Re: 12/8 problems?

[Richard A Steenbergen <ras () e-gerbil net>]

On Fri, Sep 09, 2005 at 11:12:25AM -0400, Drew Linsalata wrote:
> Apologies for a post of an operational nature, but is anyone else seeing 
> problems with AT&Ts 12/8 block?
>
> From a New York router connected to Global Crossing and Peer 1:
>
> border-1.nycmny> sh ip bgp 12.xxx.xxx.xxx
>
> BGP routing table entry for 12.0.0.0/8, version 86901457
> Paths: (2 available, best #1)
>   Not advertised to any peer
>   3549 12956 26210
>     64.213.176.97 from 64.213.176.97 (208.50.59.1)
>       Origin incomplete, metric 2602, localpref 100, valid, external, 
> best, ref 2
>       Community: 232589665 232618104
>   13768 12956 26210, (received-only)
>     64.34.84.117 from 64.34.84.117 (216.187.124.10)
>       Origin incomplete, localpref 100, external, ref 2
>
> Route views is showing a 12/8 with a fair amount of dampening/flap 
> penalties in the last 10-12 minutes.

Looks like 12956 is announcing some /8s to every peer and transit. Worse 
still, Sprint and GX are propagating it. This is not the first time that 
Telefonica has leaked a lot of garbage routes with serious network impact 
as a result (nor is it the second or third, actually).

12.0.0.0/8
64.0.0.0/8
65.0.0.0/8 

I'd say both GX and Sprint have a lot to answer for right about now.

-- 
Richard A Steenbergen <ras () e-gerbil net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)