Funny trace of the day

[Daniel Roesen]

On Wed, Jun 29, 2005 at 02:20:07PM +0200, Daniel Roesen wrote:
>  5  if-11-0-1-459.6bb1.AD1-Amsterdam.ipv6.teleglobe.net (2001:5a0:200::15)  3.342 ms  5.451 ms  3.043 ms
>  6  gin-mtt-6bb1.ipv6.teleglobe.net (2001:5a0:300::1)  90.268 ms 115.456 ms  90.385 ms
>  7  tu-viagenie.ipv6.noris.de (2001:780::b)  116.046 ms  140.328 ms 120.178 ms
>  8  3ffe:b00:c18::6b (3ffe:b00:c18::6b)  199.959 ms  201.08 ms  193.336 ms
> 
> Seems like hop 7 (noris.de, small german ISP) forwards a ~fullish table
> to their Upstream Teleglobe, who happily accept anything obviously.

And somethings, things are completely different than they look. The
mistake of believing DNS reverse. :-)

Word is, that the Noris-Tunnel is long gone, but Teleglobe's router
(hop 7) possibly still having it configured, and router answering with
wrong IP address as source for the ICMPv6 hop count exceeded. Looking
at the hop RTTs that makes sense too. Hop 5 is Amsterdam, Hop 6 might be
US east coast, hop 7 Teleglobe US west coast. Hop 8 is already Viagenie
Canada.

The AS_PATH as seen at io.nl confirms that:
AS path: 6453 10566 6939 4716 6175 3292 I
No Noris inside there.

Teleglobe: could you take a look at your hop 7 router?
Noris: sorry for the noise, you are not involved. :-)


Best regards,
Daniel

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