[NANOG] Microsoft.com PMTUD black hole?
Tomas L. Byrnes
tomb at byrneit.net
Wed May 7 00:51:44 UTC 2008
Interestingly, Windows XP, Sp3, released today, describes changes in
PMTUD behavior.
Black Hole Router detection is now on by default:
http://download.microsoft.com/download/6/8/7/687484ed-8174-496d-8db9-f02
b40c12982/Overview%20of%20Windows%20XP%20Service%20Pack%203.pdf
> -----Original Message-----
> From: Robert Bonomi [mailto:bonomi at mail.r-bonomi.com]
> Sent: Tuesday, May 06, 2008 3:54 PM
> To: nanog at merit.edu
> Subject: Re: [NANOG] Microsoft.com PMTUD black hole?
>
> `
>
> > Date: Tue, 06 May 2008 14:29:03 -0700
> > From: Nathan Anderson/FSR <nathana at fsr.com>
> > Subject: Re: [NANOG] Microsoft.com PMTUD black hole?
> >
> >
> > Now, although that makes sense, in order to avoid issues
> like the one
> > we are facing with Microsoft, would it not make _more_
> sense for the
> > stack to look at the PMTU cache first, and then adjust its own MSS
> > just for connections to that one host?
>
> This _is_ Microsoft we're talking about, remember. 'sense'
> and 'Microsoft'
> are, at a =minimum= orthogonal to each other -- and may not
> even inhabit the same address-space. <wry grin>
>
> As for standards, it is official Microsoft policy to "embrace
> and extend",
> not to implement in a way compatible with the rest of the
> world. *sigh*
>
> I -don't- believe the rumor that "PMTUD/Vista Ultimate" sends
> incrementally increasing-size packets, and uses the first one
> that -doesn't- get through
> as the size limit. <giggle>
>
>
>
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