Nothing special on the router side. The server machine is connected normally, the same as other devices in my house. I have written a blog about how to enable relay mode for ipv6 for the secondary router, you can check it out here blog.bimal1412.com.np/enable-ipv6-on-a-secondary-…
As, for the other question, yes I am sure it will get tedious if you plan on using it to host something with ipv6 directly from the docker container without tunneling. But I am sure that can be solved by writing a bash script to automate the config to get the new ipv6 gateway if the IPv6 prefix changes.
Rabindra Man Bajracharya
Trying to think rationally
What is your configuration on the router? And won't manually adding ip be tedious as the ipv6 could be dynamic?