I have a Linksys Router/Firewall. How can some packets get through if they aren't in response to a request. What value does the firewall function have? It may keep the amateurs out but isn't it the pros we really need to fear? When I do an online port scan the sites always see my real IP and ask me if this is correct. I thought that the NAT (or whatever) function of the router kept me hidden and broadcasted only the routers IP or some proxy type of address. Finally some scanning programs seem to find a few open ports even with routers firewall and Zone Alarm running. One more thing why do so many ports seem open or at least listening....it just seems to be a loosing battle!!! Sorry for all of the questions.