No route to some AS nets from AS3320 (DTAG)

Gert Doering gert at space.net
Fri Apr 19 10:45:36 CEST 2024


Hi,

On Fri, Apr 19, 2024 at 09:39:37AM +0200, Marco Moock wrote:
> During some tests I noticed that some As aren't reachable from AS3320,
> but from other AS they are. On the destination AS some systems also
> reply and are productive systems.
> 
> This affects time.nist.gov - a well-known NTP service.
> If affects more, but I will start with that.
> 
> 2610:20:6f97:97::4
> AS49 US National Institute of Standards & Technology
> 
> I also did a RIPE atlas measurement that confirmed the destination is
> reachable from many other ISPs, but not from AS3320.
> https://atlas.ripe.net/measurements/70072736/#probes
> 
> When using their looking glass, there is no route to the net
> 2610:20::/32.

We see time.nist.gov as 2610:20:6f97::/48 - and the /32 does not seem
to exist here either.  (There is a /37, though, and a route6: entry for
the /37 exists - but the /48 is not part of this /37).

This said, there indeed seems to be no route6: (I could find) for the /48...

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

SpaceNet AG                      Vorstand: Sebastian v. Bomhard,
                                           Ingo Lalla, Karin Schuler
Joseph-Dollinger-Bogen 14        Aufsichtsratsvors.: A. Grundner-Culemann
D-80807 Muenchen                 HRB: 136055 (AG Muenchen)
Tel: +49 (0)89/32356-444         USt-IdNr.: DE813185279



More information about the ipv6-ops mailing list