Some day, when your fridge, oven, and yes, teapot all have IP addresses, this will finally come into its own.
http://www.embeddedarm.com/software/arm-netbsd-toaster.php
NetBSD really does run on everything.
Why wouldn't you give everything its own unique IP and then limit access via firewalls? NAT just makes p2p a huge pain.
I would like to take this opportunity to direct your attention towards the venerable http://nicecupofteaandasitdown.com which is both splendid and written by a hacker. I think you can tell when you get to the page with the venn diagram of biscuits.