多网卡单网线判断网线是插在哪个网卡上的办法
插了网线的网卡的状态：eth0 Link encap:Ethernet HWaddr 00:40:D0:4B:44:BE
inet addr:192.168.3.20 Bcast:192.168.255.255 Mask:255.255.0.0
inet6 addr: fe80::240:d0ff:fe4b:44be/64 Scope:Link
UP BROADCAST
RUNNING MULTICAST MTU:1500 Metric:1
RX packets:155 errors:0 dropped:0 overruns:0 frame:0
TX packets:124 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:17260 (16.8 KiB) TX bytes:17615 (17.2 KiB)
Interrupt:11 Base address:0x8800
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:560 (560.0 b) TX bytes:560 (560.0 b)
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没有插网线网卡的状态：eth0 Link encap:Ethernet HWaddr 00:40:D0:4B:44:BE
inet addr:192.168.3.20 Bcast:192.168.255.255 Mask:255.255.0.0
inet6 addr: fe80::240:d0ff:fe4b:44be/64 Scope:Link
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:129 errors:0 dropped:0 overruns:0 frame:0
TX packets:105 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:11624 (11.3 KiB) TX bytes:16368 (15.9 KiB)
Interrupt:11 Base address:0x8800
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:560 (560.0 b) TX bytes:560 (560.0 b)
细心的朋友应该看出来插了网线和没有插网线的区别了，区别之处我已经用红字标明了。
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