In the next months/years my ISP might give me IPv6 for my home connection. But what are the security implications? Will local network servers/embedded devices be accessible from the whole internet?
In IPv4 you were protected by the NAT. Many services and embedded devices like network printers have a local adress but listen to any incoming connection (0.0.0.0 at IPv4). If they should be reachable from the internet, port forwarding or upnp were your options (including some infamous security cameras beeing accessible via upnp without password by default from the internet).
When my ISP switches me to IPv6 are those accessible from the internet/do I need to create firewall rules on my home router (similar to port forwarding)/will there be something like UPnP for programms like bittorrent? Are there other security considerations? Will it end like this https://serverfault.com/questions/766890/network-printer-exploited-read-hacked-to-print-antisemitic-documents-how-to ?
If this is model/ISP specific, feel free to assume a common configuration (preferable in central Europe).