State of cable internet access in Germany in 2019:
1. Accept to install a Fritzbox in bridge mode because all other cable modems are either outrageously expensive or do not work here
2. Choose your contract between no static IP addresses, a semistatic IPv6 address with shared IPv4 via DSlite or a static IPv4 without *any* IPv6 connectivity
3. Get a hurricane electric tunnel to have IPv6 connectivity
4. Block out relevant IPV6 addresses in your DNS so that you can still watch Netflix etc.