Aide-memoire: On OpenDarwin 7.2.1RC5 x86 [5] ifconfig -a

En_route

lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST>; mtu 16384
        inet6 ::1 prefixlen 128
        inet6 fe80::1 prefixlen 64 scopeid 0x1
        inet 127.0.0.1 netmask 0xff000000
gif0: flags=8010<OINTOPOINT,MULTICAST>; mtu 1280
stf0: flags=0<>; mtu 1280
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST>; mtu 1500
        ether 00:10:4b:2f:8a:d1
        media: autoselect (<unknown type> status: inactive
        supported media: 10baseT/UTP <half-duplex>; 10base5/AUI <half-duplex>; autoselect 10base2/BNC <half-duplex>;
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST>; mtu 1500
        inet 192.168.10.11 netmask 0xffffff00 broadcast 192.168.10.255
        ether 00:60:08:99:09:77
        media: autoselect (100baseTX <full-duplex> status: active
        supported media: 10baseT/UTP <half-duplex>; 10baseT/UTP <full-duplex>; autoselect 100baseTX <half-duplex>; 100baseTX <full-duplex>;