IPv6: multicast routing

configname: CONFIG_IPV6_MROUTE

Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>The IPv6 protocol
└─>IPv6: multicast routing
In linux kernel since version 2.6.26 (release Date: 2008-07-13)  
Support for IPv6 multicast forwarding.
If unsure, say N.