Re: pingability of 2600::

[Brandon Martin via NANOG <nanog () lists nanog org>]

On 1/15/26 14:30, Marco Moock via NANOG wrote:
> Hello!
>
> Cogent operates a machine on 2600::. IIRC there was also a route to
> sprint for that net, but that seems to be gone.
>
> I can ping that via my ISP (AS8820) that uses Cogent as its current
> default uplink.
>
> Although, I cannot ping that from various other ISPs, e.g. HE AS6939 or
> DTAG 3320 (no route).
>
> Some other people reported issues years ago:
> https://www.reddit.com/r/ipv6/comments/1bzfqzn/2600_is_no_longer_pingable/
>
> Do some people know more about that case?

Cogent is well known for having incomplete global IPv6 connectivity.

Does your network have a route to 2600::?  Does Cogent have a route to 
your network?  If you're on AS6939, the answer to both of those is 
probably "no".  Obviously in that case, you're not going to be able to 
ping it even if there's a host there listening and willing to respond.

Back when it was Sprint, the routing policy would have been different, 
but Cogent has completely absorbed the Sprint IP network and turned it 
into "more Cogent".

--
Brandon Martin
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