On Fri, 19 Jul 2019, Phil Karn wrote: ... Some home router firmwares seem to insist on /64 for using the delegation, so it might be tricky on some setups. But should be possible to put together at least on a Linux box with some creative configuration. Right, for most applications "completely rewritten" is not true; just some small parts need to be rewritten in software which uses older low-level network socket APIs. Applications using higher-level networking APIs (such as "fetch this URL for me please" APIs in libraries and operating systems) don't need to be touched as the code behind those APIs has already been fixed years ago. I've got a lot of experience in IPv6 support validation and configuration at $work, and with my hobby systems too, so I know this from practice. Applications specifically dealing with things as IP address allocation or DNS data manipulation: yes, those need a lot more work. Such as the amprnet address allocation portal. Not a small task. Right, but this thing needs to be done eventually. The world is moving on. It's a good idea to check this graph yearly, stare at the growth between 2015 and today for a while, do a little mental extrapolation from there, and think of the consequences: https://www.google.com/intl/en/ipv6/statistics.html Some 25% to 30% of client traffic to Google use IPv6 *today*. Up from 5% at the beginning of 2015. There's some weekly variance due to office/home use if you zoom in (weekends: more IPv6 traffic towards Google). It's getting turned on a lot right now. The wheel is rolling, the momentum is there. As for the difficulty: I didn't find it that hard. The addresses are harder to remember. More cut-n-paste work, but a lot of it can be automated, and DNS help once you bother to set it up. But the routing is... basically just the same as IPv4, just with more bits! Commercial hardware hardware and software vendors are moving pretty fast, and have mostly implemented IPv6 already. All major network operators, ISPs and such absolutely *require* IPv6 support when purchasing anything, and have done so for quite some time. Smaller vendors are lagging more (think of the APRS iGate appliances, remoterig boxes, and other gadgets made for small audiences). But I suspect the ease of setting up direct remote access to those gadgets, thanks to the lack of NAT in IPv6-enabled residential networks, will get that ball moving soon. Just open up the firewall - the thing will have it's own public IPv6 address just like that, no need to do port forwarding! - Hessu, OH7LZB / AF5QT