Linux Routing Configuration

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External

Internal

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

ip

The equivalent "route" command is:

route add 224.0.0.0 netmask 240.0.0.0 dev <device-name>

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.

After reboot, we'll get this:

[eap@app01 ~]$ ip route
...
224.0.0.0/4 via 172.20.1.12 dev eth1