I tried to set up IPv6 a while ago, and it looked simple at first. After configuring the router - just flipping "enable ipv6" in gui - my machine got 10 IPv6 ad

I tried to set up IPv6 a while ago, and it looked simple at first. After configuring the router - just flipping "enable ipv6" in gui - my machine got 10 IPv6 addresses (why this many? I don't know). Cool. I then set up the firewall to expose one of these addresses and I could ssh to my machine from the outside world. A win! Unfortunately the win was short lived. Eventually I lost the ability to ssh in. It turned out that the 10 IPv6 addresses were replaced by a different bunch of 10 addresses. So I would have to reconfigure the firewall again. I decided it was too much work for me and disabled IPv6. Maybe some other time.