nanog mailing list archives

Re: smurf


From: Wayne Bouchard <web () typo org>
Date: Mon, 8 Dec 1997 11:39:45 -0700 (MST)

Since so far 6 people misunderstood this, I *meant* those networks
that don't need to permit it, should consider filtering inbound ICMP
echo request packets. (And, hence, blocking the spoofed packet from
causing an ICMP echo reply flood.)

Adrian Chadd writes...

A couple of problems:

* Filtering ALL ICMP is pretty silly, ICMP is there for more than just
  pings, and some of it is important.

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