创建虚拟网卡(loopback)

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)