unreach problems

Jeroen Massar jeroen at unfix.org
Fri Oct 20 11:59:47 CEST 2006

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 (
      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.

Having no route is always better than having a broken route, as then
software can quickly decide to fallback onto another address instead
having to wait for the timeout.


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