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
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 routing configuration to /etc/sysconfig/network-scripts/route-<device-name>:
# default route default via 192.168.1.1 dev <device-name> # default multicast route 224.0.0.0/4 via dev <device-name>