add route in linux

1.add new route
#route add -net 172.16.0.0. netmask 255.255.0.0 gw 172.16.1.1

2.del route
#route del -net 172.16.0.0 netmask 255.255.0.0 gw 172.16.1.1

3.modify default route
#route add -net 0.0.0.0 netmask 0.0.0.0 gw 10.10.10.1