unreach problems

[Paul Cairney]

On Fri, Oct 20, 2006 at 10:59:47AM +0100, Jeroen Massar wrote:
> Carlos Friacas wrote:
> > On Fri, 20 Oct 2006, Max Tulyev wrote:
> > 
> >> Hi!
> >>
> >> I'm continuing investigating why IPv6-enabled DNS runs awful for me.
> >>
> >> Yet another UltraDNS unreachable host 2001:502:d399::44. It is
> >> authoritative for net.uk domain:
> >>
> >>
> >> Can anybody reach it?
> > 
> > not getting the route... :-(((
> > 
> > i guess that GRH also can't see it, atm.
> 
> Actually, at the moment I just looked, it does:
> 
> grh.sixxs.net> show bgp 2001:502:d399::44
> BGP routing table entry for 2001:502:d399::/48
> Paths: (1 available, best #1, table Default-IP-Routing-Table)
>   Not advertised to any peer
>   3327 6667 8586 2914 12008
>     2001:ad0:fe:0:205:32ff:fe03:c650 from
> 2001:ad0:fe:0:205:32ff:fe03:c650 (212.47.200.1)
>       Origin IGP, localpref 100, valid, external, best
>       Community: 3327:202 6667:3001 6667:4004 6667:5209 6667:5210 6667:6000
>       Last update: Thu Oct 12 19:38:29 2006
> 
> Seems that it is there since 12th of oct. Strangely enough 2914/Verio
> does not seem to pass it on to GRH though, thus it might just be a ghost.
> 

>From http://info.us.bb.verio.net/routing.html#v6PeerFilter :

"NTT Communications accepts /19 through /32, and /35 from 2001::/16 (global unicast allocations)"

They seem to be willing to accept shorter prefixes from customers however will advertise these on to customer but not their peers.

Paul