Public shaming list for ISPs announcing other ISPs IP space by mistake

Mikael Abrahamsson swmike at
Wed Aug 13 15:56:01 CDT 2008

On Wed, 13 Aug 2008, Jared Mauch wrote:

> 	these are all issues, but operational?  depends. If LLNW is not 
> being filtered by telecom italia, time for 6762 to fix that.  If they 
> persist, will you depeer them as a security risk until they clean up 
> their act?

I just discovered (via bgplay) that 22822 first originated the prefix via 
5511 (france telecom), then it was withdrawn a while later, and then 
originated via 6762, and then withdrawn again. An hour or so between these 

We all know we don't filter our peers (there is no operationally sane way 
of doing this today), so the question is how to make ISPs filter their 
customers more sanely.

We have prefix-filters on our customer bgp sessions, so that should be 
fairly safe, but I see no good way of doing this towards peers as there is 
no uniform way of doing this, and there is no industry consenus how it 
should be done.

Mikael Abrahamsson    email: swmike at

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