[Q] The way to detect error from captured packet

 I made a  packet analyze program(very simple. Using packet capture library).
This program show packet size and  IP. I want to add another feature. Like a error detecting.(CRC, Fragments, Alignments and so on. Sniffer show this error. I need only CRC)
 How can I detect error from captured packet.

goodsoulAsked:
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grg99Commented:
If you want to detect errors down at the MAC level you may have to hook things at a lower level.  Most MAC layers filter out all the "bad" packets.  See the docs about the packet capture library. They may either have an option to turn ON passing up of bad packets, or they may keep statistics on total number of such packets.   Or you may have to call the low-level driver yourself to set "pass up bad packets", or to set a callback that will receive bad packets.

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