IP DATAGRAM WITH IGMP HEADER
| VERSION |
IHL |
ToS |
Total Length |
| Identification |
|
| TTL |
Protocol |
Header Checksum |
| Source Address |
| Destination Address |
| Options |
Padding |
TYPE
<- 8 bits -> |
MaxResp
Time
<-8 bits-> |
CHECKSUM
<- 16 bits -> |
GROUP
ADDRESS
<- 32 bits -> |
| < IGMP Payload or future expansion > |
|
FIELD DESCRIPTIONS
- Type
- Type of IGMP message. There are three types: Membership Query, Membership
Report and Leave Group.
- Maximum Response Time
- This field is used only in Membership Query messages. This field is the
maximum time a host is allowed to produce and send a Membership Report message
after receiving a Membership Query message.
- Checksum
- This is the one's compliment of the one's complement sum of the entire
IGMP message, which basically works out to be the entire payload of the
IP datagram the IGMP datagram is encapsulated within.
- Group Address
- Behavior of this field varies by the type of message sent:
Membership Query: (set to)
General Query: All zeroes
Group Specific Query: multicast group address
Membership Report: multicast group address
Leave Group: multicast group address
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