IP: multicast policy routing


Linux Kernel Configuration
└─>Networking support
└─>Networking options
└─>IP: multicast policy routing
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
Normally, a multicast router runs a userspace daemon and decides
what to do with a multicast packet based on the source and
destination addresses. If you say Y here, the multicast router
will also be able to take interfaces and packet marks into
account and run multiple instances of userspace daemons
simultaneously, each one handling a single table.

If unsure, say N.