Am I the only one who thinks this is disconcerting?

Thu Nov 9 07:41:04 UTC 2023

The other thing it could be is broken PMTUD / failure fragment at network MTU.   We defined socket options to do  this 2 decades ago. 

-- 
Mark Andrews

> On 9 Nov 2023, at 06:00, Matthew Pounsett <matt at conundrum.com> wrote:
> 
> On Wed, Nov 8, 2023 at 2:12 AM Bryan Fields <Bryan at bryanfields.net> wrote:
>> 
>> 
>> Could these be related to the fact that dnsvis.net is trying to reach these
>> servers via IPv6 and I think they use Hurricane for transit.  Since HE and
>> Cogent is a major gap, this causes them to time out trying to reach the C root
>> server over IPv6.
> 
> We have a tunnel set up to allow DNSViz to reach C-root, however
> anything else single-homed on Cogent is unreachable to DNSViz via
> IPv6.