North American Network Operators Group
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Re: smurf, the MCI-developed tracing tools (was Re: Bogus announcement)

  • From: Paul Ferguson
  • Date: Sun Dec 28 13:54:08 1997 
At 12:05 PM 12/28/97 -0600, Karl Denninger wrote:

>
>You don't want to filter ICMPs.  What you want to filter is ANYTHING which
>came from an invalid source address *at your entrance* from your customer
>connections.
>

This is documented in:


 Network Ingress Filtering: Defeating Denial of Service Attacks
  which employ IP Source Address Spoofing;
 draft-ferguson-ingress-filtering-03.txt

At the moment, we're trying to get this evntually published as
an Informational RFC.

More information can be found at:

 ftp://ftp.cert.org/pub/cert_advisories/CA-97.28.Teardrop_Land

- paul