IGMP messages
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... hosts conforming to level 2 of the IP multicasting
specification. IGMP messages are encapsulated in IP datagrams, with
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... IP datagrams, with
an IP protocol number of 2. All IGMP messages of concern to hosts
have the following format:
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...
All other events, such as receiving invalid IGMP messages, or IGMP
messages other than Query or Report, are ignored in all states.
...
... All other events, such as receiving invalid IGMP messages, or IGMP
messages other than Query or Report, are ignored in all states.
...