Help wanted! Tried many tutorials, still confused. Any help appreciated!

admin

My family network router bridged (with IPv6), soft routing can also get IPv6, and the LAN port of the NAS connected to the hard router can also get IPv6. The key is that after using the lucky domain reverse proxy, the outside can access the device through the router. However, how do devices in the LAN port of the hard router set up so that they can access the outside? I summarized that no matter whether it's a soft router or a hard router, the IP address range at the front is the same, and the domain resolution is the same as well (only some differences later). I've read many posts about port forwarding and firewall opening but didn't understand anything. Could anyone help me clarify?