I have 2 4400 controllers. Each is located at a different site and the access points at each site will have a primary and secondary controller. Each site is on a different subnet. When the link between the sites fails then each site works fine as a standalone. However, if one controler fails then I am trying to understand what will happen to the clients. The APs will come up on the failover controller which is now in a different subnet. How can I get the clients on the "primary" subnet to get the correct IP subnet address when they are connected to the secondary controller? I know H-REAP offers some solutions but if there is delay in response most users will reboot their clients and then not be able to authenticate. Am I correct in assuming that failover controllers only work if both controllers are on the same subnet?