RE: about the ULID in the TCP checksum

["Henderson, Thomas R" <thomas.r.henderson@boeing.com>]

> -----Original Message-----
> From: Iljitsch van Beijnum [mailto:iljitsch@muada.com] 
> Sent: Monday, January 08, 2007 10:25 AM
> To: Henderson, Thomas R
> Cc: shim6-wg
> Subject: Re: about the ULID in the TCP checksum
> 
> On 8-jan-2007, at 17:00, Henderson, Thomas R wrote:
> 
> > What do you mean, "detect incorrect shimming using the 
> checksum"?  Do
> > you mean context confusion?  I'm not sure it's any worse off.
> 
> For instance, when some bit error occurs (or, more realistically, a  
> few) so context a001 becomes context b001. The addresses are  
> rewritten as per the wrong context, the checksum doesn't find any  
> fault and hopefully there will be a demuxing problem or a session  
> ends up with incorrect data.
> 

I see.  It seems that, for data insertion to occur, it would still
require a shim6 checksum syndrome to another active context, matching
also the ports and, for TCP, falling within the active window.  But you
would lose the additional checksum protection, I agree.

Tom