How to enable multicast to IP address?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux All

Issue

  • How to enable multicast to IP address?

Resolution

  • In order to check whether multicast is enabled to a IP address :
$ ifconfig ethX |grep -i multi

Note : Please replace ethX with appropriate Ethernet. If multicast is enabled, a flag will be displaying.

To disable it :

$ ifconfig ethX -multicast

To enable it :

$ ifconfig ethX multicast

In order to look at the IP address which has subscribed the multicast group, one can take a look at in the content of following file :

/proc/net/igmp

Example :

cat /proc/net/igmp 
Idx Device    : Count Querier   Group    Users Timer    Reporter
1   lo        :     0      V3
                010000E0     1 0:00000000       0
2   eth1      :     3      V2
                010000E0     1 0:00000000       0
3   eth0      :     3      V2
                010000E0     1 0:00000000       0
  • Based on multicast application, IP will be receiving or transferring packets.

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