Q: So, anything new? What'd you do today?
A: Oh, dug through menus in a new AV receiver to find its MAC addresses, configured my network DHCP server to give it a static address, and then wrote some iptables rules to keep that address from being able to reach outside the LAN. Pretty standard stuff.
Looking for a "DO NOT CONNECT THIS MACHINE TO THE INTERNET NO MATTER HOW MUCH IT NAGS" warning sign to print out.