Yes, I contacted the ISP. The reasoning is "that is a limitation/flaw in the firmware of the single router that we provide (and you cannot use your own, or medd

Yes, I contacted the ISP. The reasoning is "that is a limitation/flaw in the firmware of the single router that we provide (and you cannot use your own, or meddle with it). The company behind that product might correct this mistake early 2014 and we will upgrade your routers firmware (you cannot) when we get around. Just.. unplug it every three days for now". That is the official statement, confirmed several times. The manufacturer (AVM) confirmed that they know about this issue and are working on a fix, but didn't want to commit to the early 2014 part.. Meanwhile the ISP gives you no choice to refuse dual stack lite and have a stable internet connection.. Technology: UPNP might be a way to open ports, but that works for IPv4 as well, no? I mean, the benefits of IPv6 lie elsewhere? A global address (for a time.. my prefix changes whenever my ISP likes to do that. I have the same 'unstable' address problem, still need to update my AAAA records all the time to make incoming connections work), independent of firewall issues? If I host a game, it can open a port via upnp (and serve people from the internet) with ipv4 as well. Where is the benefit I'm missing, other than being able to see a dancing tortoise on kame?