What is IGMP (Internet Group Management Protocol)?

Version (1)

Type (1-2)

Unused

16-Bit Checksum

32-Bit Group Address

IGMPv1 Packet Structure

Type

Max Response Code

Checksum

32-Bit Group Address

IGMPv2 Packet Structure

Bit Offset

0-3

4

5-7

8-15

16-31

0

Type=0x11

Max Response Code

Checksum

64

Resv

S

QRV

QQIC

Number of Sources (N)

32	Group Address

128	Sources Address [2]

96	Sources Address [1]

Sources Address [N]

IGMPv3 Packet Structure

References:

1) https://en.wikipedia.org/wiki/Internet_Group_Management_Protocol

2) https://www.sysnettechsolutions.com/en/what-is-igmp/

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