Simple network routes can be set under Linux using the route
command become. Here is a simple example:
route add -net 192.168.20.0 netmask 255.255.255.0 gw 192.168.0.1
In order for this change to be active even after a restart, the file /etc/network/interfaces
must be changed.
iface ens192 inet static
address 192.168.0.156/24
up /bin/ip route add 10.25.20.0/24 via 192.168.0.1