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Re: [LIP] tcp checksum calculation

On Thu, 14 Feb 2002, Amit Shah wrote:

> Hi,
>    I have a function(in the kernel, ip_rcv_finish... before the ip
> forwarding code.) that takes in packets, replaces the dest. ip:port, and
> sends to that machine. (ip forwarding is enabled.) I need to recalculate
> the checksum..... ip checksumming works fine(ip_fast_csum)... but, the tcp
> checksum is shown as incorrect on ethereal. The packets are not delivered
> to the new dest.... 

Put in you code snippet for us to have a look at.
Have you tried looking at the packet thru other protocol analyzers just to 
be sure?

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                  Amit Kucheria
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         University of Kansas @ Lawrence
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