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x520 capturing problem

I have an Ubuntu server running 2.6.25 kernel compiled with pfring, revision 3603. The network card is an Intel X520 fiber card. Ifconfig shows the interface as 'running' and the rx packet count is increasing.
If I start tcpdump on that interface, dmesg and /proc/net/pf_ring/info report a ring being added. Still tcpdump cannot capture the traffic. Any idea why?


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