In HA mode, all the IPAM Appliances (2 or more) act as masters or primary appliances. The DNS/DHCP appliances can connect to any one of them. Generally, they will be connected to the closest IPAM Appliance (geographically or round-trip message flow time). The clients or users can connect to any of the IPAM appliances and perform the administrative tasks. The databases in all the appliances form a cluster and are in active-active setup, thus causing them to be in in sync all the time. When one IPAM appliance goes down, the remotes connected to that appliance will re-connect to the other active IPAM appliance without interrupting the service.