Otherwise Tor refuses to start with "cannot bind to [<ipv6>]" . Under Debian it works to tweak [1] the systemd-networkd-wait-online systemd service, but I'm unsure how Gentoo does handle this? [1] https://github.com/toralf/tor-relays/commit/c51b3063d9493009dbbb5b92676551eb0802c6ed