May 2006
Intermediate to advanced
480 pages
12h 20m
English
Content preview from Understanding TCP/IP
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5.6 Internet Group Management Protocol
Like ICMP, IGMP is a service protocol for IP. IGMP packets are wrapped into IP datagrams. It is used for forwarding multicasts. Currently, version 2 of the IGMP protocol is up to date with RFC 2236 norms.
The following figure shows the structure of an IGMP version 2 packet:
Figure 5.30: IGMP v2 packet
The Type field acquires the values shown in the following table:
|
Value (hexadecimal) |
Significance |
|---|---|
|
11 |
IP Membership query ("Are there any members on the LAN?") |
|
12 |
IGMPv1 Membership Report |
|
16 |
IGMPv2 Membership Report |
|
17 |
IGMPv2 Leave Group |
The MRT (Maximum Response Time) field is only used in router requests ...
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