Unfortunately, it's not that simple.
There are many odd people out there, aswell as some viruses, that scan ISP's, IP's and various networks for open ports, and possible backdoors into systems.
If you installed a REAL firewall program and watched the LOG of blocked connection attempts, you will quickly learn that you are getting atleast 100-200 attempts per day. ( Especially when using broadband.)
And like I said, this includes viruses that users don't know are on their systems. These programs automatically scan for vunerable systems and this is where the majority of blocked connection attempts come from.
With norton, you can scan the IP address of the 'attacker' and get an image of where the attack came from. ( A world map image, then zooms to location when it's found... )
And I've had attempts from all around the world, Korea, China, Germany, South America... etc...
There's millions of computers out there that are infected and scanning the internet for vunerable systems...
It's not just 'attachments' , which are actually taken care of by 'Virus Scanners' not Firewalls.
