route essential reference

Adding a route:

route add -net [net or host] gw [gw IP] netmask [mask] dev [interface]

Removing a route:

route del -net [net or host] gw [gw IP] netmask [mask] dev [interface]

Adding/removing a default route:

route add/del default gw [IP]

Listing routes using IPs:

route -n

Rejecting a specific host:

route add -host [IP] reject