[104327] in North American Network Operators' Group
Re: [NANOG] Microsoft.com PMTUD black hole?
daemon@ATHENA.MIT.EDU (Nathan Anderson/FSR)
Tue May 6 21:18:46 2008
Date: Tue, 06 May 2008 18:18:08 -0700
From: Nathan Anderson/FSR <nathana@fsr.com>
To: "Tomas L. Byrnes" <tomb@byrneit.net>
In-Reply-To: <70D072392E56884193E3D2DE09C097A9F133@pascal.zaphodb.org>
Cc: nanog@merit.edu
Errors-To: nanog-bounces@nanog.org
Tomas L. Byrnes wrote:
> Interestingly, Windows XP, Sp3, released today, describes changes in
> PMTUD behavior.
>
> Black Hole Router detection is now on by default:
As I pointed out in my post earlier today timestamped at 2:29PM, I was
using an XP SP3 host to perform my tests with, and it made no
difference. I also used BBR's DrTCP application to make sure that black
hole router detection was, in fact, enabled on my XP box before
commencing my packet captures.
I cannot explain why it made no difference, but at the same time I don't
know enough about how WinNT's black hole router detection works to begin
speculating at this point. I do plan on looking into it, however.
--
Nathan Anderson
First Step Internet, LLC
nathana@fsr.com
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