Forcing IGMP version in Linux

In this article, we will see how to force the IGMP version in linux environement.

Use the following command to check the current version of IGMP

root@root: cat /proc/sys/net/ipv4/conf/eth0/force_igmp_version
 0

In the above, we can see the current IGMP version is 0 which is the default one.

For eth0, it is recommended to use IGMP version 2. So, we need to change the IGMP version from 0 to 2.

To do that, use the following command.

root@root: echo "2" > /proc/sys/net/ipv4/conf/eth0/force_igmp_version

Note: If needed, change eth0 to ethX in the above command.

Use the command below to verify the version.

root@root: cat /proc/sys/net/ipv4/conf/eth0/force_igmp_version
 2

In order to check whether it is working or not, issue the command below while there is enough traffic.

root@rootroot@root: tcpdump -i eth0 igmp