Trying to get a grip on port forwarding
November 21, 2006 1:37 PM Subscribe
Computer question: How is it possible for my computer and various p2p/network game apps to communicate with the Internet when it's obvious that all my ports are closed?
posted by zek to computers & internet (7 answers total)
Basically I spent this morning trying to get a p2p client working. It said I was firewalled. I ran port tests for the client and the general port tests on whatsmyip.org, and they said that no ports were open and they were refusing packets. It was only when I went into my router that I discovered that no port forwarding was enabled... I set this up and now everything works.
Therefore why is it that some p2p and network games DO run, even with a fouled up port setup? I've been able to run Shareaza, a few network games, and other stuff, and even service outgoing files with inoperative ports. I considered that as evidence that maybe the ports were working, though obviously I was wrong. So how is it these programs were able to run?
Heck, how does http and smtp traffic get out when the modem and router are blocking all the ports? And if web & email use a tiny subset of "open ports", why don't trojans use these ports to do their dirty work? Or are those ports invincible?