I have never understood this very well, here is my current grasp of it..
If I open up port 110 on my router:
- If hacker is probing random IP addresses on that port, I will be flagged as open and he will come back and pay me a visit.
- Any Trojans, viruses, or other malware that works its way into PCs via port 110 will eventually stumble across my open port and infect me.
Alternatively, if I "forward" port 110 to say 192.168.0.5 (my pop3 server PC):
- If hacker is probing random IP addresses on that port, will I will be flagged as closed? stealthed? worth a second visit?
- Any Trojans, viruses or other port 110 malware will squirm through my router and arrive at 192.168.0.5??
Please can someone clear this up for me.