Hey everyone! Jens mentioned this bug today during the BSP in Vienna. I think this already got solved a few iterations earlier - at least in Bookworm this looks fine to me where I can simply set "fc01::666/64" (don’t judge the range).
Screenshot: https://cdn.gyptazy.com/images/debian_ipv6_installer_screen.jpg Guess, almost 10yrs later this can be closed? Cheers, gyptazy