Method and system for realizing multicast in Internet protocol version 4 over Internet protocol version 6 (IPv4overIPv6) tunnel

A multicast and tunnel technology, applied in the field of IPv6 network, can solve the problems of reduced transmission efficiency, waste of IPv6 bearer network bandwidth, inability to identify and encapsulate IPv4 multicast group addresses, etc., to save bandwidth, ensure smooth transition, and achieve efficient utilization. Effect

Active Publication Date: 2012-07-04
CHINA TELECOM CORP LTD
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Problems solved by technology

However, for the original IPv4 multicast data packets, since only the unicast addresses at both ends of the IPv6 tunnel can be seen in the tunnel, the IPv4 multicast group address inside the encapsulation cannot be identified, and the multica

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  • Method and system for realizing multicast in Internet protocol version 4 over Internet protocol version 6 (IPv4overIPv6) tunnel
  • Method and system for realizing multicast in Internet protocol version 4 over Internet protocol version 6 (IPv4overIPv6) tunnel
  • Method and system for realizing multicast in Internet protocol version 4 over Internet protocol version 6 (IPv4overIPv6) tunnel

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[0016] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention.

[0017] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0018] figure 1 It is a schematic flowchart of an embodiment of the method for implementing multicast in the present invention.

[0019] Such as figure 1 As shown, this embodiment may include the following steps:

[0020] S102, the user-side gateway encapsulates the IGMP multicast group joining request message into an IPv6 tunnel for transmission, and maps the IPv4 multicast group address carried in the IGMP multicast group joining reque...

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Abstract

The invention provides a method and a system for realizing multicast in an Internet protocol version 4 over Internet protocol version 6 (IPv4overIPv6) tunnel. The method comprises the following steps that: a user side gateway encapsulates an Internet group management protocol (IGMP) multicast group addition request into an IPv6 tunnel for transmission, maps an IPv4 multicast group address into an IPv6 multicast group address, generates a multicast listener discovery (MLD) request message and transmits the MLD request message to a network side; the network side updates an IPv4 multicast tree forwarding table and an IPv6 multicast tree forwarding table; after receiving an IPv4 multicast data packet, the network side maps the IPv4 multicast group address into the IPv6 multicast group address, and downstream forwards an IPv6 multicast data packet obtained by the address mapping; a multicast replication point transmits the multicast-replicated IPv6 multicast data packet to a user side; and after receiving the IPv6 multicast data packet, the user side gateway decapsulates the IPv6 multicast data packet according to a multicast address mapping relationship, recovers the IPv4 multicast data packet and transmits the IPv4 multicast data packet to a user terminal.

Description

technical field [0001] The invention relates to the field of IPv6 network technology, in particular, to a method and system for realizing multicast in an IPv4overIPv6 tunnel. Background technique [0002] Currently, IPv4 addresses are becoming more and more scarce. According to the last three-year address usage data forecast by the Internet Assigned Number Authority (IANA), global IPv4 address resources will be exhausted around the end of 2011. Under such circumstances, it has become an inevitable trend of Internet development that IPv6 addresses gradually replace IPv4 addresses. However, the incompatibility between the IPv6 protocol and the IPv4 protocol also makes it impossible for IPv4 applications to migrate to the IPv6 network overnight. Because of this, it also leads to a variety of transition technologies in the IPv6 evolution stage. In addition to the relatively mature dual-stack In addition to technology, there are also tunneling technology and translation technolo...

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Application Information

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IPC IPC(8): H04L12/56H04L29/12H04L45/16
Inventor 王茜陈运清杨锋孙琼胡捷刘建国谭卫平
Owner CHINA TELECOM CORP LTD
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