Request: Gateway Software

Does someone have a FREE linux ‘total’ solution available for
creating a ‘login’ page for wireless systems connecting to a network?

I’ve a Linux system with 2 network cards, they are both different configured and I need a way that when a wireless client is connected the client automatically gets the page where it’s welcomed and has to enter a username/password. After validation: total control of the network /internet

Psst. No-Cat did not work here ..

HELP!