are there quintillions of states

you’ll never believe this

i don’t use ubiquiti, but the only thing you need to do with your firewall to get better-than-NAT security is allow only outgoing connections/disallow incoming connections. usually on consumer routers that’s the default setting anyway or there’s a checkbox to that effect.

i’ve done both ipv4 and v6, but never embedded. from my perspective, ipv6 addresses can be easier to remember and use, with a little clever arrangement of zeros and especially because they’re hexadecimal. that’s in addition to the way more elegant way the protocol itself handles various things. obviously not worth upgrading systems that don’t even need dhcp, but that applies to a lot of things in that field

you can if you make it mostly zero

is a /56 not enough address space for your home network