Subject: (NAT) doubt in checksum calculation algo of NAT.

From: Ramasamy <[email-masked]>
Date: Thu, 16 Dec 1999 10:53:00 +0530

Hi
	I have a doubt in checksum caluclation module of NAT.
Actually, the  checksum calculation algo. given in draft-ietf-nat-traditional-01.txt will work only if the optr( pointer to the old data ) is at an even offset from the start of the header.
suppose if optr starts from the odd offset, can we change optr to optr-1, so that it will point to the byte which is immediately before the actual start of the old data and now the optr points to an even offset from the start of the header. after this modification ,can we apply the same algo. will there be any problem?

or do we have to compute the checksum byte by byte in the usual way, if the  conditions given in the draft are not satisfied?.

please clarify my doubts.

bye
rams.
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