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Originally Posted by DeShon
But is it safe to set up router for port forwarding or does that open my computer up for every hacker out there?
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As I understand it... it depends.
Some routers simply open up the specified port (say, 49180) to all computers on the LAN. Some routers allow the port to be opened when requested by a specific application that you specify (say, Azureus). (Network guys, somebody explain to me how app name data is passed thru via IP). Some routers allow you to open a port (say, 49180) only to one computer in your LAN (computer is identified by IP address.)
Those are just the cases I've seen; there may be others.
Probably need to allow permission in your Windows Firewall settings (or other firewall) for Azureus.
I'm sure no one is safe, but if you stack it up, there are layers of protection:
Windows firewall (or other brand X, zonealarm, etc)
NAT being done on your router (look it up in Wikipedia)
Hardware firewall on your router
And, your ISP likely employs measures to keep their networks passably secure (from your public IP out to their border router (to internet)).
This is anecdotal, but most of the infections/rootkits/worms/bots attacks I've personally seen have been enabled by the user, not an attack over the Internet. People will download a questionable file, or run a pirated program, or install (stolen?) software from questionable sources. If a user is actively opening files and installing software from somewhere shady, that's usually where the problem comes from.
Doubtless someone shall be along to correct me, I just dabble. YMMV.