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DHCP Failover
Port 647 is officially designated for the DHCP Failover protocol, which enables communication between primary and secondary DHCP servers to maintain IP address allocation consistency and high availability. By synchronizing lease information, this protocol plays a crucial role in ensuring continuous network connectivity and minimizing IP conflicts during server outages..
Overview: The DHCP Failover Protocol, operating on port 647, allows two DHCP servers to work in tandem, maintaining consistent lease databases and providing fault tolerance within enterprise networks. The protocol facilitates real-time communication between active and standby servers to ensure seamless IP address management.
Mechanism: This protocol uses a TCP-based connection to guarantee reliable state synchronization between partnering servers. During normal operation, lease allocations, renewals, and expirations are continuously exchanged, ensuring both servers have up-to-date information. If one server fails, the partner can continue issuing leases without client disruption.
Deployment Considerations: DHCP failover configurations support various modes like 'load balance' and 'hot standby' for different redundancy needs. Proper configuration ensures minimal recovery times and consistent client experiences during network issues or planned maintenance windows.