SMURF amplifier block list

Jay R. Ashworth jra at
Mon Apr 20 00:39:41 UTC 1998

On Sat, Apr 18, 1998 at 12:39:29PM -0500, Dan Boehlke wrote:
> On Sat, 18 Apr 1998, Alex P. Rudnev wrote:
> > Why don't use the filter
> >  deny icmp any echo-request
> > on the incoming lines? It just block 99.999% of this smurf amplifiers; 
> > and I hardly think someone eve sence this restriction for the real PING 
> > tests.
> What about people who didn't subnet their class B on the eight bit 
> boundry, but made larger subnets instead?  What about the class B that 
> doesn't appear to be subnetted at all?  What about supernetted class C 
> networks?  A trailing .255 can be a valid host.

Yes, Dan, but any potential smurf-_amplifier_ who might need to do this
_knows_ this about _their own network_, and can adjust accordingly.

-- jra

Jay R. Ashworth                                                jra at
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