Krzysztof Oledzki <[EMAIL PROTECTED]> wrote:
> 
> It seems that after some not very recent changes udp and tcp packes 
> carring data send by a loopback have incorrect cksum:

This correct.  The loopback interfaces has the no checksum flag
set so we only provide a partial checksum on output (i.e., the
pseudoheader without the payload).

We even export this to user-space via a flag.  So you should fix
tcpdump to read this flag and ignore the checksum.

Cheers,
-- 
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