You may enjoy the parts on ARP at the end of the post. I am planning a post on HA K3s with etcd on netbooted RPis. The netbooted RPi part is already available for free to my GitHub Sponsors. Here's a gist I put together whilst figuring out how it should look: https://gist.github.com/alexellis/09b708a8ddeeb1aa07ec276cd8...

Not sure what you mean re: "network virtualisation" though?