If that anecdote is true, they're doing something wrong. What I hear is there 
is no performance impact in general, with some reports of bulk data moving 
faster with IPv6 (probably due to some kind of MTU issue).

Regards
   Brian Carpenter

On 14-Jul-22 09:16, Juha Saarinen wrote:
Anecdotally, I’m hearing that some smaller ISPs don’t run IPv6 on their 
networks because it kills performance for their customers.

Doesn’t seem like the right way to fix the issue, but small budgets etc.

–
Juha Saarinen
https://twitter.com/juhasaarinen

On 14/07/2022, at 08:52, Matt Brown <m...@mattb.net.nz> wrote:


Globally https://www.google.com/intl/en/ipv6/statistics.html 
<https://www.google.com/intl/en/ipv6/statistics.html> shows steady growth, and 
just passed the 40% native IPV6 mark. It's slow but steady progress given the 
enormity of the protocol changes introduced and the lack of backward compatibility.

However 
https://www.google.com/intl/en/ipv6/statistics.html#tab=per-country-ipv6-adoption 
<https://www.google.com/intl/en/ipv6/statistics.html#tab=per-country-ipv6-adoption>
 does show NZ is lagging the average on only 19% - anecdotally, none of the 3 ISPs 
I've used recently for various residential connections  have made it possible to get 
IPv6 - Starlink did for a few months initially, but then it disappeared when they 
moved to their NZ routed ranges :(


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