> Unfortunately, it seems that support for automatically configuring multiple addresses is quite poor. What? SLAAC configures addresses on all -er- not-expired

> Unfortunately, it seems that support for automatically configuring multiple addresses is quite poor. What? SLAAC configures addresses on all -er- not-expired prefixes advertised on the link. So, if the border router advertises a ULA prefix and a globally-routeable prefix, SLAAC assigns two addresses to the computer. If whatever network-configuration tooling you're using causes your computer to not generate an address for every advertised prefix (and you've not told the tooling to behave in this way) then it's broken.