Adding a route after switching on the interface - Post-Up
Quite often one or more explicit routes are needed on a network interface. Here are the quick instructions to put this in the /etc/network/interfaces file.
Here is shown how a route can be added after a network interface has been successfully initialized. However, it is just as important to set the same command to remove the route when shutting down the interface.
Post-up means in this context that the command is only issued when the interface is marked as UP.
You could also set this command with just UP instead of POST-UP.
In this example, a route is set to the destination network 192.168.20.0/24, which is reachable via the gateway 192.168.10.250.
## Edit the file
nano /etc/network/interfaces
## Change the network config to your choise network configuration
auto eth0
allow-hotplug eth0
iface eth0 inet static
address 192.168.10.10
netmask 255.255.255.0
gateway 192.168.10.1
POST-UP ip route add 192.168.20.0/24 via 192.168.10.250
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