Great Suggestion for the DNS problem...?

Mikael Abrahamsson swmike at
Fri Aug 29 01:46:28 CDT 2008

On Thu, 28 Aug 2008, Brian Dickson wrote:

> However, if *AS-path* filtering is done based on IRR data, specifically 
> on the as-sets of customers and customers' customers etc., then the 
> attack *can* be prevented.

Yes, but I can't do this for everybody else. Doing AS-path and prefix 
filtering (matching that a certain prefix can only be announced by a 
certain AS) doesn't scale in IOS for instance.

We do prefix filtering for OUR customers, but there is no feasable way for 
me to do this for everybody else. I think this needs to be fixed, but it 
involves something new that isn't present today, and I think it needs to 
involve vendors because they need to produce new code to handle it.

Mikael Abrahamsson    email: swmike at

More information about the NANOG mailing list