Quote Originally Posted by user0182
i was also wondering, is there a convention from marking auto-sensing ports, or is it just a matter of reading the documentation?
RTFM works for me

i was also wondering; when one has a router that is connected to the Internet, how does that router know where to route packets that are not addressed to IP addresses on one's LAN?
The (static) routing table defines were to route things. Try (on windows or *nix) netstat -rn.

There can be some dynamic routing too. Things like RIP, OSPF and BGP.