capturing packets with CRC errors

[Michael Ang <mang () subcarrier org>]

Are packets with CRC errors captured by default on FreeBSD?  Is this 
hardware dependent?

I found a question about this in the Ethereal FAQ that seems to hint 
packet with bad CRCs aren't captured[1].  But I guess this only applies 
to CRC errors at the link level?

My program deals with TCP packets and I want to know if packets with CRC 
errors at the IP and TCP level are rejected.  Verifying the IP header 
CRC seems feasible, but not TCP since it may be too expensive and I want 
to set a small snaplen.

Thanks,
        - Mike.

[1] http://ethereal.ntop.org/faq.html#q4.17

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