I'm exploring Windows 7 firewall capabilities. I have a machine purposed for business only, no web surfing. I want to block all ip addresses and allow only the few needed for business. I thought I'd block all ip addresses and then enter rules to except the ip addresses on my whitlelist. Just the first step is tricky because the wizard won't accept some ip addresses as valid. Beyond that I'm not sure how an exception would be entered to the firewall.