I work for a Conference Center and we are rebuilding the network for our guests to use. I am funtionally a highschool intern with relativly little networking experience but I have so far put in a new router to replace our old one and put new AP's around the building. All the equipment is /24 or Class C (not by choice) and my new concern is that we will have far more than 256 guest devices on this router. So I have been looking into VLAN thinking that maybe I can branch off half the devices into a different subnet so that I could have 512 devices between 192.168.1.* and 192.168.2.* I am using a Cisco 4 port Gigabit RVS4000 and so far it seems I can't do that (hopefully I'm wrong) So then I thought maybe I could reconnect the old, still perfectly functional router as a redundant system on 192.168.2.1 and set that DHCP to grap the X.X.2.* range, but I'm concerned that would either mess up our seamless roaming or not connect properly to the AP's that are still on X.X.1.(2-6) (although I would like to be paid to come in and change their IP's every time we needed to use the overflow system I don't think my boss would appreciate the extra work) I also think there should be a better way than two whole routers.
So is there anything I'm missing or should I just keep plugging about with parellel routers?
EDIT: Router only supports 255.255.255.* which is horrid http://i.imgur.com/icXBd.png