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--- check_igmp_version_on_an_interface [2020/05/15 15:23] – created walkeradmin
+++ check_igmp_version_on_an_interface [2023/03/09 22:35] (current) – external edit 127.0.0.1
@@ Line 5: / Line 5: @@
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-Multicast routes are a similar concept to IP Routes, but as the name implies they are for Multicast addresses (which are class D), rather than standard IP Addresses (which are class A, B and C). For Unicast I would surmise you still use IP Routes.
+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:
+\\
+\\
+    cat /proc/net/igmp
+\\
+\\
+Below is a sample output:
+<file>
+Idx     Device    : Count Querier       Group    Users Timer    Reporter
+       lo        :     1      V3
+E0     1 0:00000000               0
+       eth0      :     4      V2
+FBDBED     1 0:00000000               1
+                                FE7F02EB     3 0:00000000               1
+E0     1 0:00000000               1
+E0     1 0:00000000               0
+       eth1      :     3      V3
+EF     1 0:00000000               0
+EF     1 0:00000000               0
+E0     1 0:00000000               0
+       eth2      :     2      V3
+                                FE7F02EB     1 0:00000000               0
+E0     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>.
+\\
+\\