Allow enabling experimental ip6tables option with Docker 20.10

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Docker recently gained the option to also set IPv6 NAT rules to forward IPv6 traffic to containers:


It is relatively easy to enable, but requires enabling experimental features. As a quick test, I added this daemon.json to a Debian VM that has Docker 20.10 installed:


  "ipv6": true,
  "ip6tables": true,
  "experimental": true,
  "fixed-cidr-v6": "fd00:dead:beef::/48"


Now Docker will automatically create IPv6 NAT rules to forward ports to containers:


root@debian:~# docker run --rm -p 80:80 nginx
fd15:4ba5:5a2b:1008:c87b:a4ed:6798:4006 - - [11/Apr/2021:12:08:29 +0000] "GET / HTTP/1.1" 200 612 "-" "curl/7.64.1" "-"


I'm using IPv6 a lot and would love it to be able to forward IPv6 traffic with this option. Not sure when Unraid would be able to update to 20.10, as 6.9 seems to be using 19.03 for now, but I wanted to add this feature request anyway.

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