To add a static route in CentOS 5.2 create a file specific to the interface in /etc/sysconfig/network-scripts.
For example, if you are adding routes where the route’s gateway will be on the network in use on eth0, you will create the following file: route-eth0
In the file add the following parameters:
GATEWAY0=192.168.195.2
NETMASK0=255.255.255.0
ADDRESS0=10.0.0.0
For each subsequent route statement increment the number that is appended to each parameter.

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