When someone connects to my network and tries to browse, I would like to redirected to a welcome page. I know there are some commercial solutions for hotspots out there, what I am looking for is just redirecting. Ideally, I could set this network rule from the command line, not through the network admin GUI. Can you guide me with some keyworks or tutorials I should follow to do this?
EDIT: The network is a WLAN like in a hotel. Ideally was looking for a router-independent solution, but advice on a Netgear Aircard, for instance, would be enough.