Single homed on Cogent.* is a problem. Their network is known for being cheap, not resilient. Last time I was involved in a Cogent install for a customer, all of their distribution devices connected to a SINGLE core at a major south-central US carrier hotel. True device redundancy required a wave to another building. Pretty of absurd IMO for a carrier that likes to play “holier than thou” with peering.

-Matt

On Sun, Mar 29, 2020 at 9:42 AM Mike Hammett <nanog@ics-il.net> wrote:
I did error somewhere, yes. If I didn't read that part, didn't send the right link, etc. Not sure.

Yeah, single-homed on Cogent IPv6 is a problem.

Maybe I just assumed that if you had transit from someone, that you got IPv4 and IPv6 service with them. Who doesn't do that?


From: "Radu-Adrian Feurdean" <nanog@radu-adrian.feurdean.net>
To: "NANOG" <nanog@nanog.org>
Sent: Saturday, March 28, 2020 10:22:24 PM
Subject: Free.fr vs HE.net IPv6 (Was: CISA: Guidance on the Essential Critical Infrastructure Workforce)


On Sat, Mar 28, 2020, at 19:52, Mike Hammett wrote:
> https://radar.qrator.net/as12322/providers#startDate=2019-12-27&endDate=2020-03-27&tab=current

Did you read the part about *IPv6* traffic ?
Your link points to some IPv*4* relationship. Over IPv6, you get this :

https://radar.qrator.net/as12322/ipv6-providers#startDate=2019-12-29&endDate=2020-03-29&tab=current

Note the "Active Now" part, which is only active for Cogent.

And then, rather than taking QRator (which does a good job and has interesting information on a number of things - who buys transit from who *NOT* being one of those things - or at least not the public information) as word of absolute truth, did you test that bgp.he.net thinks about this ? Since HE is one of the parties, it does make sense to check their tools to see their point of view.

Long story short:
 - Free.fr in known in France (where I happen to live and work) for only having Cogent as a transit for the last few years.
 - they are also known to peer (like "only exchange own routes and customer routes") with some "very big" networks (usually called "tier-1") : level3 and zayo among them.
 - Cogent and HE over IPv6 ... I suppose everybody knows the story.....
 - Free.fr depeered he.net about one week ago...

There have been some exchanges of tentative traceroutes in both directions on FRnOG (French NOG) and things are clear : free.fr and he.net cannot exchange IPv6 traffic.

--
Matt Erculiani
ERCUL-ARIN