On Friday 21 November 2003 9:00 pm, Hildebrand, Brian wrote:
> www.netfor2.com/tcpsum.htm
>
> That is the first website I found. I'm sure if you look some more you could
> probably find about 500 more. If you do not follow those instructions, you
> will get bad checksum returns. Just because it is an OSI layer higher does
> not mean it can't include data from lower down the chain.
You are right. The TCP checksum contains a "notional IP header" which is
included in the calculation.
Today is not a good day for me :( It must be somebody else's birthday.
Antony.
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