1::1/128 + 2::2/128 - GRH Anomalies Delta (2012-08-17)

Daniel Roesen dr at cluenet.de
Fri Aug 17 12:41:20 CEST 2012

Hi Jeroen,

On Fri, Aug 17, 2012 at 11:57:51AM +0200, Jeroen Massar wrote:
> /128's.... and in non 2000::/3 space? Really!?
>  ::/0                     Default Route
> +1::1/128                 Unallocated prefix
> +2::2/128                 Unallocated prefix
>  64:ff9b::/96             Unallocated prefix
>  2000::/3                 Default Route

The problem with GRH is that people tend to send unfiltered IBGP to it
instead of a properly filtered EBGP stream. Thus GRH sees all kind of
more-specific/internal junk that noone else will see, resulting in
"false positives".

To me, this report will only have a real meaning when all GRH peers are
only sending an EBGP feed which they would also send a downstream BGP
customer. Unfortunately, that's largely not the case so I stopped
looking at the report a looong time ago.

Best regards,

CLUE-RIPE -- Jabber: dr at cluenet.de -- dr at IRCnet -- PGP: 0xA85C8AA0

More information about the ipv6-ops mailing list