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I have an embedded target device with cross-compilation development settings (ELDK). I happened to use ifconfig to see the ethernet interfaces on the embedded OS. Besides, the eth/lo interfaces, I see one 

teql0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          NOARP  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 
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

by some investigation, I know this is used for some flow equalizer from TC module. However, why I did not see this result when I use ifconfig on other linux, e.g. on my host machine?

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