I have a WLC 4404, Cisco 4506 core, 3560G edge switches, and cisco 1142 AP. I have a single SSID and have created two AP groups. One for each building. Each AP group is part of its own separate VLAN.
My goal is to split up my network to shrink my broadcast domain. If you are in building A, then I want you to be in AP group A and which means you have the subnet/ip info of VLAN A. If you decide to close your laptop down, walk across campus to building B, then I want you to be part of AP group B and have your subnet/IP info match that of VLAN B.
The problem I am having is when a user connects to AP group A, and they move over to the other building which puts them on AP group B, they keep the same IP address as AP group A. This is a problem because I have certain projectors that use broadcasts to announce themselves. So if you are not a part of that broadcast domain, you cannot connect wirelessly to the projectors.
I have tried no ip proxy-arp on both VLAN interfaces and I have disabled DHCP Proxy on the WLC but the same results. Again I am not having any problems with things working fine with email/internet/servers, no matter which AP group you are in. But I want your IP address to come from which AP group you are connected too aka which building you are in.
Any thoughts on how to do this?