1. Indeed your Belkin router does have an internal NAT firewall which will at least block anybody from uploading from you. You can overcome this by opening port 6346 within it. This is called port forwarding. Can you tell us the model number of the Belkin?

2. Can you tell us which operating system you use? (eg: Windows 98, if XP does it have SP1 or SP2?)

3. Can you tell us which firewalls you have?