Re: paging all socket geniuses
- From: Glenn Willen <gwillen@xxxxxxxxxxx>
- Date: Thu, 31 Jul 2008 03:37:26 +0200 (CEST)
In article <79babb09-714c-4abb-94bc-e64b48275fdf@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
K Livingston wrote:
Most machines and firewalls are configured to block all ICMP traffic (which
is used for ping among other things) most machines no longer respond to
external ICMP requests.
This is fairly OT, but I just want to point out that if you catch someone doing
this, you should smack them. Lots of people who think they know what they're
doing block ICMP; it turns out, it's _more than just ping_, and you break
important functionality (and in very subtle and hard-to-diagnose ways) when you
do that. Google "path mtu detection blackhole" for more information.
gwillen
.
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