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Windows Server® 2008 TCP/IP Protocols and Services by Joseph Davies

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IGMP Message Structure

Hosts and routers use IGMP to maintain local subnet host group membership and it is required for hosts that support Level 2 IP multicasting. IGMP messages are sent as IP datagrams with the IP Protocol field set to 2. The resulting IP datagram is then encapsulated with the appropriate Network Interface Layer header and trailer. Figure 7-2 shows the resulting frame.

IGMP message structure showing the IP header and Network Interface Layer header and trailer

Figure 7-2. IGMP message structure showing the IP header and Network Interface Layer header and trailer

In the IP header of IGMP messages, the Source IP Address field is set to the router or host interface that sent the IGMP message and the Destination IP Address field ...

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