[NANOG] Microsoft.com PMTUD black hole?

Nathan Anderson/FSR nathana at fsr.com
Wed May 7 16:00:27 CDT 2008


Tomas L. Byrnes wrote:

> I'm not sure what the issue is here. 
> 
> Just about every modern firewall I've used has an option to enable PMTU
> on interfaces, while blocking all other ICMP.
> 
> Is MS not running something manufactured in the last 10 years at their
> perimeter?

Not sure, but you actually entered in here to a subthread of the 
original conversation, this one about other possible ways of dealing 
with black hole "ICMP-munchers" in a pre-emptive fashion.  I had a 
brainstorm that I thought would be workable, which is what we were 
discussing here.  Apparently, it turns out my idea was no good. ;-)

The original discussion about MS blocking ICMP to their own servers, 
which is the discussion it sounds like you are looking for, is over 
that-a-way... *points*

-- 
Nathan Anderson
First Step Internet, LLC
nathana at fsr.com




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