====== Check IGMP Version on an Interface ======
<color #db5f0b>May 2020</color>
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This is from CentOS 7.7. It may work with other Linux distros, but I cannot guarantee that.
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One way to check the IGMP version being used by an interface is to use the following command:
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    cat /proc/net/igmp
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Below is a sample output:
<file>
Idx     Device    : Count Querier       Group    Users Timer    Reporter
1       lo        :     1      V3
                                010000E0     1 0:00000000               0
2       eth0      :     4      V2
                                61FBDBED     1 0:00000000               1
                                FE7F02EB     3 0:00000000               1
                                120000E0     1 0:00000000               1
                                010000E0     1 0:00000000               0
3       eth1      :     3      V3
                                026400EF     1 0:00000000               0
                                016400EF     1 0:00000000               0
                                010000E0     1 0:00000000               0
4       eth2      :     2      V3
                                FE7F02EB     1 0:00000000               0
                                010000E0     1 0:00000000               0

</file>
Here we can see that <color #ed1c24>eth0</color> is using <color #ed1c24>IGMP V2</color>, while <color #00a2e8>eth1</color> and <color #00a2e8>eth2</color> are using <color #00a2e8>IGMP V3</color>.
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