The command ifconfig -a shows all interfaces with their parameters. The output should be:
eth0 Link encap:Ethernet HWaddr ??:??:??:??:??:?? UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1 RX packets:10588 errors:0 dropped:0 overruns:0 frame:0 TX packets:12632 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:1820173 (1.7 MiB) TX bytes:2125389 (2.0 MiB) Interrupt:5 eth1 Link encap:Ethernet HWaddr ??:??:??:??:??:?? UP BROADCAST RUNNING ALLMULTI MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:12 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:4 Base address:0x1000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:12 errors:0 dropped:0 overruns:0 frame:0 TX packets:12 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:852 (852.0 B) TX bytes:852 (852.0 B) vlan0 Link encap:Ethernet HWaddr ??:??:??:??:??:?? inet addr:10.0.0.10 Bcast:10.0.0.255 Mask:255.255.255.0 UP BROADCAST RUNNING ALLMULTI MULTICAST MTU:1500 Metric:1 RX packets:10590 errors:0 dropped:0 overruns:0 frame:0 TX packets:12608 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1629781 (1.5 MiB) TX bytes:2037798 (1.9 MiB) vlan1 Link encap:Ethernet HWaddr ??:??:??:??:??:?? inet addr:192.168.10.10 Bcast:192.168.10.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:21 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:12474 (12.1 KiB) vlan2 Link encap:Ethernet HWaddr ??:??:??:??:??:?? inet addr:192.168.20.1 Bcast:192.168.20.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) vlan3 Link encap:Ethernet HWaddr ??:??:??:??:??:?? inet addr:192.168.30.1 Bcast:192.168.30.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) vlan4 Link encap:Ethernet HWaddr ??:??:??:??:??:?? inet addr:192.168.40.1 Bcast:192.168.40.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)