To set static routes, use the /etc/sysconfig/network-scripts/route- files which are read during the network service initialization. For example to add static route for eth0, create a file /etc/sysconfig/network-scripts/route-eth0 and add the routes as explained below

For ip commands, the ifup-route script. supplies ip route add and the contents of the file are all parameters necessary to set up the route. For example, to set up a default route, the file would contain the following:

default via X.X.X.X dev eth0
10.10.10.0/24 via X.X.X.X dev eth0

The alternative format is as follows:
~~~
ADDRESS0=10.10.10.0
NETMASK0=255.255.255.0
GATEWAY0=X.X.X.X
In the above example, X.X.X.X is the gateway IP address. Subsequent entries must be numbered sequentially (for example ADDRESS1=, NETMASK1=, GATEWAY1=). Note, that multiple entries must be sequentially numbered and must not skip a value (0 must be followed by 1, not a number greater than 1).

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