Hello,

You can use a Linksys router for your hotspot. I recommend the Wrt54gl. You should use it as your gateway in order to authenticate all connections, and to prevent bypassing of the hotspot. By default its LAN ports will redirect to the splash page, so you can route all traffic through it LAN ports.

You can find the instalaltion guide here: http://hotspotsystem.com/en/hotspot/install_guide_dd-wrt.html