Intel X520-SR2 not seeing packets in tcpdump

[Charles DeVoe <scarecrow_57 () yahoo com>]

I have installed an X520 card with the latest driver ixgbe 3.8.  The operating systems is CentOS 5.7.  When doing an 
ifconfig I see receive packets.  I also see packets when I do an ethtool -S p1p2.  However, when I do tcpdump -i p1p2 I 
see no packets.  Does anyone know why this may be happening.
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