I setting up a LAN in our new office. On our new LAN, we need to deploy a public wireless network without a password or authentication for use in a conference room. (so clients can come in with a laptop and connect hassel free). Because the wireless access point would be connected directly to our LAN, it would leave us exposed. I will be purchasing a router to connect to our cable internet connection. Can I configure the router so that the port for the conference room is more restrictive (only allows email and web surfing)? Or do I need to purchase another firewall device to stick in between our LAN and the wireless access point?