I am using netplan as shown in our tutorial. I have not actively set up anything else. In the netplan config networkd is specified as the renderer.
I only have the configuration mentioned here in my netplan. I have no other networking configurations. I am happy to check if you tell me what to look for. But ifupdown is not installed.
So eth0 and lxdbr0 should be set to accept_ra = 0 ?
How do I check if there is a problem with the built in dnsmasq of lxdbr0?
Could net.ipv6.icmp.ratelimit = 1000 be too small?