[NANOG] Microsoft.com PMTUD black hole? (working with Microsoft on issues)

Niels Bakker niels=nanog at bakker.net
Thu May 8 17:44:34 CDT 2008

* netgeek at bgp4.net (Janet Sullivan) [Thu 08 May 2008, 23:35 CEST]:
>1) Yes, Microsoft blocks ICMP for the most part, which will break Path 
>MTU Discovery.  This is a known issue.  If you run into it, its most 
>likely because the servers you are trying to talk to in MS-land don't 
>have black hole router detection turned on.

I find it hilarious that one part of the company had to come up with a 
hack to work around the inability of another part of the company to 
understand how TCP/IP works

	-- Niels.


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