"Why should it be impossible to print from some machine, just because it has a globally routable address?" Because it's an Internet. Sure, it's uncommon behav

"Why should it be impossible to print from some machine, just because it has a globally routable address?" Because it's an Internet. Sure, it's uncommon behavior and not what most people want, but let's not completely give up on the notion of being a peer on the network. The printer serves up (printing) just like a web server serves up web pages. You should be able to run a web server and participate as a peer, globally.