02-07-2001
The loopback interface is different than a hardware interface. Loopback is internal to the kernel and never sees an external device. For example, an ifconfig output:
Quote:
eth0 Link encap:Ethernet HWaddr 00:A0:24:80:52:9F
inet addr:165.209.1.200 Bcast:165.209.1.255 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:100
Interrupt:11 Base address:0xd800
eth1 Link encap:Ethernet HWaddr 00:00:C0:31:B3:95
inet addr:84.14.111.22 Bcast:84.14.111.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1463590 errors:0 dropped:0 overruns:0 frame:0
TX packets:1401027 errors:0 dropped:0 overruns:0 carrier:0
collisions:170 txqueuelen:100
Interrupt:10 Base address:0x310 Memory:cc000-d0000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:3924 Metric:1
RX packets:4492 errors:0 dropped:0 overruns:0 frame:0
TX packets:4492 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
Note that the loopback interface is not the same as the ethernet interfaces.
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