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IGMP version 2의 Message type은 4개로 이루어져 있다.
Message Type Destination Group
------------ -----------------
General Query ALL-SYSTEMS (224.0.0.1)
Group-Specific Query The group being queried
Membership Report The group being reported
Leave Message ALL-ROUTERS (224.0.0.2)
일반적인 Query를 보낼때 Destination에 224.0.0.1로 Leave Message를 보낼때 224.0.0.2로 정의되어 있다.
- Membership Query Packet file
-- Type에 Membership query로 표기, IP Protocol에는 224.0.0.1, Mulitcast Address는 0.0.0.0
Membership Report Group(Multicast Group 에 report를 보낼때)
- Membership Report Packet File
-- Membership Report는 specific Multicast address를 선택하여 보냄.
https://datatracker.ietf.org/doc/html/rfc2236
RFC 2236: Internet Group Management Protocol, Version 2
This memo documents IGMPv2, used by IP hosts to report their multicast group memberships to routers. It updates STD 5, RFC 1112. [STANDARDS-TRACK]
datatracker.ietf.org
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