Net
_$: route add -net 192.168.1.0 netmask 255.255.255.0 dev eth0
_$: route -n
Destination Gateway Genmask Flags Metric Ref Use Iface
...
192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
_$: route del -net 192.168.1.0 netmask 255.255.255.0 dev eth0
Host
_$: route add -host 192.168.1.105 dev eth0
_$: route -n
Destination Gateway Genmask Flags Metric Ref Use Iface
...
192.168.1.105 0.0.0.0 255.255.255.255 UH 0 0 0 eth0
_$: route del -host 192.168.1.105 dev eth0
Gateway
_$: route add default gw 192.168.1.1 dev eth0
_$: route -n
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 192.168.1.1 0.0.0.0 UG 0 0 0 eth0
_$: route del default gateway 192.168.1.1