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From: "nctucis" <gis88530@cis.nctu.edu.tw>
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Subject: skbuff.h
Date: Mon, 9 Apr 2001 21:48:12 +0800
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Hi,

I use 2.2.16 kernel.
I found that there is a sk_buff structure in
"/usr/src/linux/include/linux/skbuff.c", and
there is a variable "unsigned in csum;" in 
the sk_buff structure.

I want to know this checksum check what information.
Could you give me a hand, please?

-=-=-=-=-=-=-=-
In fact, I found 64byte and 1518byte UDP packet waste different
time to do masquerade(ip_fw_masquerade). 
Many books say NAT just modify header fields, so it should no 
different between small and big packet size.
I guess the different time due to csum_partial(h.raw, doff, sum)
in ip_fw_masquerade(). Right? Thanks a lot.
(But I can't find out source code of this function.)

Cheers,
Tom


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