Re: [e2e] opening multiple TCP connections getting popular

On 2007-8-30, at 15:18, ext Michael Welzl wrote:
> Does anybody know if there's a generally known, agreed upon reason
> for not using Window Scaling? Google tells me that some broken
> routers can't handle it... but, interestingly, Wikipedia (via
> google :-) ) tells me that, since kernel version 2.6.8, the option
> is enabled in Linux by default, and that it's used (by default? don't
> know) in Vista... so what, are we already heading for trouble?

Microsoft presented their findings related to window scaling (and several other TCP extensions) at the IETF TSVAREA meeting in Prague. See http://www3.ietf.org/proceedings/07mar/slides/tsvarea-3/sld3.htm and the two following slides. Summary: Window scaling is enabled in Vista, but limited to a factor of 2.

PPT slides are here: http://www3.ietf.org/proceedings/07mar/slides/ tsvarea-3/tsvarea-3.ppt

Lars