TCPWave's IPAM provides a sophisticated "High Availability" (HA) feature to provide a stable service to it's large enterprise customers. The HA environment can be setup using three or more IPAM appliances located in different geographical locations. All the DNS and DHCP appliances in the enterprise can be managed from any of the IPAM, irrespective of their physical locations. The administrators can connect to any of the IPAM appliances for the day-to-day operations. The IPAM appliances form a cluster of IPAMs and are always in sync with other IPAMs; i.e. the IPAM appliances form an active-active setup. The changes done on one IPAM are reflected towards other IPAMs instantaneously. If an IPAM appliance goes down for any reason, the DNS or DHCP appliances that are connected to it, for management purposes, automatically get connected to the other IPAM appliances in the environment. This switch over is always transparent to the user.