North American Network Operators Group
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Re: anti-spoofing filters

  • From: RJ Atkinson
  • Date: Sat Jun 23 22:04:57 2001 
At 20:56 23/06/01, Christopher A. Woodfield wrote:

>At a conference in late 1999, UUNet announced that they had anti-spoof 
>filters in place on their dialup ports. Not that that amount to much in 
>contrast to teh amount of spoofed DDOS traffic from cable providers, mind 
>you...IIRC, it's the cable providers that need to put up the anti-spoofing 
>filters the most.

        Mistakes happen in any network, because people are human.  
That noted, the two major Cable ISPs *do* regularly put in 
anti-spoofing filters on their access routers.  

        Anti-spoofing filters wouldn't have helped with the GRC DDOS 
situation though, since the addresses used by the attacking systems 
were *valid* in that case -- according to the GRC web site.

Ran