No route to some AS nets from AS3320 (DTAG)

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


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 - 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.
> When using their looking glass, there is no route to the net
> 2610:20::/32.

We see 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...?

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