North American Network Operators Group
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Re: ICMP Blocking Woes

  • From: Sean Donelan
  • Date: Thu Oct 02 02:19:00 2003 
Various ISPs have been trying lots of different ICMP filters.  You can
see some of the impact on the Internet average graphs from XAffire.

http://www.xaffire.com/press/ea/EA20030902_images?rf=EM005

Xaffire/Matrix Systems apparently used ping packets that were the
same size as those being filtered by some ISPs.  According to Xaffire
service providers implementing filters included Cable & Wireless and
Level 3.