹配各NAT-PT处理单板配置的前缀,避免了计算资源的浪费;对于IPv4 到IPv6的^J艮文,决策和负荷分担^使用目的IPv4地址和单板配置的地址池匹配来实现;另一方面,同一业务流被分发同一个处理单板,由于各单板地址池资源不同,各单板上生成的NAT-PT映射表相互独立,避免了存储资源的浪费。 The present invention has the following advantages: the present invention, by a ^ # NAT - PT and processing board configuration prefix address pool resources, whether the packet is done NAT - decisions and packet PT is load balancing done simultaneously for IPv6 to IPv4 Gen only text, only four load sharing decisions, and with the purpose of high officials V6 address prefix 96 of each NAT-PT direct matching processing board configured to avoid the waste of computing resources; for IPv4 to IPv6 ^ J Gen text, decision and the use of load sharing ^ destination IPv4 address matches the address pool and configured to implement the board; on the other hand, the same traffic flow is distributed with a processing board, the board due to the different address pools for each resource, each of the board generated NAT -PT mapping table independent of each other, avoiding the waste of storage resources. 附图说明图1为现有分布式NAT-PT设备负荷分担原理示意图; 图2为本发明NAT-PT设备的负荷分担方法流程图;图3为实施例一的负荷分担方法原理示意图;图4为实施例一的决策和分发方法流程图;图5为实施例一的NAT-PT单板处理方法流程图;图6为本发明的分布式NAT-PT设备结构图。 BRIEF DESCRIPTION OF balancing is a schematic diagram a conventional distributed load NAT-PT device; FIG. 2 NAT-PT load sharing method of the present invention, a flow chart of the device; FIG. 3 is a method of load sharing a simplified schematic of the embodiment; FIG. 4 the method of making and distributing embodiment is a flowchart of embodiment; FIG. 5 is a flowchart NAT-PT board processing method according to one embodiment; FIG. 6 distributed NAT-PT device structure of the present invention, FIG. 具体实施方式下面结合附图和具体实施例对本发明作进一步详细的描述:本发明提供了一种NAT-PT设备的负荷分担方法,如图2所示,包括以下步骤:201 、为各个NAT-PT处理单板配置不同的NAT-PT IPv6前缀和地址池资源;202、 源终端发起DNS (域名解析)流程,将DNS请求报文轮询发送到不同NAT-PT处理单板进行处理,处理完后发送至目的终端,目的终端返回DNS响应报文后,将该报文发送至处理其请求报文的NAT-PT 处理单板进行处理,处理完后发送至源终端;203、 进入源终端与目的终端之间的业务流处理流程,将IPv4业务报文发送至包含其目的IPv4地址的地址池所属的NAT-PT处理单板进行处理,将IPv6业务报文发送至与其目的IPv6地址前缀匹配的NAT-PT 处理单板进行处理。 DETAILED DESCRIPTION OF THE DRAWINGS Specific embodiments and examples of the present invention will be further described in detail: The present invention provides a method of load sharing NAT-PT device, shown in Figure 2, comprising the steps of: 201, for each NAT- PT processing board configuration different NAT-PT and the IPv6 prefix address pool resources; 202, source terminal initiates a DNS (domain Name resolution) process, polling the DNS request sent to different NAT-PT processing board for processing, processed after transmission to the destination terminal, the destination terminal returns a DNS response packet, the packet will be sent to the processing request packets that NAT-PT process board is processed, after the processing to the transmission source terminal; 203, into the source terminal and business process flow stream between the destination terminals, the service IPv4 packet to the IPv4 address of an object comprising an address pool belonging NAT-PT processing board for processing, the IPv6 service packet to its destination IPv6 address prefix matching NAT-PT processing board for processing. 实施例一:通常,NAT - PT设备提供IPv4单协议域和IPv6单协议域中终端的通信,会话可由IPv4域终端发起,也可由IPv6域终端发起,因而上述 Example a: Typically, NAT - PT device provides a single protocol IPv4 terminal domain and the domain of a single IPv6 communication protocol, the terminal initiates a session by the IPv4 domain, IPv6 domains may also be initiated by the terminal, whereby said

方法中源终端为IPv4域终端或IPv6域终端,同时目的终端为IPv6域终端或者IPv4域终端,图3为本实施例的负荷分担方法原理示意图,也可以-现为分布式NAT - PT设备逻辑实现单元示意图。 Method terminal is a source terminal domain IPv4 or IPv6 terminal domain, while the destination terminal is an IPv6 or IPv4 terminal domain terminal domain, a schematic view of the principle of load sharing method according to the present embodiment of FIG. 3, may be - is currently distributed NAT - PT device logical schematic achieved unit. 其中,单元301:对于IPv6报文,提取IPv6报文目的地址的高96 位供单元302进行前缀匹配使用;对于IPv4报文,提取IPv4报文目的地址供单元302进行范围匹配使用。 Wherein unit 301: for IPv6 packets, extracts the destination address of the IPv6 packet 96 for high-prefix match using unit 302; for IPv4 packets, the destination address of the IPv4 packet extraction unit 302 for use for range matching. 单元302:负责提取出的前缀信息或是IPv4地址和负荷分担表进行匹配,确定报文是否做NAT-PT处理,并负荷分担到不同的NAT-PT 处理单板。 Unit 302: charge of the extracted IPv4 address prefix information and a load balancing or matching table, to determine whether the packets do NAT-PT process, load sharing and NAT-PT to a different process boards. 单元303:负荷分担表,维护NAT - PT IPv6前缀、地址池和各NAT -PT处理单板的对应关系,即负荷分担策略。 Unit 303: load sharing table, maintaining NAT - PT IPv6 prefix address pool, and the relationship between each NAT -PT processing board, i.e., load sharing policy. 单元304: NAT-PT处理单板,负责报文的NAT - PT处理,地址池和端口的管理;包括NAT - PT处理单元(包括DNS - ALG (Domain Name Service Application Level Gateway:域名解析月l务应用级网关)处理)、地址池和端口管理单元。 Unit 304: NAT-PT processing board, responsible for packet NAT - PT treatment, and address pool management port; including NAT - PT processing unit (including DNS - ALG (Domain Name Service Application Level Gateway: DNS month l Service application level gateway) process), and port address pool management unit. 下面分别描述在会话由IPv4域终端发起或者由IPv6域终端发起的两种情况下本实施例所采用的决策和负荷分担方法:前置条件:为各NAT - PT处理单板配置不同的单个NAT - PT IPv6 前缀信息和地址池资源。 Preconditions:: are described under the following IPv4 realm initiated by the terminal or the terminal initiated by the IPv6 domains in both cases the decision session and load sharing method according to the present embodiment used for the NAT - a different configuration of the individual processing board NAT PT - PT IPv6 address prefix information and pool resources. 对于NAT - PT设备而言,需要实现DNS-ALG, 源端在发起会话时, 一般会首先发起DNS流程,尤其是对于IPv4源端发起会话,必须首先发起DNS流程。 For NAT - PT in terms of equipment, need to implement DNS-ALG, the source when initiating a session, usually first initiated DNS process, especially for IPv4 source initiates a session, you must first initiate DNS process. 参考附图4和附图5,当IPv4终端发起会话的具体流程如下:Al: IPv4终端发起DNS流程,此时报文IPv4地址构成为<源:IPv4 域DNS服务器地址,目的:IPv4地址为对应IPv6域DNS服务器的IPv4地址>,此地址在NAT — PT设备配置的地址池范围之内,而且为了负荷分担,要求此地址在每个处理单板上静态配置。 With reference to FIGS. 4 and 5, when the IPv4 terminal initiating a session process is as follows: Al: IPv4 DNS terminal initiates flow, packets from the IPv4 address configured <Source: IPv4 domain DNS server address, destination: IPv4 address is an IPv6 IPv4 DNS server address field>, this address in NAT - the address pool configured PT equipment, and for load balancing requires this address is statically configured in each processing board. A2: IPv4 DNS请求报文被轮询发送到不同的单板进行NAT-PT、 DNS-ALG处理后,发送到IPv6域DNS服务器,假定报文被分发到单板1,此时报文IPv6地址构成为<源:前缀1 + IPv4域DNS服务器地址, 目的:IPv6域DNS服务器IPv6地址>。 A2: IPv4 DNS request packets are sent to different polling boards for NAT-PT, the DNS-ALG processing, transmits to the IPv6 DNS server domain, assuming the packet is distributed to the board 1, packets from an IPv6 address composed of is <source: 1 + IPv4 prefix domain DNS server address, destination: IPv6 address of the IPv6 DNS server domain>. A3: IPv6域DNS响应报文,IPv6目的地址的高96位为前缀1,故4皮分发到单板1进行NAT-PT处理和DNS-ALG处理,此时为IPv6终端分配IPv4地址(属于单板1地址池,记为IPv4 - 1)和端口号,同时生成相应的映射表条目,最后发送到IPv4终端。 A3: IPv6 DNS response packet field, high 96 IPv6 destination address prefix is ​​1, it is distributed to the skin board 4 1 NAT-PT and DNS-ALG processing process, this time assigned IPv4 address (an IPv6 terminal are single address pool plate 1, referred to as IPv4 - 1) and the port number, while generating a corresponding mapping table entry, and finally sent to the IPv4 terminal. A4:进入IPv4终端与IPv6终端之间的业务流处理流程。 A4: the traffic entering the process flow between the IPv4 terminal and the IPv6 terminal. 对于IPv4 终端发出的业务报文,目的IPv4地址为IPv4 - 1 ,故被分发到单板1进行NAT - PT处理,之后发送到IPv6终端;对于IPv6终端发出的业务报文,目的IPv6地址的高96位为前缀1,故被分发到对应的单板1进4亍NAT-PT处理。 For IPv4 service packet sent from the terminal, the destination IPv4 address of IPv4 - 1, it is distributed to the board 1 NAT - PT process, after transmitted to the IPv6 terminal; high traffic IPv6 packet sent from the terminal to the destination IPv6 address 96 is a prefix, it is distributed to the corresponding right foot board 1 into 4 treatment NAT-PT. 参考附图4和附图5,当IPv6终端发起会话的具体流程如下:Bl: IPv6终端首先发起DNS流程,此时报文IPv6地址构成为<源: IPv6域DNS服务器地址;目的:普通前缀+ IPv4域DNS服务器地址>。 With reference to FIGS. 4 and 5, IPv6 terminal when initiating a session process is as follows: Bl: IPv6 DNS terminal first initiates flow, packets from IPv6 address configured <Source: IPv6 DNS server address field; Objective: Normal + IPv4 prefix domain DNS server address>. B2: IPv6 DNS请求报文被轮询发送到不同的NAT-PT单板处理(假定被送到单板2),为IPv6 DNS服务器分配IPv4地址(属于单板2, 记为IPv4 - 2)和端口号,NAT-PT处理完成后发送到IPv4域DNS服务器。 B2: IPv6 DNS request packet is transmitted to poll a different process boards NAT-PT (supposed to be sent to the board 2), for the IPv6 DNS server IPv4 address assignment (of the board 2, referred to as IPv4 - 2) and port number, NAT-PT transmits to the IPv4 DNS server domain after processing. B3: IPv4 DNS响应才艮文,目的地址为IPv4-2,故被分发到相应的NAT-PT处理单板2处理,最后发送到IPv6终端,处理之后的报文IP B3: IPv4 DNS response packet Gen only the destination address is IPv4-2, it is distributed to the respective processing boards NAT-PT 2, and finally sent to the IPv6 terminal, after processing of IP packets

地址构成为<源:前缀2 + IPv4域DNS服务器地址,目的:IPv6域目的DNS服务器地址>。 Address configured <Source: 2 + IPv4 prefix domain DNS server address, destination: IPv6 address of the DNS server domain object>. B4:进入IPv4终端与IPv6终端之间的业务流处理流程。 B4: the traffic entering the process flow between the IPv4 terminal and the IPv6 terminal. 对于IPv6 终端发出的业务报文,目的IPv6地址的高96位为前缀2,故被分发到对应的NAT - PT单板2进行NAT - PT处理,此时为IPv6终端分配V4 地址和端口号,同时生成映射表信息,处理完成后发送到IPv4终端;IPv4 终端发出的业务报文,目的IPv4地址在NAT - PT单板2地址池范围之内,故被分发到NAT-PT单板2进行NAT - PT处理,之后发送到IPv6 终端。 96 for high traffic packet, an IPv6 destination IPv6 address prefix is ​​sent from the terminal 2, it is distributed to the corresponding NAT - PT board 2 NAT - PT treated, and V4 IPv6 terminal is assigned an address and port number, simultaneously generated map information, the processing is completed after the terminal transmits to the IPv4; IPv4 service packet sent from the terminal, in the destination IPv4 address of the NAT - PT board 2 within the address range, it is distributed to the NAT-PT NAT board 2 - PT process, after transmitted to the IPv6 terminal. 实施例二:在上述实施例一中,为每个NAT-PT单板配置了独立的前缀和不同的地址池资源,IPv6目的地址高96位前缀匹配和IPv4目的地址匹配仅仅用来决策报文是否需^f故处理和负荷分担,当业务报文分发到NAT -PT处理单板后,还需要决策报文是做NAT-PT,还是做NAPT-PT 处理,本实施例在上述实施例一的方案基础上进行了扩展,可以在决策和负荷分担时,同时确定出才艮文需处理的类型(NAT - PT处理和NAPT -PT处理),从而可以进一步提供设备的性能,具体扩展方案如下:(1) 为每个NAT - PT处理单板配置两个NAT - PT IPv6前缀,前缀A对应NAT-PT处理、前缀B对应NAPT-PT处理。 Example Two: In one embodiment the above-described embodiment, the configuration independent prefix and a different address pool for each resource NAT-PT board, the IPv6 destination address prefix matching the high 96 matching the destination address and IPv4 packets are only used to decision ^ f so whether it is necessary to share the processing load, and, when the service packet distributed to NAT -PT processing board, is needed to make the decision message NAT-PT, or do NAPT-PT process the embodiment described above in the present embodiment a when the program based on the extension, and the load can be shared in the decision, while it is determined that the type of paper to be treated Gen (NAT - PT and NAPT -PT treatment process), which can provide further performance of the device, as specific refinements : (1) for each NAT - PT two processing board configuration NAT - PT IPv6 prefix, the corresponding NAT-PT A process corresponding to the prefix B NAPT-PT process. (2) 将每个NAT-PT处理单板配置的地址池资源划分为两个部分:地址池A,仅用于NAT-PT处理,不使用端口;地址池B,使用端口号,用于NAPT-PT处理。 (2) processing each board configuration NAT-PT address pool resources divided into two parts: the address pool A, only for NAT-PT process, unused ports; pool B address, port number, for NAPT -PT process. (3 ) NAT - PT i殳备在分配地址和端口时,如果选择地址池A,则在处理过程中使用前缀A,如果选择地址池B,则在处理过程中使用前 PT i Shu before dispensing device at the address and port, if the selected address pool A, A prefix is ​​used in the process, if the select address pool B, then in process - (3) NAT

缀B。 Decorated B. 决策分发时根据不同的地址池匹配和前缀匹配,来确定NAT-PT 决策、类型区分和负荷分担。 When the decision distribution pools in accordance with different address matching and prefix matching to determine the NAT-PT decision, and to distinguish between the type of load sharing. 本发明还提出了一种NAT-PT设备,如图6所示,包括多个接口单板和多个NAT-PT处理单板,接口单板和NAT-PT处理单板通过总线进行通信。 The present invention also proposes a NAT-PT device, shown in FIG. 6, comprising a plurality of interface boards and a plurality of NAT-PT processing board, the interface board, and the board treated NAT-PT communicate via a bus. 所述接口单板包括互连的接口单元和决策分发单元,所述NAT-PT处理单板包括互连的NAT-PT处理单元和资源管理单元。 Said interface board comprising an interface unit and a decision distribution unit interconnected, the NAT-PT NAT-PT process board comprising a processing unit and a resource management unit interconnected. 其中,接口单元用于接收和发送IPv4和IPv6报文。 Wherein the interface unit for sending and receiving IPv4 and IPv6 packets. 决策分发单元用于将DNS报文轮询发送至NAT-PT处理单板;判断与业务报文的目的IPv6地址前缀或目的IPv4地址相匹配的NAT-PT处理单板,将业务报文分发至与其相匹配的NAT-PT处理单板。 Decision distribution unit configured to send the DNS packet to the NAT-PT polling processing board; or the prefix of the destination IPv6 address and destination IPv4 address of the service packet is determined to match the NAT-PT processing board, the service packet distributed to NAT-PT with its match processing board. NAT-PT处理单元用于对才艮文进4于处理。 NAT-PT was used for the processing unit 4 for processing text into Gen. 资源管理单元用于管理NAT-PT处理单板的地址池、端口和NAT-PT IPv6前缀资源。 Resource management unit for managing a process board NAT-PT address pool, port NAT-PT and the IPv6 prefix resources. 上述分布式NAT - PT设备的NAT-PT处理单板还可包括存储单元, 用来存储NAT-PT处理单寺反的地址池、端口和NAT-PT IPv6前缀资源。 Distributed above NAT - NAT-PT PT board processing apparatus may further include a storage unit for storing processing unit NAT-PT address pool anti Temple, port NAT-PT and the IPv6 prefix resources. 该设备还可包括控制面处理单元(用于处理进入设备的控制面信令和报文)、路由转发引擎单元(完成报文的路由转发)等。 The apparatus may further include a control plane processing unit (into the apparatus for processing and control plane signaling message), routing forwarding engine unit (complete packet routing and forwarding) and the like. 以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。 The above are only preferred embodiments of the present invention but are not intended to limit the present invention, any modifications within the spirit and principle of the present invention, equivalent replacements and improvements should fall in the protection of the present invention within range.

Claims (10)

1、一种NAT-PT设备的负荷分担方法,其特征在于,所述方法包括以下步骤: A、为各个NAT-PT处理单板配置不同的NAT-PT IPv6前缀和地址池资源; B、源终端发起域名解析流程,将域名解析请求报文轮询发送到不同NAT-PT处理单板进行处理,处理完后发送至目的终端,目的终端返回域名解析响应报文后,将该报文发送至处理其请求报文的NAT-PT处理单板进行处理,处理完后发送至源终端; C、进入源终端与目的终端之间的业务流处理流程,将IPv4业务报文发送至包含其目的IPv4地址的地址池所属的NAT-PT处理单板进行处理,将IPv6业务报文发送至与其目的IPv6地址前缀匹配的NAT-PT处理单板进行处理。 1, one kind of load sharing NAT-PT device, characterized in that, said method comprising the steps of: A, configure different NAT-PT and the IPv6 prefix address pool for each resource handle NAT-PT board; B, source initiating terminal domain name resolution process, the domain name resolution request poll message sent to a different NAT-PT processing board for processing, after processing is transmitted to the destination terminal, the destination terminal returns the DNS response packet, the packet will be sent to the which processes requests NAT-PT packet processing board for processing, processing after sending to the source terminal; C, the traffic entering the process flow between the source terminal and the destination terminal, the IPv4 packet to a service comprises an object IPv4 NAT-PT address pool processing board for processing belongs, the IPv6 packet to its service object NAT-PT IPv6 address prefix matching processing board for processing.
2、 如权利要求1所述的负荷分担方法,其特征在于,所述源终端为IPv4终端,所述目的终端为IPv6终端;或者,所述源终端为IPv6 终端,所述目的终端为IPv4终端。 2, a load sharing method as claimed in claim 1, wherein the IPv4 terminal is a source terminal, the destination terminal is an IPv6 terminal; alternatively, the source terminal of the IPv6 terminal, the IPv4 terminal to the destination terminal .
3、 如权利要求2所述的负荷分担方法,其特征在于,所述步骤A中为每个NAT-PT处理单板配置一个NAT-PT IPv6前缀和一个地址池,同时步骤C中对业务报文进行NAT-PT处理。 3. The load sharing method according to claim 2, wherein the step A for each processing board configuration NAT-PT NAT-PT a and a prefix of the IPv6 address pool of the service packet in Step C NAT-PT for text processing.
4、 如权利要求2所述的负荷分担方法,其特征在于,所述步骤A中为每个NAT-PT处理单板配置两个NAT-PT IPv6前缀,并将其地址池划分为包含端口号的和不包含端口号的两部分,分别与所述两个前缀对应。 4, as claimed in claim 2, said load sharing method, wherein the step A for each processing board configuration NAT-PT two NAT-PT the IPv6 prefix and the address is divided into pools containing the port number port number, and it does not include two portions, respectively corresponding to the two prefixes.
5、 如权利要求3或4所述的负荷分担方法,其特征在于,所述步骤B中,NAT-PT处理单板对所述域名解析请求报文及其响应报文的处理包括NAT-PT处理和域名解析处理。 5. The load sharing method according to claim 3 or claim 4, wherein the step B, NAT-PT processing board resolving request packet and its response packet processing includes the NAT-PT domain processing and domain name resolution process.
6、 如权利要求4所述的负荷分担方法,其特征在于,所述步骤C中,对于IPv4报文,若与其目的IPv4地址匹配的地址池不包括端口号,则NAT-PT处理单板对其进行NAT-PT处理,否则进行NAPT-PT 处理;对于IPv6报文,若与其匹配的前缀所对应的地址池不包括端口号,则对其进行NAT-PT处理,否则进行NAPT-PT处理。 6, as claimed in claim 4, wherein the load sharing method, wherein said step C, for IPv4 packet, if its address matches the destination IPv4 address pool does not include the port number, the NAT-PT process of veneer that performs NAT-PT treatment, or treatment for NAPT-PT; for an IPv6 packet, when its matching prefix corresponding to an address pool does not include the port number, NAT-PT is subjected to the processing, or processing for NAPT-PT.
7、 一种NAT-PT设备,其特征在于,所述设备包括互连的接口单板和NAT-PT处理单板,所述接口单板包括互连的接口单元和决策分发单元,所述NAT-PT处理单板包括互连的NAT-PT处理单元和资源管理单元;所述接口单元用于接收和发送IPv4和IPv6报文;单板;判断与业务报文的目的IPv6地址前缀或目的IPv4地址相匹配的NAT-PT处理单板,将业务报文分发至与其相匹配的NAT-PT处理单板;所迷NAT-PT处理单元用于对报文进行处理; 所述资源管理单元用于管理NAT-PT处理单板的地址池、端口和NAT-PT IPv6前缀资源。 7. A NAT-PT device, characterized in that the device comprises an interconnect interface boards and NAT-PT processing board, said interface board comprising an interface unit and a decision distribution unit interconnected, the NAT -PT processing board comprises a processing unit and NAT-PT interconnect resource management unit; said interface unit for sending and receiving IPv4 packets and IPv6; board; Analyzing business object IPv6 packets or the destination IPv4 address prefix address that matches the NAT-PT board process, to distribute the service packet processing board NAT-PT matched thereto; the fans NAT-PT processing unit configured to process the packet; for the resource management unit management NAT-PT address pool board processing, ports and NAT-PT IPv6 prefix resources.
8、 如权利要求7所述的NAT-PT设备,其特征在于,所述NAT-PT 处理单元对域名解析报文进行NAT-PT处理和域名解析处理,根据报文的前缀或其目的地址所属地址池对业务才艮文进行NAT-PT处理或NAPT-PT处理。 8, NAT-PT device as claimed in claim 7, wherein said processing unit NAT-PT DNS packets NAT-PT and DNS processing process, or a prefix of the destination address of the packet belongs according to address pool of business was conducted NAT-PT Gen text processing or NAPT-PT processing.
9、 如权利要求8所述的NAT-PT设备,其特征在于,所述NAT-PT 处理单板还包括存储单元,用于存储NAT-PT处理单板的地址池、端口和NAT-PT IPv6前缀资源。 9, as claimed in NAT-PT device according to claim 8, characterized in that the NAT-PT processing board further includes a storage unit for storing NAT-PT address pool processing board, the port, and the IPv6 NAT-PT prefix resources.
10、 如权利要求7、 8或9所述的NAT-PT设备,其特征在于, 所述设备还包括控制面处理单元和路由转发引擎单元,其中,所述控制面处理单元用于处理进入设备的控制面命令和报文; 所述路由转发引擎单元用于完成报文的路由转发。 10, NAT-PT device as claimed in 7, 8 or 9, characterized in that said apparatus further comprises a processing unit and a control plane routing forwarding engine unit, wherein the control plane processing unit for processing the access device the command and control plane packet; forwarding the routing engine unit for performing packet routing and forwarding.
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