[6bone] 2001:470::/35 ghost routes.

[Gert Doering]

hi,

On Wed, Aug 14, 2002 at 01:38:59PM +0100, Edward Brocklesby wrote:
> So.. I think there is a problem ;-).
> 
> Let's see output of another bgp route:
> 
> BGP routing table entry for 2001:470::/35

Ghosts again.  Here is what I have for this prefix:

  1930 1916 11537 786 5623 9044 10566 10109 7660 2500 2497 3549 8002 278 6939
  3292 6830 8758 9044 10566 10109 7660 2500 2497 3549 8002 278 6939
  4554 5609 5623 9044 10566 10109 7660 2500 2497 3549 8002 278 6939
  1752 6830 8758 9044 10566 10109 7660 2500 2497 3549 8002 278 6939
  3274 6175 7580 145 11537 22388 7660 2500 2497 3549 8002 278 6939
  109 109 6175 7580 145 11537 22388 7660 2500 2497 3549 8002 278 6939
  9044 10566 10109 7660 2500 2497 3549 8002 278 6939

> Hm, what a strange AS-path this is.  Despite our peering with AS 6939, they
> don't advertise this route.  This is probably because their /35 has changed
> recently to a /32, so in fact this route should not exist -- probably it is a
> ghost route?

Yep, looks like it.

> Let's assume three possible sources; AS9044, AS10566 and AS7660.
> I am inclined to point some blame at AS7660; why?  Well, let's see what 
> fubar looking glass has to say about this route:

>From what I have, I'd also tend to blaim 7660.  They're the only common 
element in all the path tails, while 90444 and 10566 don't even appear in 
two of the paths.

> I see that of the three routes, the only common entry is AS7660.
> Hm, who is this?...

Some AS in Japan, which seems to have been responsible for one of the last
ghosts as well.

[..]
> Well, it seems that this APNIC ASN does not have an entry in APNIC's
> whois database. Hmmm.

Interesting.  Last time I checked, they were visible...

Anyway, whois.ra.net still has them...:

aut-num:       AS7660
as-name:       UNSPECIFIED
descr:         APAN JP Network Operations Center
               1-8-1 Otemachi Chiyoda-ku
               Tokyo, JAPAN

I have no direct contacts there.

> AS10566 is Viagenie, of course; without making any comment myself,
> I'm told by others they have had problems with advertising ghost
> routes in the past,  So maybe it's them.

I don't think so.  I see a path that has no 10566 in it, which implies
that they have fixed their end (even though nobody has heard anything
from them recently, which is a pity).

> Would anyone like to comment on this problem? (or else-- tell me
> to go away ;-) sorry if this is not an appropriate question for
> this list, but maybe it affects 6bone community too..)
> 
> (Maybe too if anyone knows the contact for AS7660 it's useful.)

That would be helpful, yes.  Especially if someone has a good personal
contact and could work with AS7660 to figure out what's going on (some
specific recent software change, or some new product, or whatnot).

AS7660 is a new player in this "ghost game"...

Gert Doering
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