No route to some AS nets from AS3320 (DTAG)

[Marco Moock]

Am 19.04.2024 um 10:45:36 Uhr schrieb Gert Doering:

> 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).

32 was a typo by me.

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

Although, via probes in your AS, the destination is reachable.
https://atlas.ripe.net/measurements/70099007/#probes


-- 
Gruß
Marco

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