[NANOG] Microsoft.com PMTUD black hole?

Wed May 7 01:06:18 UTC 2008

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-f02b40c12982/Overview%20of%20Windows%20XP%20Service%20Pack%203.pdf 
 >

or

http://tinyurl.com/323xb

Regards

>
>> -----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>
>>
>>
>>
>> _______________________________________________
>> NANOG mailing list
>> NANOG at nanog.org
>> http://mailman.nanog.org/mailman/listinfo/nanog
>>
>
> _______________________________________________
> NANOG mailing list
> NANOG at nanog.org
> http://mailman.nanog.org/mailman/listinfo/nanog