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Invention Grant
US08054766B2 Method and tool for IP multicast network address translation (MNAT) 有权
IP组播网络地址转换（MNAT）的方法和工具

Method and tool for IP multicast network address translation (MNAT)
Abstract:
The present invention permits translation of SM addresses (*, G1) and (*, G2) to configurable SSM addresses (S0, G0). IGMPv2 group membership queries from the receiver subnet are translated to IGMPv3 membership queries for processing in a SSM network. In the preferred embodiment, packets travel via a connection to the multicast router (mrouter). The mrouter queries an IGMPv2 receiver. The IGMPv2 receiver generates a membership report and sends it back to the mrouter. The mrouter translates the membership report into a (S0, G0) as specified in a multicast address translation table and stores the translation in the Multicast Forward Information Base (MFIB) located in the mrouter. Multicast payload addressed (S0, G0) flowing towards the IGMPv2 receiver can be translated to (S0, G0). When media data is addressed to (S0, G0), the mrouter consults the MFIB for forwarding and can also translate the destination address to (S1, G1).
Abstract(Chinese):

本发明允许将SM地址（*，G1）和（*，G2）转换成可配置的SSM地址（S0，G0）。 来自接收器子网的IGMPv2组成员资格查询将转换为IGMPv3成员资格查询，以便在SSM网络中进行处理。 在优选实施例中，分组经由连接传播到多播路由器（mrouter）。 mrouter查询IGMPv2接收器。 IGMPv2接收器生成成员资格报告并将其发送回mrouter。 主播将会员报告转换为多播地址转换表中指定的（S0，G0），并将转换存储在位于mrouter中的组播转发信息库（MFIB）中。 流向IGMPv2接收机的多播有效载荷寻址（S0，G0）可以转换为（S0，G0）。 当媒体数据寻址到（S0，G0）时，mrouter查询MFIB进行转发，还可以将目标地址转换为（S1，G1）。

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