reading and recording (caputure) header of any packet

hi
can any one help me with this field
iam try to capture any packet ( i mean ip field) (the used field and unused field) of packet header can i find any program to do that or any document to help me

thanks
nasemabdullaaAsked:
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CCIE8122Connect With a Mentor Commented:
Ethereal will do what you want.  It will display the entire layer-three header in hex, which you can convert to binary and with the TCP/IP RFC as reference, you can identify the value of every field in the header.

www.ethereal.com

HTH

kr
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CCIE8122Commented:
oh, and it is free
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ubigConnect With a Mentor Commented:
Ethereal is a great freeware for that. It's development have ceased though so I would recommend to download WireShark which is successor of the product. You can find it here: http://www.wireshark.org/download.html.
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