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Microsoft.com PMTUD black hole?
\ Nathan Anderson/FSR (6 May 2008)
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Subject:Re: Microsoft.com PMTUD black hole?
Group:Nanog
From:Marshall Eubanks
Date:7 May 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-f02b40c 12982/Overview%20of%20Windows%20XP%20Service%20Pack%203.pdf
>

or

http://tinyurl.com/323xb

Regards

>
>> -----Original Message-----
>> From: Robert Bonomi [mailto:bonomi]
>> Sent: Tuesday, May 06, 2008 3:54 PM
>> To: nanog
>> Subject: Re: [NANOG] Microsoft.com PMTUD black hole?
>>
>> `
>>
>>> Date: Tue, 06 May 2008 14:29:03 -0700
>>> From: Nathan Anderson/FSR <nathana>
>>> 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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>>
>
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