#IPv6 adoption is still terrible.

Akamai, Cloudflare, and Google all report roughly 45% of traffic to their services using IPv6 in the US...

https://www.akamai.com/security-research/ipv6-adoption-visualization

...but that's (a) not all that great, and (b) only HTTP traffic to major services.

Just what % of sites actually _offers_ IPv6? I took a look...

#IPv6 adoption is still terrible.

Akamai, Cloudflare, and Google all report roughly 45% of traffic to their services using IPv6 in the US...

https://www.akamai.com/security-research/ipv6-adoption-visualization

...but that's (a) not all that great, and (b) only HTTP traffic to major services.

Just what % of sites actually _offers_ IPv6? I took a look...

#IPv6 was defined in RFC1883 in December of 1995.

That's right, IPv6 is now *30* frickin' years old. I've spent at least 25 of those yelling at people, companies, service providers, and many engineers who really should know better that they need to enable it.

Doesn't look like 2026 is going to change that. Le sigh.

#IPv6 was defined in RFC1883 in December of 1995.

That's right, IPv6 is now *30* frickin' years old. I've spent at least 25 of those yelling at people, companies, service providers, and many engineers who really should know better that they need to enable it.

Doesn't look like 2026 is going to change that. Le sigh.

I have this weird #IPv6 problem and it's driving me crazy.

So, hear me out.

I have a #wireguard tunnel set up to a VPS because my ISP doesn't offer IPv6. So all IPv6 traffic is routed over the tunnel. Obviously, this means the MTU should be reduced, so I've configured radvd to broadcast an MTU of 1420.

All fine. IPv6 works. I can visit websites, stream audio and video, ssh all over the place, all over IPv6.

Except for #thunderbird. It'll take ages trying to send an email, then complain the server timed out. It'll be unable to save drafts or sent mail to the imap server, complaining about server timeouts.

So I try sending mail with msmtp from the same machine, all is well, no timeouts whatsoever. It's just thunderbird that's being difficult.

I've been staring at this problem for weeks now, done all sorts of tcpdumps along the path from my computer to my mail server. Double-checked that ICMP6 type 2 is passed along neatly across all firewalls involved.

It's got me stumped.

I'm not expecting anyone reading this to be able to provide a solution, I just wanted to share that it's driving me crazy!

#SelfHosting

@raspbeguy @subnetspider Sorry, I took a screenshot after mousing around the plot and the most recent data point I saw was ancient history. Not very illustrative! Here's a screenshot with Sept 20 2025 data. #IPv6

IPv6 traffic at Google is brushing up against 50%. https://www.google.com/intl/en/ipv6/statistics.html
#IPv6