$ ifconfig eth0
 eth0      Link encap:Ethernet  HWaddr 00:0F:20:CF:8B:42
           inet addr:217.149.127.10  Bcast:217.149.127.63  Mask:255.255.255.192
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:2472694671 errors:1 dropped:0 overruns:0 frame:0
           TX packets:44641779 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:1761467179 (1679.7 Mb)  TX bytes:2870928587 (2737.9 Mb)
           Interrupt:28

$ ifconfig eth0 10.0.0.1 255.255.0.0 # Setting a new ip for eth0
$ ifconfig
 eth0      Link encap:Ethernet  HWaddr 00:0F:20:CF:8B:42
           inet addr:10.0.0.1  Bcast:10.0.255.255  Mask:255.255.0.0
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:2472694671 errors:1 dropped:0 overruns:0 frame:0
           TX packets:44641779 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:1761467179 (1679.7 Mb)  TX bytes:2870928587 (2737.9 Mb)
           Interrupt:28