2600:: No longer pings

Sat Apr 6 10:19:57 UTC 2024

I don't know what happed to 2600::, but 2a09:: and 2a11:: can be used as
alternatives. These are addresses of https://dns.sb/ running by xTom.

> -----Original Message-----
> From: NANOG <nanog-bounces+soha=lohu.info at nanog.org> On Behalf Of Ben
> Cartwright-Cox via NANOG
> Sent: Saturday, April 6, 2024 6:01 PM
> To: North American Network Operators' Group <nanog at nanog.org>
> Subject: 2600:: No longer pings
> 
> It appears that 2600:: no longer responds to ICMP.
> 
> $ mtr -rwc 1 2600::
> Start: 2024-04-06T10:53:41+0100
> HOST: metropolis                                  Loss%
>   1.|-- lcy02.flat.b621.net                          0.0%
> [...]
>   6.|-- ldn-b4-link.ip.twelve99.net                  0.0%
>   7.|-- ldn-bb1-v6.ip.twelve99.net                   0.0%
>   8.|-- nyk-bb2-v6.ip.twelve99.net                   0.0%
>   9.|-- ???                                         100.0
>  10.|-- sprint-ic301620-nyk-b5.ip.twelve99-cust.net  0.0%
>  11.|-- ???                                         100.0
> 
> This seems to have happened around Friday 5th 13:40 UTC.
> 
> 2600::, a IP address owned by the Sprint network (Now since acquired by Cogent
> Communications) is a common (at least in my circles) IPv6 testing address, in a
> similar way that 8.8.8.8 or 1.1.1.1 is for a quick address to remember that always
> pings, when such a address is so easy to remember, you sometimes cannot help it
> becoming a "core project" :) ( https://xkcd.com/1361/ )
> 
> 2600:: is also used to be the address of sprint.net, now sprint.net has no v6.
> 
> This is sad, and I would either propose that Cogent/Sprint (I assume
> 2600:: is under the ownership of Cogent now) revive this address as it's a very
> helpful testing address that is burned into the minds of many. Or at the very least,
> I'm more than willing to tank the effort of responding to ICMP!