On May 6, 2008, at 8:51 PM, Tomas L. Byrnes wrote:
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
<http://download.microsoft.com/download/6/8/7/687484ed-8174-496d-8db9-f02b40c...
or http://tinyurl.com/323xb Regards
-----Original Message----- From: Robert Bonomi [mailto:bonomi@mail.r-bonomi.com] Sent: Tuesday, May 06, 2008 3:54 PM To: nanog@merit.edu Subject: Re: [NANOG] Microsoft.com PMTUD black hole?
`
Date: Tue, 06 May 2008 14:29:03 -0700 From: Nathan Anderson/FSR <nathana@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>
_______________________________________________ NANOG mailing list NANOG@nanog.org http://mailman.nanog.org/mailman/listinfo/nanog
_______________________________________________ NANOG mailing list NANOG@nanog.org http://mailman.nanog.org/mailman/listinfo/nanog