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Do they run nat64 or something for reaching the ip4'ternet?

The standard is called Dual-Stack Light, which means you are getting a native IPv6 adress and your IPv4 traffic runs through a carrier-grade NAT. This is necessary, because the cable-providers here in Germany came to late to the Game and got to little IPv4 Chuncks. For normal users this is a good solution, when the NATing service is stable enough. (Sometimes the server is down and you are forced to IPv6 only..) But throug the carrier-grade NAT, you can not run your own services, like a teamspreak server etc.

Do they let you run services on ipv6 easily, ie unfiltered access and firewall control?

Nope, at least not for Unitymedia. There's a IPv6 firewall, but without rules - you can just switch it on or off, making it unsuitable for pretty much any service hosting - you either have to expose your entire network, or you cannot access anything at all.

For 5€/month, they will issue a better router with a full-features firewall, though.

justincormack: Yes, you can set up an IPv6 service on your connection if you like. The only problem for IPv4 services is the lack of your own global IPv4 address.

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