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Re: SMURF amplifier block list

  • From: jlixfeld
  • Date: Fri Apr 17 15:57:22 1998

Why not just block them at your interface with an access-list (firewall)

On Tue, 14 Apr 1998, Forrest W. Christian wrote:

:On Tue, 14 Apr 1998, Hank Nussbacher wrote:
:> All outgoing pkts to now should go to Null0.  I am sure
:> one can improve on the logic even more.
:Exactly.  All OUTGOING packets.   Not Incoming. Not the smurf attack
:packets which are swamping your downstream customer, which have a source
:address from
:I will concede that shutting off connectivity to a site by a large enough
:chunk of the net should get someone to fix stuff....  But part of the
:advantage of the MAPS RBL BGP feed is that it helps to cut down spam
:coming into your network.  A BGP feed TODAY won't block a ping
:amplification attack aimed at your network or a downstream.  All it will
:do is prevent your customers from using the ping amplification networks to
:launch an attack.   And, if you have the appropriate anti-spoofing filters
:in place, they shouldn't be able to attack anything other than the valid
:source addresses you have in your outbound filter set.
:- Forrest W. Christian ( 
:iMach, Ltd., P.O. Box 5749, Helena, MT 59604
:Solutions for your high-tech problems.                  (406)-442-6648


Jason A. Lixfeld   
iDirect Network Operations

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