Thanks for pointing this out and in retrospect I feel stupid! After following
# IPv6-Support for Docker
Before enabling IPv6-Support for Docker, please note that there are still some unresolved problems in regards to IPv6-Support in Docker. See https://github.com/nextcloud/all-in-one/discussions/2557 for more details on this.
Now that this was mentioned, see the instructions below on how to enable IPv6 for Docker.
## Docker on Linux and Docker-rootless
1. Edit `/etc/docker/daemon.json` (or `~/.config/docker/daemon.json` in case of docker-rootless), set the `ipv6` key to `true` and the `fixed-cidr-v6` key to your IPv6 subnet. In this example we are setting it to `fd12:3456:789a:1::/64`. Additionally set `experimental` to `true` and `ip6tables` to `true` as well. If you are using mailcow and enabled IPv6 with the update.sh, you can keep their daemon.json, it will work too.
```json
{
"ipv6": true,
"fixed-cidr-v6": "fd12:3456:789a:1::/64",
"experimental": true,
"ip6tables": true
}
```
Save the file.
show original
and
to enable IPv6 for Docker and recreate the Docker network with IPv6 support, the container got an IPv6 address and can connect to anything, also to itself.
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