[Dagger2]

Note you can also advertise a ULA prefix without the A flag. The advertisement tells other machines that the IP is on-link, and they can use their own GUA addresses to connect without needing a ULA address of their own.

You could also assign a single address (e.g. fd53::1/128) and advertise the corresponding prefix of fd53::1/128, so you don't even need a whole ULA prefix, just individual addresses. (This is sometimes useful if you use a router you can't configure and it's advertising a DNS server you don't want to use.)