EtherCAT can't be captured though Ethernet works

[N Nguyen <catsmemory2009 () yahoo com>]

Hello,

I am using EtherCAT, and I'd like to use wireshark to capture the frames.
If I stop the EtherCAT, the eth0 is listed in the capture list, and everything is OK.
But if I start EtherCAT, the ifconfig tells that there's only local loopback lo 127.0.0.1. And apparently wireshark 
cannot capture the EtherCAT, although I am transferring frames via my NIC card (RTL 8139).

Does anyone have any comment?

Thank you very much in advance!!!

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