From: Rick Jones <rick.jones2@hp.com>
Date: Mon, 11 Aug 2008 18:30:11 -0700

quoted text
> Even if it was verified I think you want to keep the checksums from the 
> header.   Since an intermediate device isn't supposed to be peeking at 
> the TCP part anyway, it wouldn't do to drop the segment ourselves, pass 
> it along to be dropped by the ultimate reciever.  And if there is 
> something amis in the verification or the regeneration, we don't want to 
>   introduce silent data corruption.
> 
> Likely that also goes for the IP header checksum...

IP header is a little different, intermediate nodes should verify it
(and we do adjust it when  decrementing TTL).
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