Hello. I recently decided to move my dnsmasq+6in4 tunnel setup from Raspbian to the latest Ubuntu. To keep a long story short, after some (mis)configuration I ended up with an interface with an IPv6 GUA, but with no LLA  (a bug/oversight in netplan, I guess ). dnsmasq does not protest this and will send RAs sourced with GUA, which will fail validation according to RFC 4861, section 6.1.2. Not really a problem for my case (AFAIK, an interface should never lose/stay without its LLA) , just thought you should know.
Cheers, MZ  Should be reproducible by: ip addr add dev <device> 2001:db8::1/64 ip -6 addr flush dev <device> scope link Then for dnsmasq config, use dhcp-range=::,constructor:<device>,ra-names  https://bugs.launchpad.net/ubuntu/+source/netplan.io/+bug/1810971 _______________________________________________ Dnsmasq-discuss mailing list Dnsmasqemail@example.com http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss