WO2016037417A1 - 获取fqdn的方法、终端、服务器及双栈隧道建立系统 - Google Patents

获取fqdn的方法、终端、服务器及双栈隧道建立系统 Download PDF

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Publication number
WO2016037417A1
WO2016037417A1 PCT/CN2014/092063 CN2014092063W WO2016037417A1 WO 2016037417 A1 WO2016037417 A1 WO 2016037417A1 CN 2014092063 W CN2014092063 W CN 2014092063W WO 2016037417 A1 WO2016037417 A1 WO 2016037417A1
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ipv6cp
server
new option
terminal
fqdn
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PCT/CN2014/092063
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English (en)
French (fr)
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葛成华
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中兴通讯股份有限公司
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Publication of WO2016037417A1 publication Critical patent/WO2016037417A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/46—Interconnection of networks

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  • the present invention relates to the IPv6 transition technology in the communication field, and in particular, to obtaining a tunnel-endpoint-name, that is, obtaining a fully qualified domain name/full-name domain name of an address family transition router (AFTR). (Fully Qualified Domain Name) method, terminal, server and dual stack tunnel establishment system.
  • AFTR address family transition router
  • IPv4 Internet Protocol Version 4
  • IPv6 Internet Protocol Version 6
  • IPv6 Compared with IPv4, IPv6 has a larger address space, uses a smaller routing table, and adds enhanced multicast (Multicast) support and flow control (Flow Control), which makes the multimedia applications on the network grow. Opportunity to provide a good network platform for Quality of Service (QoS) control; IPv6 also adds support for Auto Configuration, which is the Dynamic Host Configuration Protocol (DHCP).
  • DHCP Dynamic Host Configuration Protocol
  • IPv6 has more advantages than IPv4 and solves many problems of IPv4, the current network still dominates IPv4. A large number of users still use IPv4, and upgrading IPv6 requires a lot of manpower, material resources, and financial resources. It takes a long time to complete.
  • IPv6 transition technology has emerged, one of which is dual stack evolution (DSLite, Dual-Stack Lite) technology.
  • the DSLite technology is a tunnel-based IPv6 transition technology.
  • the key parameter is the FQDN.
  • the FQDN can be used to resolve the address of the tunnel endpoint. With the tunnel endpoint address, the tunnel can be established normally and data can be forwarded normally. Therefore, the importance of FQDN in the implementation of DSLite technology is self-evident.
  • RFC6334 specifies that it is obtained through option 64 (option64) of DHCPv6, but no explanation is given for how to obtain the FQDN in IPv6 control protocol (IPv6CP, IPv6over PPP).
  • the embodiment of the invention provides a method for acquiring an FQDN, a terminal, a dual-stack tunnel establishing system, and a computer readable medium, which solves the problem that the DSLite transition technology cannot be implemented because the FQDN cannot be obtained in the IPv6CP.
  • An embodiment of the present invention provides a method for obtaining a domain name FQDN of a tunnel termination point, where the method includes:
  • the new option is used to carry the FQDN
  • the terminal sends an IPv6CP request message to the server, where the new option in the IPv6CP request message is empty;
  • the terminal receives the IPv6CP packet returned by the server, and the new option in the IPv6CP packet carries the FQDN required to establish a dual-stack tunnel between IPv6 and IPv4.
  • a new option is predefined in the IPv6CP message, and the new option is used to carry the FQDN, and further includes: configuring the new option as a non-critical option of the IPv6CP.
  • the method further includes:
  • DSLite In the networking environment, DSLite is not supported to switch to support DSLite and IPv6 and IPv4 are required.
  • the server does not respond to the saturation request message sent by the terminal.
  • the link is reset, and the link control protocol LCP and the network control protocol NCP are re-negotiated between the server and the terminal.
  • the terminal sends an IPv6CP request message to the server, where the new option is empty, in which the terminal sends an IPv6CP request message to the server in the NCP negotiation process, and the IPv6CP request message is in the IPv6CP request message.
  • the new option is empty.
  • the server does not respond to the saturation request message sent by the terminal, and the server does not respond to the saturation request message in batches according to different address segments.
  • a new option is pre-defined in the IPv6CP message, and the new option is used to carry the FQDN.
  • the method also includes: in the case that the networking environment must support DSLite, or the networking environment is impossible to exist, the server cannot provide the FQDN.
  • An embodiment of the present invention provides a method for establishing a dual stack tunnel, where the method includes:
  • the new option is used to carry the FQDN
  • the terminal sends an IPv6CP request message to the server, where the new option in the IPv6CP request message is empty;
  • the terminal receives the IPv6CP packet returned by the server, and the new option in the IPv6CP packet carries the FQDN required to establish a dual-stack tunnel between the IPv6 and the IPv4, and the IPv6CP packet includes an IPv6 address field and an IPv6 prefix field.
  • the terminal parses the FQDN in the new option to obtain a tunnel endpoint address, and parses the IPv6 address field to obtain an IPv6 address, and establishes a dual-stack tunnel between IPv6 and IPv4 based on the tunnel endpoint address and the IPv6 address.
  • An embodiment of the present invention provides a terminal, where the terminal includes:
  • a configuration unit configured to predefine a new option in the IPv6CP message, where the new option is used to carry the FQDN;
  • a requesting unit configured to send an IPv6CP request message to the server, where the new option in the IPv6CP request message is empty;
  • the receiving unit is configured to receive an IPv6CP packet returned by the server, where the new option carries an FQDN required for establishing a dual-stack tunnel between IPv6 and IPv4.
  • the configuration unit is further configured to configure the new option as a non-critical option of the IPv6CP.
  • the requesting unit is further configured to: when the NCP negotiation is performed between the terminal and the server, send an IPv6CP request message to the server in the NCP negotiation process, where the new option is in the IPv6CP request message. Is empty.
  • the configuration unit is further configured to configure the new option as a key option of the IPv6CP.
  • An embodiment of the present invention provides a server, where the server includes:
  • the response unit is configured to not respond to the saturation request message sent by the terminal when the networking environment never supports DSLite handover to support DSLite and needs to transition between IPv6 and IPv4;
  • the reset unit is configured to: when the number of times the response unit does not respond exceeds the specified number of times, the link is reset, and the link control protocol LCP and the network control protocol NCP are re-negotiated with the terminal.
  • the response unit is further configured to batch not respond to the saturation request message according to different address segments.
  • An embodiment of the present invention provides a terminal, where the terminal includes:
  • a configuration unit configured to predefine a new option in the IPv6CP message, where the new option is used to carry the FQDN;
  • a requesting unit configured to send an IPv6CP request message to the server, where the new option in the IPv6CP request message is empty;
  • the receiving unit is configured to receive an IPv6CP packet returned by the server, where the IPv6CP packet is received.
  • the new option carries an FQDN required to establish a dual-stack tunnel between IPv6 and IPv4;
  • the tunnel establishing unit is configured to parse the FQDN in the new option to obtain a tunnel endpoint address, and parse the IPv6 address field to obtain an IPv6 address, and establish a double-stack tunnel between the IPv6 and the IPv4 based on the tunnel endpoint address and the IPv6 address.
  • a dual-stack tunnel establishing system in the above solution comprising a terminal and a server;
  • the terminal includes:
  • a configuration unit configured to predefine a new option in the IPv6CP message, the new option to carry the FQDN, and configuring the new option as a non-critical option of the IPv6CP;
  • a requesting unit configured to send an IPv6CP request message to the server, where the new option in the IPv6CP request message is empty;
  • the receiving unit is configured to receive an IPv6CP packet returned by the server during the NCP negotiation process between the terminal and the server, where the new option carries the FQDN required for establishing a dual-stack tunnel between the IPv6 and the IPv4;
  • the server includes: a response unit configured to not respond to the saturation request message sent by the terminal when the transition between IPv6 and IPv4 is required in the current environment; and the reset unit is configured to: when the response unit does not respond more than the specified number of times The link is reset, and the link control protocol LCP and the network control protocol NCP are re-negotiated with the terminal.
  • the terminal further includes: a tunnel establishing unit configured to parse the FQDN in the new option to obtain a tunnel endpoint address, and parse the IPv6 address field to obtain an IPv6 address, based on the tunnel endpoint address and IPv6 The address establishes a dual-stack tunnel between IPv6 and IPv4.
  • a tunnel establishing unit configured to parse the FQDN in the new option to obtain a tunnel endpoint address, and parse the IPv6 address field to obtain an IPv6 address, based on the tunnel endpoint address and IPv6 The address establishes a dual-stack tunnel between IPv6 and IPv4.
  • the embodiment of the invention further provides a computer readable medium, wherein the computer readable medium stores executable instructions for performing the method for acquiring a tunnel endpoint domain name FQDN as described above.
  • An embodiment of the present invention further provides a computer readable medium, where the computer readable medium is stored There are stored executable instructions for performing the method of establishing a dual stack tunnel as described above.
  • the FQDN of the DSLite can be dynamically obtained, so that the terminal obtains the FQDN in the IPv6CP of the PPP, so that the DSLite technology can be implemented when the transition between IPv4 and IPv6 is required in the IPv6CP, and can be dynamically implemented in the case of the PPP network.
  • the use of the DSLite tunnel solves the problem that the FQDN in the IPv6CP cannot be successfully obtained, and the DSLite transition technology cannot be implemented. Therefore, in the same configuration, the embodiment of the present invention can dynamically determine whether to support DSLite or not according to the environment. When to support DSLite, the uniformity of the network is guaranteed.
  • FIG. 1 is a flowchart of acquiring an FQDN according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic structural diagram of a terminal according to a fourth embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of another terminal according to Embodiment 4 of the present invention.
  • FIG. 5 is a schematic structural diagram of a server according to Embodiment 4 of the present invention.
  • FIG. 6 is a schematic structural diagram of a dual-stack tunnel establishing system according to Embodiment 4 of the present invention.
  • the embodiment of the present invention provides a method for obtaining an FQDN, which can enable a terminal to obtain an FQDN in an IPv6CP of a PPP, so that a DSLite technology can be implemented when a transition between IPv4 and IPv6 is required in an IPv6CP, in the case of a PPP network.
  • the DSLite tunnel can be used dynamically.
  • the method may include the following steps:
  • Step 101 Predefine a new option in the IPv6CP message, where the new option is used to carry the FQDN;
  • Step 102 The terminal sends an IPv6CP request message to the server, where the new option in the IPv6CP request message is empty, requesting to obtain an FQDN.
  • Step 103 The terminal receives the IPv6CP packet returned by the server, and the new option in the IPv6CP packet carries the FQDN required to establish a dual-stack tunnel between the IPv6 and the IPv4, thereby acquiring the FQDN required for establishing the dual-stack tunnel.
  • the options currently using IPv6CP are: field 3, field 5, field 129, field 131, where 3
  • the number field is an IPv6-address field
  • the field number 5 is an IPv6 prefix (IPv6-Prefix) field
  • the field number 129 is a Primary DNS Server IPv6 Address field
  • the 131-segment is an alternative DNS service.
  • IPv6 Address (Alternative DNS Server IPv6 Address) field.
  • a new option is added to the packet of the IPv6CP.
  • the new option is named as the number 6 field, and the new option is used to carry the FQDN, that is, the named 6 in the embodiment of the present invention.
  • the number field is the FQDN field.
  • PPP can be negotiated to the FQDN of DSLite through IPv6CP.
  • the terminal can establish a DSLite tunnel under IPv6CP.
  • IPv6CP requires the new option to be a key option when adding a new option, according to the IPv6CP rules, if the key option is not available, the link will not be established normally; if the non-critical option is not available for the first time, it will exist. A situation that will never be available. That is to say, for the method for obtaining the FQDN in the embodiment of the present invention, if the new option is set as the key option, the terminal cannot obtain the link, and if the new option is set to the non-critical option, if the terminal is built. When the FQDN is not obtained for the first time, there is a case where the FQDN is never obtained.
  • the embodiment of the present invention sets the new option, that is, the new option that carries the FQDN, as a non-critical option.
  • the server replies with the key option.
  • the terminal you can ensure that the terminal gets all the key options to ensure that the PPP is properly built.
  • NCP PPP network control protocol
  • the server cannot provide the FQDN to the terminal.
  • the new option corresponding to the FQDN is set as a non-critical option. , you can ensure that PPP is built normally.
  • the method in the embodiment of the present invention can be implemented to ensure that the terminal can obtain the FQDN after the networking environment is converted.
  • the IPv6 is required in the current environment.
  • the server may not respond to the Echo-Reques message sent by the terminal. If the number of times the server does not respond exceeds the specified number of times (normally, three times does not respond), the server shall follow the PPP protocol.
  • the Link Control Protocol (LCP) and the NCP are re-negotiated.
  • the protocol is IPv6CP.
  • the terminal can send an IPv6CP request to the server during the NCP negotiation. A message to request a FQDN from the server.
  • the server Since the server does not respond to all Echo-Reques messages at one time, it will cause a large area of sudden disconnection.
  • the server does not respond to the saturation request message sent by the terminal, and may be performed in a batch manner, that is, the server may not respond to the Echo-Reques message according to different address segments in batches.
  • the scenario that is, the sudden support in the environment or the sudden support of the DSLite
  • the server does not respond to the Echo-Reques message.
  • the server may not respond to Echo-Reques packets having one or several (such as two or three) identical address segments at a time, as long as the server does not respond to all Echo-Reques messages at one time.
  • the method for obtaining the FQDN provided by the embodiment of the present invention is basically the same as that of the foregoing embodiment 1.
  • the difference is that the DSLite or the networking environment must be supported by the server in the networking environment. The situation of the terminal.
  • the server cannot provide the FQDN to the terminal, and the new option corresponding to the FQDN can be set as a key option, so that only the terminal It is only when the FQDN is obtained that PPP can be established normally.
  • the server when the networking environment supports DSLite, when the NCP requesting PPP is sent to the terminal, the server can definitely provide the FQDN to the terminal. For this case, the new option corresponding to the FQDN is set as a key option to ensure PPP for the first time. You can build a chain and you don't need to rebuild it. In this embodiment, the related actions of the server in the case that the networking environment never supports DSLite conversion to support DSLite are omitted.
  • the new option corresponding to the FQDN may be set as a non-critical option.
  • the implementation of the method for obtaining the FQDN is the same as that of the first embodiment, and details are not described herein.
  • the embodiment of the present invention provides a method for establishing a dual-stack tunnel. As shown in FIG. 2, the method includes:
  • Step 201 Predefining a new option in the IPv6CP message, where the new option is used to carry the FQDN;
  • Step 202 The terminal sends an IPv6CP request message to the server, where the new option is empty in the IPv6CP request message.
  • Step 203 The terminal receives the IPv6CP packet returned by the server, where the new option carries the FQDN required to establish a dual-stack tunnel between the IPv6 and the IPv4, and the IPv6CP packet includes an IPv6 address field and an IPv6 prefix field.
  • Step 204 The terminal parses the FQDN in the new option to obtain a tunnel endpoint address, and parses the IPv6 address field to obtain an IPv6 address, and establishes a dual-stack tunnel between IPv6 and IPv4 based on the tunnel termination address and the IPv6 address.
  • the specific implementation of the process of obtaining the FQDN in the steps 201 to 203 can be implemented by using the first embodiment and the second embodiment, and details are not described herein.
  • the IPv6 CP packet in the step 203 may include a primary DNS service IPv6 address field and an alternate DNS service IPv6 address field in addition to the IPv6 address field and the IPv6 prefix field. That is, the options that can be included in the IPv6CP packet in the embodiment of the present invention are: the third field, the fifth field, the 129 field, the 131 field, and the sixth field named in the embodiment of the present invention. This is the new option for hosting the FQDN.
  • the embodiment of the present invention further provides an apparatus and a system corresponding to the foregoing method, which can enable a terminal to obtain an FQDN in an IPv6CP of a PPP, and implement a DSLite technology in a transition between IPv4 and IPv6 in an IPv6CP, in the case of a PPP network.
  • the DSLite tunnel can be used dynamically.
  • the embodiment of the invention provides a terminal. As shown in FIG. 3, the terminal includes:
  • the configuration unit 301 is configured to predefine a new option in the IPv6CP message, where the new option is configured to carry the FQDN;
  • the requesting unit 302 is configured to send an IPv6CP request message to the server, where the new option is empty in the IPv6CP request message;
  • the receiving unit 304 is configured to receive an IPv6CP packet returned by the server, where the new option carries an FQDN required for establishing a dual-stack tunnel between IPv6 and IPv4.
  • the configuration unit 301 is further configured to configure the new option as a non-critical option of the IPv6CP.
  • the specific implementation process is the same as that in Embodiment 1, and will not be described again.
  • the configuration unit 301 is further configured to configure the new option as a key option of the IPv6CP.
  • the specific implementation process is the same as that in the second embodiment, and will not be described again.
  • the embodiment of the present invention further provides another terminal, which includes a configuration unit 301, a request unit 302, and a receiving unit 304, and a tunnel establishing unit 401 configured to parse the new option.
  • the FQDN in the middle obtains the tunnel endpoint address, and parses the IPv6 address field to obtain an IPv6 address, and establishes a dual-stack tunnel between IPv6 and IPv4 based on the tunnel endpoint address and the IPv6 address.
  • the configuration unit 301, the request unit 302, and the tunnel establishment unit 401 in the terminal may be implemented by a microprocessor (MCU) or a logic programmable gate array (FPGA) in the terminal; the receiving unit 304 may be supported by a network protocol in the terminal.
  • MCU microprocessor
  • FPGA logic programmable gate array
  • the embodiment of the present invention further provides a server, where the server may include: a response unit 501 configured to not respond to a saturation request message sent by the terminal when a transition between IPv6 and IPv4 is required in the current environment.
  • the reset unit 502 is configured to reset the link when the number of times the response unit does not respond exceeds the specified number of times, and re-establish the link control protocol LCP and the network control protocol NCP negotiation with the terminal.
  • the response unit 501 is further configured to batch not respond to the saturation request message according to different address segments.
  • the response unit 501 reset unit 502 can be implemented by a microprocessor (MCU) or a logic programmable gate array (FPGA) in the server.
  • MCU microprocessor
  • FPGA logic programmable gate array
  • the embodiment of the present invention further provides a dual-stack tunnel establishing system, including a terminal 601 and a server 602.
  • the terminal 601 is configured to: predefine a new option in an IPv6CP message, where the new option is used.
  • the FQDN is carried; the IPv6CP request packet is sent to the server, and the new option in the IPv6CP request packet is empty; the IPv6CP packet returned by the server is received, and the new option in the IPv6CP packet carries the double between IPv6 and IPv4.
  • Server 602 is configured to never support DSLite switching to support DSLite in a networking environment and When a transition between IPv6 and IPv4 is required, the saturation request message sent by the terminal is not responded;
  • the server 602 is further configured to: when the number of times the response unit does not respond exceeds the specified number of times, the link is reset, and the link control protocol LCP and the network control protocol NCP are re-negotiated with the terminal.
  • the server 602 is further configured to batch not respond to the saturation request message according to different address segments.
  • the terminal 601 is further configured to parse the FQDN in the new option to obtain a tunnel endpoint address, and parse the IPv6 address field to obtain an IPv6 address, and establish an IPv6 and IPv4 interval based on the tunnel termination address and the IPv6 address. Double stack tunnel.
  • the terminal 601 is also configured to configure the new option as a non-critical option of the IPv6CP.
  • the terminal 601 is further configured to send an IPv6CP request message to the server during the NCP negotiation process, and the new option in the IPv6CP request message is empty.
  • the terminal 601 is further configured to configure the new option as a key option of the IPv6CP.
  • the terminal 601 may be any one of the terminals shown in FIG. 3 or FIG. 4, and the composition of the server 602 is the same as that of the server shown in FIG. 5.
  • the configuration unit of terminal 601 is configured to configure the new option as a non-critical option for IPv6CP.
  • the method for obtaining the FQDN and the method for establishing the dual-stack tunnel in the embodiment of the present invention can be implemented by using the foregoing method embodiments, and details are not described herein.
  • all the mentioned servers refer to a PPP server or any type of server capable of providing PPP services
  • all the mentioned terminals may be any capable of processing the PPP industry.
  • Terminals such as CPE equipment, portable terminals, etc.
  • modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.
  • the steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module.
  • the invention is not limited to any specific combination of hardware and software.

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Abstract

本发明公开了一种获取隧道终结点域名FQDN的方法，所述方法包括：在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；终端向服务器发送IPv6CP请求报文，所述IPv6CP请求报文中所述新选项为空；终端接收服务器返回的IPv6CP报文，所述IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN。相应的，本发明还公开了一种终端、服务器，建立双栈隧道的方法、系统及计算机可读介质。

Description

获取FQDN的方法、终端、服务器及双栈隧道建立系统 技术领域
本发明涉及通信领域的IPv6过渡技术，尤其涉及一种获取隧道终结点域名(tunnel-endpoint-name)，也即获取地址族过渡路由单元(AFTR，Address Family Transition Router)的完全合格域名/全称域名(Fully Qualified Domain Name)的方法、终端、服务器及双栈隧道建立系统。
背景技术
随着电子技术及网络技术的发展，计算机网络将进入人们的日常生活，大量的设备接入网络。但我们当前使用的是互联网协议版本4(IPv4，Internet Protocol Version 4)的互联网技术，地址空间有限，并不能支持让所有的设备都接入到互联网中，因此互联网协议版本6(IPv6，Internet Protocol Version6)技术应运而生。
相比于IPv4，IPv6具有更大的地址空间，使用更小的路由表，增加了增强的组播(Multicast)支持以及对流的控制(Flow Control)，这使得网络上的多媒体应用有了长足发展的机会，为服务质量(QoS，Quality of Service)控制提供了良好的网络平台；IPv6还加入了对自动配置(Auto Configuration)的支持，这是对动态主机配置协议(DHCP，Dynamic Host Configuration Protocol)的改进和扩展，使得网络(尤其是局域网)的管理更加方便和快捷，具有更高的安全性。
虽然IPv6相比IPv4具有更多优点，解决了IPv4的很多问题，但是当前的网络还是IPv4占据主导地位，大量的用户还在使用IPv4，而升级IPv6需要投入大量的人力、物力、财力，而且需要很长的一段时间才能完成。
在此背景下，产生了IPv6过渡技术，其中之一就是双栈演进(DSLite， Dual-Stack Lite)技术。DSLite技术是一种隧道类的IPv6过渡技术，关键参数是FQDN，通过FQDN能够解析出隧道终结点的地址，有了隧道终结点的地址，才能正常建立起隧道，数据才能正常转发。因此，FQDN在DSLite技术实现上的重要性不言而喻。
对于DSLite技术中非常重要的FQDN，RFC6334规定了通过DHCPv6的选项64(option64)获取，但是对于在IPv6控制协议(IPv6CP，IPv6over PPP)中如何获取FQDN并没有给出说明。
综上所述，IPv6CP中FQDN不能成功获取将直接导致IPv6CP中DSLite过渡技术无法实施，相关技术中尚无有效解决方案。
发明内容
本发明实施例提供一种获取FQDN的方法、终端、双栈隧道建立系统、计算机可读介质，解决IPv6CP中因无法获取FQDN而无法实施DSLite过渡技术的问题。
本发明实施例的技术方案是这样实现的：
本发明实施例提供一种获取隧道终结点域名FQDN的方法，所述方法包括：
在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
终端向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空；
终端接收服务器返回的IPv6CP报文，该IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN。
上述方案中，在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN，还包括：将所述新选项配置为IPv6CP的非关键选项。
上述方案中，所述方法还包括：
在组网环境从不支持DSLite切换到支持DSLite并且需要IPv6与IPv4 之间过渡时，服务器不响应终端发送的饱和请求报文，服务器不响应的次数超过指定次数时，链路复位，服务器与终端之间重新进行链路控制协议LCP和网络控制协议NCP协商；
所述终端向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空，具体为：在所述NCP协商过程中，终端向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空。
上述方案中，所述服务器不响应终端发送的饱和请求报文，为：所述服务器根据不同地址段分批不响应饱和请求报文。
上述方案中，在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN，还包括：在组网环境必支持DSLite的情况下或者组网环境根本不可能存在服务器不能提供FQDN的情况下，将所述新选项配置为IPv6CP的关键选项。
本发明实施例提供一种建立双栈隧道的方法，所述方法包括：
在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
终端向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空；
终端接收服务器返回的IPv6CP报文，该IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN，该IPv6CP报文包括IPv6地址字段、IPv6前缀字段；
终端解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
本发明实施例提供一种终端，所述终端包括：
配置单元，配置为在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
请求单元，配置为向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空；
接收单元，配置为接收服务器返回的IPv6CP报文，该IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN。
上述方案中，所述配置单元，还配置为将所述新选项配置为IPv6CP的非关键选项。
上述方案中，所述请求单元，还配置为在终端与服务器之间重新进行NCP协商时，在所述NCP协商过程中，向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空。
上述方案中，在组网环境必支持DSLite的情况下或者组网环境根本不可能存在服务器不能提供FQDN的情况下，所述配置单元，还配置为将所述新选项配置为IPv6CP的关键选项。
本发明实施例提供一种服务器，所述服务器包括：
响应单元，配置为在组网环境从不支持DSLite切换到支持DSLite并且需要IPv6与IPv4之间过渡时，不响应终端发送的饱和请求报文；
复位单元，配置为在所述响应单元不响应的次数超过指定次数时，链路复位，与终端之间重新进行链路控制协议LCP和网络控制协议NCP协商。
上述方案中，所述响应单元，还配置为根据不同地址段分批不响应饱和请求报文。
本发明实施例提供一种终端，所述终端包括：
配置单元，配置为在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
请求单元，配置为向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空；
接收单元，配置为接收服务器返回的IPv6CP报文，该IPv6CP报文中 所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN；
隧道建立单元，配置为解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
上述方案中一种双栈隧道建立系统，所述系统包括终端和服务器；
所述终端包括：
配置单元，配置为在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN，将所述新选项配置为IPv6CP的非关键选项；
请求单元，配置为向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空；
接收单元，配置为在终端与服务器之间的NCP协商过程中，接收服务器返回的IPv6CP报文，该IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN；
所述服务器包括：响应单元，配置为当前环境下需要IPv6与IPv4之间过渡时，不响应终端发送的饱和请求报文；复位单元，配置为在所述响应单元不响应的次数超过指定次数时，链路复位，与终端之间重新进行链路控制协议LCP和网络控制协议NCP协商。
上述方案中，所述终端还包括：隧道建立单元，配置为解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
本发明实施例还提供一种计算机可读介质，所述计算机可读介质中存储有可执行指令，所述可执行指令用于执行以上所述的获取隧道终结点域名FQDN的方法。
本发明实施例还提供一种计算机可读介质，所述计算机可读介质中存 储有可执行指令，所述可执行指令用于执行以上所述的建立双栈隧道的方法。
本发明实施例，可以实现DSLite的FQDN动态获取，使得终端在PPP的IPv6CP中获取到FQDN，以便在IPv6CP中IPv4和IPv6之间需要过渡时能够实施DSLite技术，在PPP组网的情况下能动态的使用DSLite隧道，解决了IPv6CP中FQDN不能成功获取而直接导致DSLite过渡技术无法实施的问题，这样可以在同样的配置情况下，根据环境的不同，本发明实施例可以动态的决定是否支持DSLite以及何时支持DSLite，保证了网络的统一性。
附图说明
图1为根据本发明实施例一的获取FQDN流程图；
图2为根据本发明实施例三的建立双栈隧道流程图；
图3为根据本发明实施例四的一种终端的组成结构示意图；
图4为根据本发明实施例四的另一种终端的组成结构示意图；
图5为根据本发明实施例四的服务器的组成结构示意图；
图6为根据本发明实施例四的双栈隧道建立系统的组成结构示意图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚明白，以下举实施例并参照附图，对本发明进一步详细说明。
实施例一
本发明实施例提供了一种获取FQDN的方法，该方法可以使得终端在PPP的IPv6CP中获取到FQDN，以便在IPv6CP中IPv4和IPv6之间需要过渡时能够实施DSLite技术，在PPP组网的情况下能动态的使用DSLite隧道。
如图1所示，所述方法可以包括如下步骤：
步骤101：在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
步骤102：终端向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空，请求获取FQDN；
步骤103：终端接收服务器返回的IPv6CP报文，该IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN，从而获取到建立双栈隧道所需要的FQDN。
按照PPP IPv6控制协议扩展(draft-hu-pppext-ipv6cp-extensions-01)的说明，当前使用了IPv6CP的选项分别是：3号字段、5号字段、129号字段、131号字段，其中，3号字段是IPv6地址(IPv6-Address)字段，5号字段是IPv6前缀(IPv6-Prefix)字段，129号字段是初级DNS服务IPv6地址(Primary DNS Server IPv6Address)字段，131号段是可替代DNS服务IPv6地址(Alternative DNS Server IPv6Address)字段。本发明实施例中，在IPv6CP的报文中还增加了一个新选项，本发明实施例将该新选项命名为6号字段，该新选项用于承载FQDN，即本发明实施例中命名的6号字段为FQDN字段。有了这个字段，PPP通过IPv6CP就可以协议到DSLite的FQDN，结合3号字段，终端就可以在IPv6CP下建立DSLite隧道。
由于IPv6CP要求在增设新选项时，需要设置该新选项是否为关键选项，按照IPv6CP规定，关键选项获取不到的话，将无法正常建链；非关键选项如果第一次获取不到的话，就存在永远都获取不到的情况。也就是是说，对于本发明实施例获取FQDN的方法，若是将新选项设置为关键选项的话，终端获取不到将无法正常建链，若是将新选项设置为非关键选项的话，如果终端建链时第一次获取不到FQDN的话，就存在永远都获取不到FQDN的情况。
针对上述问题，本发明实施例将所述新选项即承载FQDN的新选项设置为非关键选项，这样的话，由于FQDN的相关选项为非关键选项，即使终端获取不到FQDN，只要服务器回复关键选项给终端，就可以保证终端获取到所有关键选项，从而确保PPP正常建链。例如，在组网环境不支持DSLite时，发PPP的网络控制协议(NCP，Network Control Protocol)请求时，服务器就不能提供FQDN给终端，对于这种情况将FQDN对应的新选项设置为非关键选项，就可以保证确保PPP正常建链。
若是组网环境从不支持DSLite转换到了支持DSLite时，本发明实施例的方法可以这样实现，来确保终端能够组网环境转换后获取到FQDN：当组网环境支持DSLite时，当前环境下需要IPv6与IPv4之间过渡时，服务器可以不响应终端发过来的保活请求(Echo-Reques)报文，服务器不响应的次数超过指定次数(正常情况下，三次不响应)时，按照PPP协议规范此时整个链路就会复位，重新进行链路控制协议(LCP，Link Control Protocol)和NCP的协商，协商到NCP时，协议是IPv6CP，此时终端就可以在NCP协商过程中向服务器发送IPv6CP请求报文，以向服务器请求获取FQDN。
由于服务器一次性不响应所有的Echo-Reques报文将会导致大面积的突然断线。使用本发明实施例的上述方法中，服务器不响应终端发送的饱和请求报文时可以通过分批次的方式来进行，即服务器可以根据不同地址段分批不响应Echo-Reques报文，实际上述场景(即环境中突然支持或者突然不支持DSLite)并不经常出现，因此，本发明实施例在实际实现时需要服务器不响应Echo-Reques报文的时机并不多。其中，服务器可以每次不响应具有一个或几个(如两个或者三个)相同地址段的Echo-Reques报文，只要能够保证服务器不会一次性不响应所有Echo-Reques报文即可。
实施例二
本发明实施例提供的一种获取FQDN的方法，与上述实施例一基本相同，所不同的是，本实施例针对组网环境必支持DSLite、或者组网环境根本不可能存在服务器不能提供FQDN给终端的情况。
本实施例中，组网环境必支持DSLite的情况下，或者组网环境根本不可能存在服务器不能提供FQDN给终端的情况下，可以将FQDN对应的新选项设置为关键选项，这样的话，只有终端能够获取到FQDN时才可以确保PPP正常建链。
例如，在组网环境支持DSLite时，在发PPP的NCP请求给终端时，服务器就肯定可以提供FQDN给终端，对于这种情况将FQDN对应的新选项设置为关键选项，可以确保PPP第一次就可以建链，也不需要重新建链。本实施例也就省去了实施例一在组网环境从不支持DSLite转换到了支持DSLite时服务器的一些相关动作。
当然，本实施例中也可以将FQDN对应的新选项设置为非关键选项，这样设置的话获取FQDN方法的执行与实施例一相同，不再赘述。
实施例三
在组网环境支持DSLite的情况，在IPv6CP中IPv4和IPv6之间需要过渡时，本发明实施例提供一种建立双栈隧道的方法，如图2所示，所述方法包括：
步骤201：在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
步骤202：终端向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空；
步骤203：终端接收服务器返回的IPv6CP报文，该IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN，该IPv6CP报文包括IPv6地址字段、IPv6前缀字段；
步骤204：终端解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
本实施例中，步骤201～203中获取FQDN的过程具体实现可以通过实施例一和实施例二来实现，不再赘述。
其中，步骤203中该IPv6CP报文除了包括IPv6地址字段、IPv6前缀字段，之外还可以包含初级DNS服务IPv6地址字段和可替代DNS服务IPv6地址字段。也就是说，本发明实施例中IPv6CP报文可以包含的选项分别是：3号字段、5号字段、129号字段、131号字段以及本发明实施例中命名的6号字段，该6号字段即为用于承载FQDN的新选项。
实施例四
本发明实施例还提供了对应于上述方法的装置和系统，可以使得终端在PPP的IPv6CP中获取到FQDN，在IPv6CP中IPv4和IPv6之间需要过渡时能够实施DSLite技术，在PPP组网的情况下能动态的使用DSLite隧道。
本发明实施例提供了一种终端，如图3所示，所述终端包括：
配置单元301，配置为在IPv6CP报文预定义一个新选项，所述新选项配置为承载FQDN；
请求单元302，配置为向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空；
接收单元304，配置为接收服务器返回的IPv6CP报文，该IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN。
其中，所述配置单元301还配置为将所述新选项配置为IPv6CP的非关键选项。具体实现过程与实施例一相同，不再赘述。
其中，在组网环境必支持DSLite的情况下，或者组网环境根本不可能 存在服务器不能提供FQDN给终端的情况下，所述配置单元301还配置为将所述新选项配置为IPv6CP的关键选项。具体实现过程与实施例二相同，不再赘述。如图4所示，本发明实施例还提供了另一个终端，该终端除了包含上述的配置单元301、请求单元302和接收单元304以外，还包括隧道建立单元401，配置为解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
实际应用中，终端中的配置单元301、请求单元302、隧道建立单元401可由终端中的微处理器(MCU)或逻辑可编程门阵列(FPGA)实现；接收单元304可由终端中的支持网络协议的专用集成电路芯片实现。
如图5所示，本发明实施例还提供了一种服务器，所述服务器可以包括：响应单元501，配置为当前环境下需要IPv6与IPv4之间过渡时，不响应终端发送的饱和请求报文；复位单元502，配置为在所述响应单元不响应的次数超过指定次数时，链路复位，与终端之间重新进行链路控制协议LCP和网络控制协议NCP协商。其中，所述响应单元501，还配置为根据不同地址段分批不响应饱和请求报文。
实际应用中，响应单元501复位单元502可由服务器中的微处理器(MCU)或逻辑可编程门阵列(FPGA)实现。
如图6所示，本发明实施例还提供了一种双栈隧道建立系统，包括终端601和服务器602；其中，终端601配置为：在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空；接收服务器返回的IPv6CP报文，该IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN；
服务器602配置为在组网环境从不支持DSLite切换到支持DSLite并且 需要IPv6与IPv4之间过渡时，不响应终端发送的饱和请求报文；
作为一个实施方式，服务器602还配置为在所述响应单元不响应的次数超过指定次数时，链路复位，与终端之间重新进行链路控制协议LCP和网络控制协议NCP协商。
作为一个实施方式，服务器602还配置为根据不同地址段分批不响应饱和请求报文。
作为一个实施方式，终端601还配置为解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
作为一个实施方式，终端601还配置为将所述新选项配置为IPv6CP的非关键选项。
作为一个实施方式，终端601还配置为在与服务器之间重新进行NCP协商时，在所述NCP协商过程中，向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空。
作为一个实施方式，在组网环境必支持DSLite的情况下或者组网环境根本不可能存在服务器不能提供FQDN的情况下，终端601还配置为将所述新选项配置为IPv6CP的关键选项。
所述终端601可以是图3或图4所示终端的任意一种，服务器602的组成结构与图5所示的服务器相同。此系统中，终端601的配置单元配置为将所述新选项配置为IPv6CP的非关键选项。
本发明实施例提供的终端及系统执行本发明实施例获取FQDN的方法、建立双栈隧道的方法的具体过程都可以通过上述的相应方法实施例来实现，不再赘述。
本发明实施例中，所有提到的服务器均是指PPP服务器或者能够提供PPP服务的任意类型服务器，所有提到的终端可以是任意能够处理PPP业 务的终端，如CPE设备、便携终端等。
显然，本领域的技术人员应该明白，上述的本发明的各模块或各步骤可以用通用的计算装置来实现，它们可以集中在单个的计算装置上，或者分布在多个计算装置所组成的网络上，可选地，它们可以用计算装置可执行的程序代码来实现，从而，可以将它们存储在存储装置中由计算装置来执行，并且在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤，或者将它们分别制作成各个集成电路模块，或者将它们中的多个模块或步骤制作成单个集成电路模块来实现。这样，本发明不限制于任何特定的硬件和软件结合。
以上所述，仅为本发明的较佳实施例而已，并非用于限定本发明的保护范围。

Claims (17)

  1. 一种获取隧道终结点域名FQDN的方法，所述方法包括：
    在互联网协议版本六控制协议IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
    终端向服务器发送IPv6CP请求报文，所述IPv6CP请求报文中所述新选项为空；
    终端接收服务器返回的IPv6CP报文，所述IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN。
  2. 根据权利要求1所述的方法，其中，在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN，还包括：将所述新选项配置为IPv6CP的非关键选项。
  3. 根据权利要求2所述的方法，其中，所述方法还包括：
    在组网环境从不支持双栈演进DSLite切换到支持DSLite并且需要IPv6与IPv4之间过渡时，服务器不响应终端发送的饱和请求报文，服务器不响应的次数超过指定次数时，链路复位，服务器与终端之间重新进行链路控制协议LCP和网络控制协议NCP协商；
    相应地，所述终端向服务器发送IPv6CP请求报文，该IPv6CP请求报文中所述新选项为空，包括：在所述NCP协商过程中，终端向服务器发送IPv6CP请求报文，所述IPv6CP请求报文中所述新选项为空。
  4. 根据权利要求3所述的方法，其中，所述服务器不响应终端发送的饱和请求报文，包括：所述服务器根据不同地址段分批不响应饱和请求报文。
  5. 根据权利要求1所述的方法，其中，在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN，还包括：在组网环境必支持DSLite的情况下或者组网环境根本不可能存在服务器不能提供FQDN的情况下，将 所述新选项配置为IPv6CP的关键选项。
  6. 一种建立双栈隧道的方法，所述方法包括：
    在互联网协议版本六控制协议IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
    终端向服务器发送IPv6CP请求报文，所述IPv6CP请求报文中所述新选项为空；
    终端接收服务器返回的IPv6CP报文，所述IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN，所述IPv6CP报文包括IPv6地址字段、IPv6前缀字段；
    终端解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
  7. 一种终端，所述终端包括：
    配置单元，配置为在互联网协议版本六控制协议IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
    请求单元，配置为向服务器发送IPv6CP请求报文，所述IPv6CP请求报文中所述新选项为空；
    接收单元，配置为接收服务器返回的IPv6CP报文，所述IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN。
  8. 根据权利要求7所述的终端，其中，所述配置单元，还配置为将所述新选项配置为IPv6CP的非关键选项。
  9. 根据权利要求8所述的终端，其中，所述请求单元，还配置为在终端与服务器之间重新进行NCP协商时，在所述NCP协商过程中，向服务器发送IPv6CP请求报文，所述IPv6CP请求报文中所述新选项为空。
  10. 根据权利要求7所述的终端，其中，在组网环境必支持双栈演进 DSLite的情况下或者组网环境根本不可能存在服务器不能提供FQDN的情况下，所述配置单元，还配置为将所述新选项配置为IPv6CP的关键选项。
  11. 一种服务器，所述服务器包括：
    响应单元，配置为在组网环境从不支持双栈演进DSLite切换到支持DSLite并且需要IPv6与IPv4之间过渡时，不响应终端发送的饱和请求报文；
    复位单元，配置为在所述响应单元不响应的次数超过指定次数时，链路复位，与终端之间重新进行链路控制协议LCP和网络控制协议NCP协商。
  12. 根据权利要求11所述的服务器，其中：所述响应单元，还配置为根据不同地址段分批不响应饱和请求报文。
  13. 一种终端，所述终端包括：
    配置单元，配置为在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN；
    请求单元，配置为向服务器发送IPv6CP请求报文，所述IPv6CP请求报文中所述新选项为空；
    接收单元，配置为接收服务器返回的IPv6CP报文，所述IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN；
    隧道建立单元，配置为解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
  14. 一种双栈隧道建立系统，所述系统包括终端和服务器；
    所述终端包括：
    配置单元，配置为在IPv6CP报文预定义一个新选项，所述新选项用于承载FQDN，将所述新选项配置为IPv6CP的非关键选项；
    请求单元，配置为向服务器发送IPv6CP请求报文，所述IPv6CP请求 报文中所述新选项为空；
    接收单元，配置为在终端与服务器之间的NCP协商过程中，接收服务器返回的IPv6CP报文，所述IPv6CP报文中所述新选项承载有建立IPv6与IPv4间双栈隧道所需的FQDN；
    所述服务器包括：响应单元，配置为当前环境下需要IPv6与IPv4之间过渡时，不响应终端发送的饱和请求报文；复位单元，配置为在所述响应单元不响应的次数超过指定次数时，链路复位，与终端之间重新进行链路控制协议LCP和网络控制协议NCP协商。
  15. 根据权利要求14所述的系统，其中：所述终端还包括：隧道建立单元，配置为解析所述新选项中的FQDN得到隧道终结点地址，并解析所述IPv6地址字段得到IPv6地址，基于所述隧道终结点地址和IPv6地址建立IPv6与IPv4间的双栈隧道。
  16. 一种计算机可读介质，所述计算机可读介质中存储有可执行指令，所述可执行指令用于执行权利要求1至5任一项所述的获取隧道终结点域名FQDN的方法。
  17. 一种计算机可读介质，所述计算机可读介质中存储有可执行指令，所述可执行指令用于执行权利要求6所述的建立双栈隧道的方法。
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