Route commands

Display Existing Routes (numerical IP address)
$ route -n
Kernel IP routing table
Destination    Gateway    Genmask    Flags    Metric    Ref    Use    Iface
0.0.0.0          192.168.1.1      0.0.0.0    UG      100    0       0    eth0

Make your machine eht0 network interface access all other networks via the gateway 192.168.11.1
# route add default gw 192.168.11.1 eth0

Make your machine eht0 network interface access all 172.19.218.0 networks via the gateway 192.168.11.1

#### ifconfig eth0:0 172.19.218.1/24 up

# route add -net 172.19.218.0 netmask 255.255.255.0 gw 192.168.11.1

Display Existing Routes
# route -print
Active Routes:
Network Destination    Netmask    Gateway    Interface   Metric
0.0.0.0     0.0.0.0        192.168.1.1     192.168.10.1     276

Make your machine (192.168.10.1) access network 11.11.11.0 via the gateway 192.168.11.1
# route add 11.11.11.0 mask 255.255.255.0 192.168.11.1 -p