在/etc/network/interface中
iface lo-bg inet loopback
bridge_ports lo
bridge_stp on
bridge_maxwait 0
可以创建一个拥有硬件网址loopback卡
lo-bg Link encap:Ethernet HWaddr be:e2:2d:06:c3:cb
inet addr:127.0.0.1 Bcast:127.255.255.255 Mask:255.0.0.0
UP BROADCAST 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)