i wanna be a kpn peer

David Freedman david.freedman at uk.clara.net
Fri Jan 12 17:27:54 UTC 2007

Randy Bush wrote:
> route-views.oregon-ix.net>sh ip bg
> BGP routing table entry for, version 2
> Paths: (1 available, best #1, table Default-IP-Routing-Table)
>   Not advertised to any peer
>   286
> from (
>       Origin IGP, localpref 100, valid, external, best
>       Community: 286:286 286:3031 286:3809

Well, if you take a look at the communities here, from what they publish 
in the text of the AS286 AUT-NUM object in the RIPE database:

286:286  Customer routes
286:3031 Customer in Amsterdam

286:3089 No description

I've no idea what 286:3089 is since its not described but it appears
that all prefixes tagged with 286:3089 have 286 as the origin.

Taking a look at these they appear to be customers.

So it could be that these are prefixes that do not belong to KPN
but are advertised by KPN themselves (or rather, with KPN as the origin)
probably because the customer in question does not have an ASN (or at 
least a non-private ASN)

So its entirely possible this could be a leak of a default from a 
private ASN customer that KPN carried in their backbone.

Of course, since they are providing RV a full feed, not the same as they 
would to their peers, this should not be a problem for anybody else 
except KPN (and their customer).

The sensible thing to have done would be to have informed KPN privately.


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