[e2e] TCP Loss Differentiation

Lars Eggert lars.eggert at nokia.com
Mon Feb 23 08:12:06 PST 2009


On 2009-2-21, at 3:46, David P. Reed wrote:
> I think we have no serious debate on any of these things.  I know
> Cisco's products support ECN, it's really an endpoint stack problem,  
> and
> the word "lead" was meant to suggest use of Cisco's bully pulpit  
> (white
> papers, etc.).

FYI - and this may be clear to you but maybe not to everyone - it's  
not so much an endpoint problem in the sense that ECN wasn't  
implemented, it's an endpoint problem in the sense that turning it on  
makes broken middleboxes misbehave, to a degree where Microsoft for  
example has decided to leave it off in Vista. See Dave Thaler's slides  
from a recent IETF meeting:

http://www.ietf.org/proceedings/07mar/slides/tsvarea-3/sld6.htm (and  
the one following)

So we're realistically looking at a deployment delay of max(OS upgrade  
cycle, NAT upgrade cycle).

That same slide deck has interesting information on the deployment  
feasibility of several other TCP features (window scaling, DSACK, F- 

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