DHCP relay
A DHCP relay enables centralized IP address management by forwarding DHCP requests between clients and servers across different subnets, ensuring seamless network configuration and scalability.
DHCP relay is a network function that forwards DHCP messages between clients and servers when they reside on different subnets. This allows organizations to manage IP address allocation from a central DHCP server, simplifying network administration and reducing the need for multiple servers on each subnet.
Relay agents, typically configured on routers or Layer 3 switches, intercept DHCP client broadcasts and forward them as unicast messages to designated servers. They may also insert additional information, such as relay agent options, to help servers assign appropriate network settings.
DHCP relay improves scalability, reduces broadcast traffic, and enables efficient IP address management in complex or growing network environments. Proper configuration and testing are essential to ensure reliable operation and avoid misrouted requests.
Alternatives include deploying local DHCP servers on each subnet, but this increases administrative overhead and complexity.