I'm using a wireless router with a built in firewall (Motorla 850g). The firewall passes ALL the comprehensive tests through Sygate, Shield Up!, and so forth. One PC is hooked via Ethernet line and the only other PC is wireless via wireless card. I see no reason to add a software firewall if the router firewall is passing tests. I've tried using the Sygate free firewall in addition and I get moot messages like Windows XP using the multicast IP 239.255.255.250 and so forth. Based on my own limited research on the subject I'm not finding a whole lot of information that suggests that using two firewalls, one hard and one soft, is a must for security. But I would like to get a consensus on the subject.