Well. You say you plugged the linksys directly into port 1. To do that you had to unplug your working network. You need to use a layer 3 switch, vlans configured and trunked for each network. Make sure you have the management interface and any dynamic interfaces for the SSIDs configured with appropriate addresses for each interface (interface, gateway, and dhcp scope for each network) in place. If you still can not get an address from the linksys then you will need to turn off the dhcp proxy on the controller. From the cli it is "config dhcp proxy disable" I think. This will allow client to go straight to the linksys for dhcp and not use the virtual interface for proxy. If this doesn't make sense look at the configuration guide for a 2106 as the code is basically the same for the 526 and much better documented.