D-Link DFL-2500 User Guide - Page 294
DHCP Server & Relayer
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26 CHAPTER DHCP Server & Relayer 26.1 DHCP Server The DHCP server implement the task to assign and manage IP addresses from specified address pools to DHCP clients. When a DHCP server receives a request from a DHCP client, it returns the configuration parameters (such as an IP address, a MAC address, a domain name, and a lease for the IP address) to the client in a unicast message. Because the DHCP server maintains configurations for several subnets, an administrator only needs to update a single, central server when configuration parameters change. Compared to the static assignment where the client owns the address, dynamic addressing by the DHCP server leases the address to each client for a pre-defined period of time. During the life cycle of the lease, the client has permission to keep the assigned address and is guaranteed to have no address collision with other clients. Before the expiration of the lease, the client needs to renew the lease from the server, so it can keep using its IP address. The client may also decide at any time that it no longer wishes to use the IP address it was assigned, and may terminate the lease by releasing the IP address. The lease time can be configured in the DHCP server by the administrator. 275
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