ecco cosa mi dice
marco@marco:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:12:0E:43:55:F2
inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::212:eff:fe43:55f2/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:41666 errors:0 dropped:0 overruns:0 frame:0
TX packets:26624 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:61910015 (59.0 MiB) TX bytes:1902726 (1.8 MiB)
Interrupt:11 Base address:0x2000

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:7 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:372 (372.0 b) TX bytes:372 (372.0 b)
il mio ip è 192.168.1.2
perchè non è uguale ?