We've already discussed viewing our routing tables with the route command, if you wanted to add or remove routes you can do so manually.
Add a new route
$ sudo route add -net 192.168.2.1/23 gw 10.11.12.3
Delete a route
$ sudo route del -net 192.168.2.1/23
You can also perform these changes with the ip command:
To add a route
$ ip route add 192.168.2.1/23 via 10.11.12.3
To delete a route
$ ip route delete 192.168.2.1/23 via 10.11.12.3
$ ip route delete 192.168.2.1/23
There are no exercises for this lesson but you can read more information on commands discussed here in the man pages
$ man route
$ man ip-route
What is the command flag to delete a route?