Linux Routing Configuration
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External
Internal
Listing Routes
Adding Multicast Routing to a Specific Network Interface
ip route add 224.0.0.0/4 dev <device-name>
More details about ip can be found here
The equivalent "route" command is:
route add 224.0.0.0 netmask 240.0.0.0 dev <device-name>
More information:
Routing Configuration that Survives Reboot
Add the static routing configuration to /etc/sysconfig/network-scripts/route-<device-name>:
... # default multicast route 224.0.0.0/4 via 172.20.1.12
where "172.20.1.12" is the IP address of the interface we want to route the multicast traffic over. It is sufficient to add static routing configuration only to the file route-* corresponding to the interface that will service the route.
After reboot, we'll get this:
[eap@app01 ~]$ ip route ... 224.0.0.0/4 via 172.20.1.12 dev eth1