WO2011072549A1 - 非lisp站点与lisp站点通信的方法、装置及系统 - Google Patents

非lisp站点与lisp站点通信的方法、装置及系统 Download PDF

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Publication number
WO2011072549A1
WO2011072549A1 PCT/CN2010/077810 CN2010077810W WO2011072549A1 WO 2011072549 A1 WO2011072549 A1 WO 2011072549A1 CN 2010077810 W CN2010077810 W CN 2010077810W WO 2011072549 A1 WO2011072549 A1 WO 2011072549A1
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lisp
network
dns
identifier
site
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PCT/CN2010/077810
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English (en)
French (fr)
Inventor
徐小虎
王雪伟
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华为技术有限公司
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Publication of WO2011072549A1 publication Critical patent/WO2011072549A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/09Mapping addresses
    • H04L61/10Mapping addresses of different types
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements, protocols or services for addressing or naming
    • H04L61/45Network directories; Name-to-address mapping
    • H04L61/4505Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]

Definitions

  • the present application claims a method for the communication of a non-LISP site and a LISP site, which is filed on December 17, 2009, and whose application number is 200910222984.7. Priority of the application, the entire contents of which are incorporated herein by reference.
  • the present invention relates to the field of communications technologies, and in particular, to a method for communicating between a non-LISP site and a LISP site, and a device and system for a LISP site network. Background technique
  • LISP Licator Identifier Split Protocol
  • the site network Separating the site network (usually the user network) from the transport network (usually the carrier network), the routing information inside the site network is not released to the transport network, and the two site networks pass the ITR (Ingress Tunnel Router) and The ETR (Egress Tunnel Router) establishes a tunnel traversing the transport network, and the site network implements an EID (Endpoint Identifier, which represents the address inside the site network) through a separate distributed database.
  • >RL0C Ring Locator, routing location identifier, indicating the maintenance of the mapping information of the border router in the transport network).
  • Embodiments of the present invention provide a method for communicating between a non-LISP site and a LISP site, a device and a system for a LISP site network, thereby implementing a non-LISP site network access to the LISP site network simply and at low cost.
  • a method for communicating with a LISP site by a non-LISP site including:
  • ETR egress site router ETR is a non-LISP site.
  • the destination host requested by the DNS request message is assigned a routable address in the transport network.
  • the ETR establishes a correspondence between an endpoint identifier EID of the destination host and a routable address in the transport network;
  • the ETR sends a routable address in the transport network to the non-LISP site network side.
  • An egress tunnel router ETR in a LISP site network including:
  • An address allocation module configured to allocate a routable address in the transport network to the destination host of the DNS request message sent by the network side of the non-LISP site;
  • mapping establishing module configured to establish a correspondence between an endpoint identifier EID of the destination host and a routable address in the transport network
  • a message sending module configured to send, to the non-LISP site network side, a routable address in the transport network.
  • a LISP site network system including a DNS server and an egress tunnel router ETR:
  • the DNS server is configured to receive the LISP identifier or the non-LISP identifier in the received DNS request packet. Copying to the DNS response message, and sending the DNS response message to the ETR; the ETR is the ETR according to any one of the preceding claims 7-9, and according to whether the DNS response message is The LISP identifier or the non-LISP identifier is used to determine whether the LISP identifier or the non-LISP identifier is included in the DNS request packet received by the LISP site network.
  • the ETR allocates an address routable in the transport network to the destination host, and establishes the routable address and the EID of the destination host.
  • FIG. 1 is a schematic diagram of a processing procedure according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a processing procedure according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of a processing procedure according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic structural diagram of an ETR according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a system according to an embodiment of the present invention.
  • the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, instead of All embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
  • the embodiment of the invention provides a method for implementing communication between a non-LISP site network and a LISP site network.
  • the method is as shown in FIG. 1 , and the specific implementation manner is as follows:
  • the ETR in the network of the LISP site allocates a routable address in the transport network for the destination host requested by the DNS (Domain Name System) request packet sent by the network side of the non-LISP site;
  • DNS Domain Name System
  • the ETR establishes a one-to-one correspondence between an EID of the destination host and a routable address in the transport network.
  • the ETR sends the routable network in the transport network to the non-LISP site network side.
  • the correspondence between the EID and the routable address in the transport network is unique, that is, an E ID uniquely corresponds to a routable address in the transport network.
  • the method may be: replacing the EID of the destination host carried in the DNS response message returned to the non-LISP site network side with the address routable in the transport network.
  • the DNS response packet is the packet that the DNS server returns with the destination host A/AAAA (host address in DNS or IPv6 host address IPv6, Internet Protocol Version 6, version 6 Internet Protocol).
  • the ETR in the network of the LISP site allocates a routable address in the transport network for the destination host accessed by the network side of the non-LISP site, and establishes a routable address in the transport network and the destination host.
  • the correspondence between EIDs is used to implement non-LISP site network access to the LISP site network. There is no need to add hardware such as PTR to the network, which effectively reduces the implementation and reduces the implementation cost.
  • the embodiment of the present invention is also The DNS request packet is extended.
  • the network information of the LISP site that initiates the access may be added to the DNS request packet to indicate that the DNS request packet is from the LISP site network or the non-LISP that initiates the access.
  • the identifier information is added to the DNS request packet to indicate that the DNS request packet is from the non-LISP site network, or the identifier information is added to the DNS request packet from the LISP site network and the non-LISP site network.
  • a preferred implementation manner is recommended in the embodiment of the present invention, that is, only the DNS request packet from the LISP site network is extended, so that when the non-LISP site network accesses the LISP site network, the non-LISP site network does not need to perform any software,
  • the hardware modification only extends the network of the LISP site in the network.
  • the LISP tag can be specifically set by the DNS resolver or ITR in the network of the sender LISP site. If set by the ITR, It is also necessary to extend the ITR, and add a DNS-ALG (Application Layer Gateway) function module to the ITR, and the function module adds identification information to the DNS request message.
  • DNS-ALG Application Layer Gateway
  • the non-LISP tag may be specifically set by the DNS resolver or the border router BR in the non-LISP site network of the sending end, if set by the border router, The border router needs to be extended, and a DNS-ALG function module is added to the border router, and the function module adds identification information to the DNS request message.
  • the method for extending the DNS request packet from the LISP site network is as follows: Adding the identifier information to the DNS request packet is as follows: (1) Extending the Opcode in the DNS request packet header to define a new OPcode
  • the opcode (for example, named Behind ITR, hereinafter referred to as Bl Opcode) is used to identify that the DNS request message is from the LISP site network. Since the value of 0 to 2 of OPcode in the header of the DNS request message has been defined, BI Opcode can be defined by any value between 3 and 15.
  • Bl Z can be defined by any value between 0 and 15 of Z.
  • the method provided by the embodiment of the present invention further includes identifying a DNS request packet from the non-LISP site network, and the specific implementation manner is: if the pair is from the LISP site If the DNS request packet of the network is extended, it is determined whether the received DNS request packet includes the LISP identifier, and the LISP identifier is used to mark the DNS request packet from the sender LISP site network, that is, the extended DNS request packet.
  • the identification information in the text if the DNS request message does not include the LISP identifier, it is identified that the DNS request message is from a non-LISP site network; if the DNS request from the non-LISP site network is extended, the received Whether the non-LISP identifier is included in the DNS request packet, and the non-LISP identifier is used to mark the DNS request packet from the non-LISP site network of the sending end, that is, the identification information in the extended DNS request packet; if the DNS request is reported The non-LISP identifier is included in the text, and the DNS request message is identified as coming from a non-LISP site network.
  • the corresponding DNS request message is from the LISP site network, and the communication between the LISP site networks can be implemented according to the existing routing manner.
  • the ETR forwards the received DNS request packet to the DNS server in the network of the LISP site. After the DNS server obtains the DNS request packet, the DNS server carries the DNS request packet. The LISP identification information or the non-LISP identification information is copied into the DNS response message. The ETR can determine whether the DNS request message is included by determining whether the DNS response message returned by the DNS server in the network to the sender includes the LISP flag or the non-LISP flag. Whether the text contains LISP tags or non-LISP tags.
  • the method provided by the embodiment of the present invention may further include: the ETR receiving the communication packet sent by the non-LISP site network side, where the destination address in the communication packet is a routable system in the transport network, and forwarding the packet Give the destination host.
  • the non-LISP site network accesses the LISP site network.
  • the DNS packet in the LISP site network is extended, and Bl Opcode (or Bl Z) is set in the DNS request packet to identify the corresponding DNS request from the LISP site network, and to the LISP.
  • the ETR in the site network is set up to identify and process extended DNS request packets.
  • the ITR or DNS resolver in the LISP site network can be configured to extend the DNS packets and add LISP identification information. .
  • the specific processing process is as shown in FIG. 2, including the following operations:
  • host a initiates a DNS request packet to host b to request A/AAAA resource record of host b. If site network A is a LISP site network, perform S202. If site network A is a non-LISP site network, perform S203. ;
  • the DNS resolver or ITR of the site network A obtains the DNS request packet initiated by the host a, and sets the Bl Opcode (or Bl Z) identifier information for the DNS request packet, which is used to identify that the DNS request packet is from the LISP.
  • the site network, and then the ITR sends the extended DNS request message to the site network B through the delivery network, and proceeds to S204;
  • the DNS resolver of the site network A obtains the DNS request packet initiated by the host a, and forwards it to the site network B through the transport network, and proceeds to S204;
  • the ETR in the site network B forwards the received DNS request packet to the DNS server in the site network B.
  • the DNS server identifies the destination host information requested in the DNS request packet (the destination host is the host b), and returns the EID of the host b to the host a in the site network A through the DNS response packet, if the DNS request packet is carried in the packet.
  • Bl Opcode (or Bl Z ) identification information and also copy the Bl Opcode (or BI Z ) identification information in the DNS request message into the DNS response message;
  • the ETR in the site network B obtains the foregoing DNS response packet, and determines whether the DNS response packet carries the information of the Bl Opcode (or the Bl Z). If the packet is carried, the DNS response packet is forwarded to the site network A. Not carried, indicating that the corresponding DNS request message is from a non-LISP site network.
  • the ETR allocates a routable address in the transport network from the external address pool to the host b, establishes a correspondence between the routable address in the transport network and the EID of the destination host b, and uses the routable in the transport network. The address is replaced by the EID of the host b carried in the DNS response packet, and the DNS response packet is sent to the site network A;
  • the host a sends a communication packet to the host b according to the EID of the host b carried in the received DNS response packet or the routable address in the transmission network.
  • the ETR of the site network B obtains the communication packet sent by the host a. If the site network A is a non-LISP site network, according to the one-to-one correspondence between the EID established in S206 and the routable address in the transport network, The communication message is forwarded to the host b. If the site network A is a LISP site network, the communication is performed according to the communication mode between the existing LISP site networks. The one-to-one correspondence between the two is stored in the E ID and RLOC relationship mapping table.
  • the ETR in the network of the LISP site allocates a routable address in the transport network for the destination host accessed by the network side of the non-LISP site, and establishes a routable address in the transport network and the destination.
  • the correspondence between the EIDs of the hosts is used to implement non-LISP site network access to the LISP site network.
  • implementation complexity and cost of implementation are further reduced by requiring only changes to the LISP site network without any changes to the software and hardware of the non-LISP site network.
  • the DNS packet in the non-LISP site network is extended, and the identifier information is set in the DNS request packet to identify that the corresponding DNS request is from the non-LISP site network, and the non-LISP site network is used.
  • the DNS resolver is configured to extend the DNS request message and set the ETR in the LISP site network to identify extended DNS packets and It is processed. Then, when the host a in the site network A initiates communication to the host b in the LISP site network B, the specific processing procedure is as shown in FIG. 3, and includes the following operations:
  • the host a initiates a DNS request packet to the host b to request the A/AAAA resource record of the host b. If the site network A is a non-LISP site network, perform S302. If the site network A is a LISP site network, execute S303. ;
  • the DNS resolver or the BR of the site network A obtains the DNS request packet initiated by the host a, and sets the identifier information for the DNS request packet, which is used to identify the DNS request packet from the non-LISP site network, and then the BR Sending the extended DNS request packet to the site network B through the transport network, and proceeding to S304;
  • the DNS resolver of the site network A obtains the DNS request packet initiated by the host a, and forwards it to the site network B through the transport network, and proceeds to S304;
  • the ETR in the site network B forwards the received DNS request packet to the DNS server in the site network B.
  • the DNS server identifies the destination host information requested in the DNS request packet (the destination host is the host b), and returns the EID of the host b to the host a in the site network A through the DNS response packet, if the DNS request packet is carried in the packet.
  • the identification information is also copied into the DNS response packet by the identifier information in the DNS request packet;
  • the ETR in the site network B obtains the foregoing DNS response packet, and determines whether the DNS response packet carries the identifier information. If the packet is carried, it indicates that the corresponding DNS request packet is from the non-LISP site network, and the ETR is from the external address pool.
  • the host b allocates a routable address in the transport network, establishes a correspondence between the routable address in the transport network and the EID of the host b, and replaces the carried in the DNS response message with the routable address in the transport network. After the EID of the host b, the DNS response packet is sent to the site network A. If not, the DNS response packet is forwarded to the site network A;
  • the host a sends a communication packet to the host b according to the EID of the host b carried in the received DNS response packet or the routable address in the transmission network.
  • the ETR of the site network B acquires the communication message sent by the host a. If the site network A is a non-LISP site network, according to the one-to-one correspondence between the EID established in S306 and the routable address in the transmission network, The communication message is forwarded to the host b. If the site network A is a LISP site network, the communication is performed according to the communication mode between the existing LISP site networks. The one-to-one correspondence between the two is stored in the E ID and RLOC relationship mapping table.
  • the ETR in the LISP site network allocates a routable address in the transport network for the destination host accessed by the network side of the non-LISP site, and establishes a routable address in the transport network and the destination.
  • the correspondence between the EIDs of the hosts is used to implement non-LISP site network access to the LISP site network. There is no need to add hardware such as PTR to the network, which effectively reduces implementation difficulties and reduces implementation costs.
  • the foregoing program may be stored in a computer readable storage medium, and when executed, the program includes the steps of the foregoing method embodiments;
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.
  • the embodiment of the present invention further provides an egress router router ETR in a network of a LISP site, and the implementation structure thereof is as shown in FIG. 4.
  • the specific implementation structure includes: an address allocation module (401), configured to send the network side of the non-LISP site.
  • the destination host requested by the DNS request message is assigned a routable address in the transport network;
  • the mapping establishment module (402) is configured to establish a correspondence between the EID of the destination host and the routable address in the transport network;
  • the sending module (403) is configured to send, to the non-LISP site network side, a routable address in the transport network.
  • the foregoing ETR provided by the embodiment of the present invention can allocate a routable address in the transport network for the destination host accessed by the network side of the non-LISP site, and establish a routable address between the transport network and the EID of the destination host.
  • - Correspondence to achieve non-LISP site network access to the LISP site network. There is no need to add hardware such as PTR to the network, thus effectively reducing the implementation difficulty. And reduce the implementation cost.
  • the ETR provided by the embodiment of the present invention may further include an identification module (404), configured to determine whether a DNS request packet received by the LISP site network includes a LISP identifier or a non-LISP identifier, and the LISP identifier is used to mark the DNS request packet from the sending.
  • the LISP site network, the non-LISP identifier is used to mark the DNS request packet from the non-LISP site network of the sending end; if the DNS request packet includes the non-LISP identifier or does not include the LISP identifier, the DNS request packet is identified.
  • the non-LISP site network determines the destination host of the DNS request message request according to the destination host address requested in the DNS request message.
  • the ETR forwards the received DNS request packet to the DNS server in the network of the LISP site.
  • the DNS server After the DNS server obtains the DNS request packet, the DNS server carries the DNS request packet.
  • the LISP identification information or the non-LISP identification information is copied into the DNS response message, and the identification module (404) in the ETR can determine whether the DNS response message returned by the DNS server in the network to the sender includes the LISP flag or the non-LISP. Mark to determine whether the DNS request message contains a LISP tag or a non-LISP tag.
  • the ETR replaces the EID in the DNS response message with the routable address in the transport network.
  • the ETR provided by the embodiment of the present invention may further include a message forwarding module (405) for forwarding the EID of the destination host established by the mapping establishment module (402) and the address of the routable address in the transport network. Give the destination host.
  • a message forwarding module (405) for forwarding the EID of the destination host established by the mapping establishment module (402) and the address of the routable address in the transport network. Give the destination host.
  • the embodiment of the present invention further provides a LISP site network system, and its structure is shown in FIG. 5.
  • the specific implementation structure includes a DNS server (51) and an egress tunnel router ETR (52).
  • the DNS server (51) is configured to copy the LISP identifier or the non-LISP identifier in the received DNS request packet into the DNS response packet, and send the DNS response packet to the ETR (52); ETR (52)
  • the ETR (52) may also determine whether the LISP identifier received by the LISP site network includes the LISP identifier according to whether the DNS response packet includes the LISP identifier or the non-LISP identifier. Or non-LISP logo.
  • the specific communication manner between the DNS server (51) and the ETR (52) can be referred to the description of the foregoing method embodiment.
  • the ETR in the network of the LISP site allocates a routable address in the transport network for the destination host accessed by the network side of the non-LISP site, and establishes the transmission.
  • LISP site network access LISP site network. There is no need to add hardware such as PTR to the network, thus effectively reducing the implementation difficulty and reducing the implementation cost.

Description

非 LISP站点与 LISP站点通信的方法、 装置及系统 本申请要求了 2009年 12月 17日提交的, 申请号为 200910222984.7发明 名称为 "非 LISP站点与 LISP站点通信的方法、 装置及系统" 的中国申请的优 先权, 其全部内容通过引用结合在本申请中。 技术领域 本发明实施例涉及通信技术领域,尤其涉及一种非 LISP站点与 LISP站点通 信的方法、 LISP站点网络的装置及系统。 背景技术
LISP ( Locator Identifier Split Protocol , 位置与标识分离协议)是一种基 于主机身份标识与主机位置标识分离的解决方案, 其实现方式如下:
将站点网络(通常指用户网络)与传送网络(通常指运营商网络)分离, 站点网络内部的路由信息不发布到传送网络中,两个站点网络通过 ITR( Ingress Tunnel Router, 入口隧道路由器)和 ETR ( Egress Tunnel Router, 出口隧道 路由器)之间建立的穿越传送网络的隧道进行连接, 且站点网络通过一个单独 的分布式数据库实现 EID ( Endpoint Identifier, 端点标识符, 表示站点网络内 部的地址) ->RL0C ( Routing Locator, 路由位置符, 表示边界路由器在传送 网络内的可达地址) 的映射信息的维护。
由于对 LISP的部署不是一蹴而就的, 现网中既有 LISP站点网络, 也有非 LISP站点网络, 因此需要实现非 LISP站点网络到 LISP站点网络的访问。 现有 的解决方案是通过 PTR( Proxy Tunnel Router,代理隧道路由器)转发从非 LISP 站点网络到 LISP站点网络的报文。 发明人在实现本发明的过程中, 发现现有技术中至少存在如下问题: 络中部署大量的 PTR。 而在实际部署过程中, 很难实现大量 PTR的增量部署, 且实现成本较高。 发明内容
本发明的实施例提供了一种非 LISP站点与 LISP站点通信的方法、 LISP站 点网络的装置及系统,从而简单、低成本地实现非 LISP站点网络访问 LISP站点 网络。
本发明的目的是通过以下技术方案实现的:
一种非 LISP站点与 LISP站点通信的方法, 包括:
位置与标识分离协议 LISP站点网络中的出口隧道路由器 ETR为非 LISP站 点网络侧发送的域名系统 DNS请求报文请求的目的主机分配一个传送网络中 可路由的地址;
所述 ETR建立所述目的主机的端点标识符 EID与所述传送网络中可路由的 地址的——对应关系;
所述 ETR向所述非 LISP站点网络侧发送所述传送网络中可路由的地址。 一种 LISP站点网络中的出口隧道路由器 ETR, 包括:
地址分配模块,用于为非 LISP站点网络侧发送的 DNS请求报文请求的目的 主机分配一个传送网络中可路由的地址;
映射建立模块, 用于建立所述目的主机的端点标识 EID与所述传送网络中 可路由的地址的——对应关系;
报文发送模块,用于向所述非 LISP站点网络侧发送所述传送网络中可路由 的地址。
一种 LISP站点网络系统, 包括 DNS服务器和出口隧道路由器 ETR:
所述 DNS服务器用于将接收的 DNS请求报文中的 LISP标识或非 LISP标识 复制到 DNS回应报文中, 并将所述 DNS回应报文发送给所述 ETR; 所述 ETR为上述权利要求 7 ~ 9任意一项所述的 ETR,并根据所述 DNS回应 报文中是否包含 LISP标识或非 LISP标识判断所述 LISP站点网络接收的 DNS请 求报文中是否包含 LISP标识或非 LISP标识。
由上述本发明实施例提供的技术方案可以看出, 本发明实施例中, 由于 ETR通过为目的主机分配一个在传送网络中可路由的地址, 并建立该可路由的 地址与该目的主机的 EID之间的——对应关系, 以便非 LISP站点网络通过分配 给 LISP站点网络中的目的主机的可路由地址访问该目的主机,从而实现非 LISP 站点网络访问 LISP站点网络。 无需在网络中增加诸如 PTR之类的硬件, 因此有 效降低了实现难度, 并降低了实现成本。
附图说明 为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中所 需要使用的附图作一简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发 明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动性的前 提下, 还可以根据这些附图获得其他的附图。
图 1为本发明实施例提供的处理过程示意图;
图 2为本发明实施例一提供的处理过程示意图;
图 3为本发明实施例二提供的处理过程示意图;
图 4为本发明实施例提供的 ETR结构示意图;
图 5为本发明实施例提供的系统结构示意图。 具体实施方式 下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。 基于本发明中的实施例, 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。
本发明实施例提供了一种实现非 LISP站点网络与 LISP站点网络之间通信 的方法, 该方法如图 1所示, 具体实现方式如下:
5101、 LISP站点网络中的 ETR为非 LISP站点网络侧发送的 DNS ( Domain Name System, 域名系统 )请求报文请求的目的主机分配一个在传送网络中可 路由的地址;
5102、 该 ETR建立该目的主机的 EID与上述传送网络中可路由的地址的一 一对应关系;
5103、 该 ETR向上述非 LISP站点网络侧发送上述传送网络中可路由的地 络。
其中, 上述 EID与传送网络中可路由的地址的——对应关系是唯一的, 即 一个 E ID唯一对应一个传送网络中可路由的地址。 方式可以是:将返回给所述非 LISP站点网络侧的 DNS回应报文中携带的目的主 机的 EID替换为上述在传送网络中可路由的地址。 DNS回应报文为 DNS服务器 返回的携带目的主机 A/AAAA ( DNS中的主机地址或 IPv6的主机地址 IPv6, Internet Protocol Version 6, 版本号为 6的互联网协议 ) 资源记录的报文。
上述本发明实施例中, LISP站点网络中的 ETR通过为非 LISP站点网络侧访 问的目的主机分配一个在传送网络中可路由的地址, 并建立该传送网络中可路 由的地址与该目的主机的 EID之间的——对应关系, 来实现非 LISP站点网络访 问 LISP站点网络。 无需在网络中增加诸如 PTR之类的硬件, 因此有效降低了实 现难度, 并降低了实现成本。
为了识别非 LISP站点网络侧发送的 DNS请求报文, 本发明实施例中还对 DNS请求报文进行了扩展, 具体可以在发起访问的 LISP站点网络侧, 在 DNS 请求报文中增加标识信息, 用来表示 DNS请求报文来自于 LISP站点网络,也可 以在发起访问的非 LISP站点网络侧, 在 DNS请求报文中增加标识信息, 用来表 示 DNS请求报文来自于非 LISP站点网络, 或者对来自于 LISP站点网络和非 LISP站点网络的 DNS请求报文均增加标识信息。本发明实施例中推荐一种优选 的实现方式, 即仅对来自 LISP站点网络的 DNS请求报文进行扩展,从而使得非 LISP站点网络访问 LISP站点网络时, 非 LISP站点网络不需要进行任何软件、 硬件上的修改, 仅对网络中的 LISP站点网络进行扩展, 在这种优选的实现方式 中, LISP标记具体可以由发送端 LISP站点网络中的 DNS解析器或 ITR设置, 如 果由 ITR进行设置,还需要对 ITR进行扩展,在 ITR中增加 DNS-ALG( Application Layer Gateway, 应用层网关) 功能模块, 由该功能模块在 DNS请求报文中增 加标识信息。 在对非 LISP站点网络侧的 DNS请求报文进行扩展的实现方式中, 非 LISP标记具体可以由发送端非 LISP站点网络中的 DNS解析器或边界路由器 BR设置, 如果由边界路由器进行设置, 还需要对边界路由器进行扩展, 在边界 路由器中增加 DNS-ALG功能模块, 由该功能模块在 DNS请求报文中增加标识 信息。
以对来自 LISP站点网络的 DNS请求报文进行扩展为例,在 DNS请求报文中 增加标识信息具体实现方式如下: (一 )对 DNS请求报文头中 Opcode进行扩 展, 定义 OPcode的一种新操作码 (例如, 命名为 Behind ITR, 以下简称 Bl Opcode ) , 用来标识 DNS请求报文来自于 LISP站点网络。 由于 DNS请求报文 头中 OPcode的 0 ~ 2的取值已经被定义,因此可在 3 ~ 15之间的任意一个取值来 定义 BI Opcode。 (二)对 DNS请求报文头中操作码 Z进行扩展, 定义 Z的一种 新操作码 (例如, 命名为 Behind ITR, 以下简称 BI Z ) , 用来标识 DNS请求报 文来自于 LISP站点网络, 可以可在 Z的取值 0 ~ 15之间的任意一个取值来定义 Bl Z。 相应的, 在 ETR为上述目的主机分配传送网络中可路由的地址之前, 本发 明实施例提供的方法还包括识别来自非 LISP站点网络的 DNS请求报文,具体实 现方式是: 如果对来自 LISP站点网络的 DNS请求报文进行扩展, 则判断接收的 DNS请求报文中是否包含 LISP标识, LISP标识用来标记所述 DNS请求报文来 自于发送端 LISP站点网络, 即上述扩展后的 DNS请求报文中的识别信息; 如果 DNS请求报文中不包含 LISP标识, 则识别出所述 DNS请求报文来自于非 LISP 站点网络; 如果对来自非 LISP站点网络的 DNS请求进行扩展, 则判断接收的 DNS请求报文中是否包含非 LISP标识, 非 LISP标识用来标记所述 DNS请求报 文来自于发送端非 LISP站点网络, 即上述扩展后的 DNS请求报文中的识别信 息;如果 DNS请求报文中包含非 LISP标识,则识别出所述 DNS请求报文来自于 非 LISP站点网络。 如果接收的 DNS请求报文中包含 LISP标记或不包含非 LISP 标记, 则相应的 DNS请求报文来自于 LISP站点网络, 可按照现有的路由方式实 现 LISP站点网络之间的通信。其中,在具体应用过程中, ETR会将接收到的 DNS 请求报文转发给所在的 LISP站点网络中的 DNS服务器,该 DNS服务器在获取上 述 DNS请求报文后, 将 DNS请求报文中携带的 LISP标识信息或非 LISP标识信 息复制到 DNS回应报文中, ETR具体可以通过判断本网络中的 DNS服务器返回 给发送端的 DNS回应报文中是否包含 LISP标记或非 LISP标记, 来判断 DNS请 求报文中是否包含 LISP标记或非 LISP标记。
上述本发明实施例提供的方法还可以包括:上述 ETR接收上述非 LISP站点 网络侧发送的通信报文, 该通信报文中的目的地址为上述传送网络中可路由的 系,将该报文转发给所述目的主机。从而实现非 LISP站点网络访问 LISP站点网 络。 实施例一
在本发明实施例一中,对 LISP站点网络中 DNS报文进行扩展,在 DNS请求 报文中设置 Bl Opcode (或 Bl Z ) , 用来标识相应的 DNS请求来自于 LISP站点 网络, 并对 LISP站点网络中的 ETR进行设置,使其能够识别扩展的 DNS请求报 文并进行处理, 对 LISP站点网络中的 ITR或 DNS解析器进行设置, 使其能够对 DNS报文进行扩展, 增加 LISP标识信息。 则, 当站点网络 A中的主机 a向 LISP 站点网络 B中的主机 b发起通信时, 具体处理过程如图 2所示, 包括如下操作:
5201、 主机 a向主机 b发起 DNS请求报文, 以请求主机 b的 A/AAAA资源记 录, 如果站点网络 A为 LISP站点网络, 则执行 S202, 如果站点网络 A为非 LISP 站点网络, 则执行 S203;
5202、站点网络 A的 DNS解析器或 ITR获取主机 a发起的 DNS请求报文,并 为该 DNS请求报文设置 Bl Opcode (或 Bl Z )标识信息, 用来标识该 DNS请求 报文来自于 LISP站点网络, 然后由 ITR将扩展后的 DNS请求报文通过传送网络 发送给站点网络 B, 进入 S204;
5203、 站点网络 A的 DNS解析器获取主机 a发起的 DNS请求报文, 并通过 传送网络转发给站点网络 B, 进入 S204;
5204、 站点网络 B中的 ETR将接收到的 DNS请求报文转发给站点网络 B中 的 DNS服务器;
5205、 DNS服务器识别 DNS请求报文中请求的目的主机信息 (目的主机 为主机 b ), 将主机 b的 EID通过 DNS回应报文返回给站点网络 A中的主机 a, 如 果 DNS请求报文中携带 Bl Opcode (或 Bl Z )标识信息, 还将 DNS请求报文中 的 Bl Opcode (或 BI Z )标识信息复制到该 DNS回应报文中;
5206、 站点网络 B中的 ETR获取上述 DNS回应报文, 判断 DNS回应报文中 是否携带 Bl Opcode (或 Bl Z )标识信息, 如果携带, 则将该 DNS回应报文转 发给站点网络 A, 如果未携带, 表示相应的 DNS请求报文来自于非 LISP站点网 络, ETR从外部地址池中为主机 b分配一个传送网络中可路由的地址, 建立该 传送网络中可路由的地址与目的主机 b的 E I D的——对应关系,并用该传送网络 中可路由的地址替换掉 DNS回应报文中携带的主机 b的 EID后将 DNS回应报文 发送给站点网络 A;
5207、主机 a根据接收到的 DNS回应报文中携带的主机 b的 EID或传送网络 中可路由的地址, 向主机 b发送通信报文;
5208、 站点网络 B的 ETR获取主机 a发送的通信报文, 如果站点网络 A是非 LISP站点网络,则根据 S206中建立的 EID与传送网络中可路由的地址之间的一 一对应关系, 将该通信报文转发给主机 b, 如果站点网络 A是 LISP站点网络, 则 根据现有的 LISP站点网络之间的通信方式进行处理。 间的一一对应关系保存在 E ID与 RLOC关系映射表中。
本发明实施例一提供的方法, LISP站点网络中的 ETR通过为非 LISP站点网 络侧访问的目的主机分配一个在传送网络中可路由的地址, 并建立该传送网络 中可路由的地址与该目的主机的 EID之间的——对应关系, 来实现非 LISP站点 网络访问 LISP站点网络。 无需在网络中增加诸如 PTR之类的硬件, 因此有效降 低了实现难度, 并降低了实现成本。 另外, 由于仅需要对 LISP站点网络进行修 改, 而无需对非 LISP站点网络的软件和硬件进行任何改变, 进一步降低了实现 复杂度以及实现成本。
实施例二
在本发明实施例二中, 对非 LISP站点网络中 DNS报文进行扩展, 在 DNS 请求报文中设置标识信息, 用来标识相应的 DNS请求来自于非 LISP站点网络, 并对非 LISP站点网络中的 DNS解析器进行设置,使其能够对 DNS请求报文进行 扩展,对 LISP站点网络中的 ETR进行设置,使其能够识别扩展的 DNS报文并对 其进行处理。 则, 当站点网络 A中的主机 a向 LISP站点网络 B中的主机 b发起通 信时, 具体处理过程如图 3所示, 包括如下操作:
5301、 主机 a向主机 b发起 DNS请求报文, 以请求主机 b的 A/AAAA资源记 录, 如果站点网络 A为非 LISP站点网络, 则执行 S302, 如果站点网络 A为 LISP 站点网络, 则执行 S303;
5302、 站点网络 A的 DNS解析器或者 BR获取主机 a发起的 DNS请求报文, 并为该 DNS请求报文设置标识信息, 用来标识该 DNS请求报文来自于非 LISP 站点网络, 然后由 BR将扩展后的 DNS请求报文通过传送网络发送给站点网络 B, 进入 S304;
5303、 站点网络 A的 DNS解析器获取主机 a发起的 DNS请求报文, 并通过 传送网络转发给站点网络 B, 进入 S304;
5304、 站点网络 B中的 ETR将接收到的 DNS请求报文转发给站点网络 B中 的 DNS服务器;
5305、 DNS服务器识别 DNS请求报文中请求的目的主机信息 (目的主机 为主机 b ), 将主机 b的 EID通过 DNS回应报文返回给站点网络 A中的主机 a, 如 果 DNS请求报文中携带标识信息, 还将 DNS请求报文中的标识信息复制到该 DNS回应报文中;
5306、 站点网络 B中的 ETR获取上述 DNS回应报文, 判断 DNS回应报文中 是否携带标识信息, 如果携带,表示相应的 DNS请求报文来自于非 LISP站点网 络, ETR从外部地址池中为主机 b分配一个传送网络中可路由的地址, 建立该 传送网络中可路由的地址与主机 b的 EID的——对应关系,并用该传送网络中可 路由的地址替换掉 DNS回应报文中携带的主机 b的 EID后将 DNS回应报文发送 给站点网络 A, 如果未携带, 则将 DNS回应报文转发给站点网络 A;
5307、主机 a根据接收到的 DNS回应报文中携带的主机 b的 EID或传送网络 中可路由的地址, 向主机 b发送通信报文; S308、 站点网络 B的 ETR获取主机 a发送的通信报文, 如果站点网络 A是非 LISP站点网络,则根据 S306中建立的 EID与传送网络中可路由的地址之间的一 一对应关系, 将该通信报文转发给主机 b, 如果站点网络 A是 LISP站点网络, 则 根据现有的 LISP站点网络之间的通信方式进行处理。 间的一一对应关系保存在 E ID与 RLOC关系映射表中。
本发明实施例二提供的方法, LISP站点网络中的 ETR通过为非 LISP站点网 络侧访问的目的主机分配一个在传送网络中可路由的地址, 并建立该传送网络 中可路由的地址与该目的主机的 EID之间的——对应关系, 来实现非 LISP站点 网络访问 LISP站点网络。 无需在网络中增加诸如 PTR之类的硬件, 因此有效降 低了实现难度, 并降低了实现成本。
实现上述方法实施例的全部或部分步骤可以通过程序指令相关的硬件来 完成, 前述的程序可以存储于一计算机可读取存储介质中, 该程序在执行时, 执行包括上述方法实施例的步骤; 而前述的存储介质包括: ROM、 RAM, 磁 碟或者光盘等各种可以存储程序代码的介质。
本发明实施例还提供了一种 LISP站点网络中的出口隧道路由器 ETR,其实 现结构如图 4所示, 具体实现结构包括: 地址分配模块(401 ), 用于为非 LISP 站点网络侧发送的 DNS请求报文请求的目的主机分配一个传送网络中可路由 的地址; 映射建立模块(402 ), 用于建立该目的主机的 EID与上述传送网络中 可路由的地址的——对应关系; 报文发送模块 (403 ) , 用于向上述非 LISP站 点网络侧发送所述传送网络中可路由的地址。
上述本发明实施例提供的 ETR,可以通过为非 LISP站点网络侧访问的目的 主机分配一个在传送网络中可路由的地址, 并建立该传送网络中可路由的地址 与该目的主机的 EID之间的——对应关系, 来实现非 LISP站点网络访问 LISP站 点网络。 无需在网络中增加诸如 PTR之类的硬件, 因此有效降低了实现难度, 并降低了实现成本。
本发明实施例提供的 ETR还可以包括识别模块(404 ) , 用于判断 LISP站 点网络接收的 DNS请求报文中是否包含 LISP标识或非 LISP标识, LISP标识用 来标记 DNS请求报文来自于发送端 LISP站点网络, 非 LISP标识用来标记 DNS 请求报文来自于发送端非 LISP站点网络; 如果上述 DNS请求报文中包含非 LISP标识或者不包含 LISP标识, 则识别出所述 DNS请求报文来自于非 LISP站 点网络,根据所述 DNS请求报文中请求的目的主机地址确定所述 DNS请求报文 请求的目的主机。 其中, 在具体应用过程中, ETR会将接收到的 DNS请求报文 转发给所在的 LISP站点网络中的 DNS服务器, 该 DNS服务器在获取上述 DNS 请求报文后, 将 DNS请求报文中携带的 LISP标识信息或非 LISP标识信息复制 到 DNS回应报文中, ETR中的识别模块(404 )具体可以通过判断本网络中的 DNS服务器返回给发送端的 DNS回应报文中是否包含 LISP标记或非 LISP标 记, 来判断 DNS请求报文中是否包含 LISP标记或非 LISP标记。 相应的, 如果 DNS请求报文来自于非 LISP站点网络, ETR将 DNS回应报文中的 EID替换为传 送网络中可路由的地址后发送。
本发明实施例提供的 ETR还可以包括报文转发模块( 405 ) , 用于根据映 射建立模块( 402 )建立的目的主机的 EID与传送网络中可路由的地址的——对 地址的报文转发给所述目的主机。
本发明实施例还提供一种 LISP站点网络系统, 其结构如图 5所示, 具体实 现结构包括 DNS服务器 (51 )和出口隧道路由器 ETR ( 52 ) 。 其中, DNS服 务器( 51 )用于将接收的 DNS请求报文中的 LISP标识或非 LISP标识复制到 DNS 回应报文中, 并将所述 DNS回应报文发送给 ETR ( 52 ); ETR ( 52 )可以是上 述任意一个 ETR, ETR ( 52 )还根据上述 DNS回应报文中是否包含 LISP标识或 非 LISP标识判断所述 LISP站点网络接收的 DNS请求报文中是否包含 LISP标识 或非 LISP标识。
其中, DNS服务器 ( 51 )与 ETR ( 52 )之间的具体通信方式可参照上述方 法实施例的描述。
上述本发明实施例提供的系统中, LISP站点网络中的 ETR通过为非 LISP 站点网络侧访问的目的主机分配一个在传送网络中可路由的地址, 并建立该传
LISP站点网络访问 LISP站点网络。无需在网络中增加诸如 PTR之类的硬件, 因 此有效降低了实现难度, 并降低了实现成本。
以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并不局 限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易 想到的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明的保护 范围应该以权利要求的保护范围为准。

Claims

权 利 要 求 书
1、 一种非 LISP站点与 LISP站点通信的方法, 其特征在于, 包括: 位置与标识分萬协议 LISP站点网络中的出口隧道路由器 ETR为域名系统
DNS请求报文请求的目的主机分配一个传送网络中可路由的地址,所述 DNS请 求报文是由非 LISP站点网络侧发送的;
所述 ETR建立所述目的主机的端点标识符 EID与所述传送网络中可路由的 地址的——对应关系;
所述 ETR向所述非 LISP站点网络侧发送所述传送网络中可路由的地址。
2、 根据权利要求 1所述的方法, 其特征在于, 所述 ETR为所述目的主机分 配传送网络中可路由的地址之前,该方法还包括识别非 LISP站点网络侧发送的 DNS请求报文:
判断接收的 DNS请求报文中是否包含 LISP标识或非 LISP标识, 所述 LISP 标识用来标记所述 DNS请求报文来自于发送端 LISP站点网络, 所述非 LISP标 识用来标记所述 DNS请求报文来自于发送端非 LISP站点网络;
如果所述 DNS请求报文中包含非 LISP标识或者不包含 LISP标识, 则识别 出所述 DNS请求报文来自于非 LISP站点网络。
3、 根据权利要求 2所述的方法, 其特征在于, 所述向所述非 LISP站点网络 侧发送所述传送网络中可路由的地址包括:
将返回给所述非 LISP站点网络侧的 DNS回应报文中的所述目的主机的 EID替换为所述传送网络中可路由的地址并发送。
4、 根据权利要求 1 ~ 3任意一项所述的方法, 其特征在于, 该方法还包括: 所述 ETR接收所述非 LISP站点网络侧发送的通信报文,所述通信报文中的 目的地址为所述传送网络中可路由的地址; 根据所述目的主机的 EID与所述传 送网络中可路由的地址的——对应关系, 将所述报文转发给所述目的主机。
5、根据权利要求 2所述的方法, 其特征在于, 所述 LISP标记由发送端 LISP 站点网络中的 DNS解析器或设置了 DNS-应用层网关 ALG功能的入口隧道路由 器 ITR设置; 所述非 LISP标记由发送端非 LISP站点网络中的 DNS解析器或设置 了 DNS-应用层网关 ALG功能的边界路由器 BR设置。
6、 根据权利要求 3所述的方法, 其特征在于, 所述判断接收的 DNS请求报 文中是否包含 LISP标识或非 LISP标识包括:
获取所述 LISP站点网络中的 DNS服务器发送的 DNS回应报文, 判断所述 DNS回应报文中是否包含 LISP标识或非 LISP标识, 所述 DNS回应报文是 DNS 服务器根据所述 DNS请求报文发送的,并在所述 DNS请求报文中包含 LISP标识 或非 LISP标识时, 由 DNS服务器将 DNS请求报文中的 LISP标识或非 LISP标识 复制到所述 DNS回应报文中。
7、 一种 LISP站点网络中的出口隧道路由器 ETR, 其特征在于, 包括: 地址分配模块,用于为非 LISP站点网络侧发送的 DNS请求报文请求的目的 主机分配一个传送网络中可路由的地址;
映射建立模块, 用于建立所述目的主机的端点标识 EID与所述传送网络中 可路由的地址的——对应关系;
报文发送模块,用于向所述非 LISP站点网络侧发送所述传送网络中可路由 的地址。
8、 根据权利要求 7所述的 ETR, 其特征在于, 该 ETR还包括识别模块, 用 于判断所述 LISP站点网络的 DNS服务器返回的 DNS回应报文中是否包含 LISP 标识或非 LISP标识, 所述 LISP标识用来标记所述 DNS回应 文对应的所述 DNS请求报文来自于发送端 LISP站点网络, 所述非 LISP标识用来标记所述 DNS回应报文对应的所述 DNS请求报文来自于发送端非 LISP站点网络;如果所 述 DNS回应报文中包含非 LISP标识或者不包含 LISP标识, 则识别出对应的所 述 DNS请求报文来自于非 LISP站点网络, 所述 DNS回应报文中的 LISP标识或 非 LISP标识为 DNS服务器从对应的 DNS请求报文中复制得到的。
9、 根据权利要求 7、 8所述的 ETR, 其特征在于, 该 ETR还包括报文转发 模块, 用于根据所述映射建立模块建立的所述目的主机的 EID与所述传送网络 中可路由的地址的——对应关系,将所述非 LISP站点网络侧发送的目的地址为
10、 一种 LISP站点网络系统, 其特征在于, 包括 DNS服务器和出口隧道路 由器 ETR:
所述 DNS服务器用于将接收的 DNS请求报文中的 LISP标识或非 LISP标识 复制到 DNS回应报文中, 并将所述 DNS回应报文发送给所述 ETR;
所述 ETR为上述权利要求 7 ~ 9任意一项所述的 ETR,并根据所述 DNS回应 报文中是否包含 LISP标识或非 LISP标识判断所述 LISP站点网络接收的 DNS请 求报文中是否包含 LISP标识或非 LISP标识。
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