Dhcp Servers - D-Link DES-3326SRM - Switch - Stackable Product Manual

D-Link DES-3326S Layer 3 Switch

DHCP Servers

The Dynamic Host Configuration Protocol (DHCP) is used to dynamically assign a TCP/IP network configuration to
network devices and computers on the network. It also ensures that IP address conflicts do not occur.
IP addresses are assigned from a pool of free addresses. Each IP address assigned has a 'lease' and a 'lease expiration
period'. The lease must be periodically renewed. If the lease is expires, the IP address is returned to the pool of available IP
addresses.
Usually, it is a network policy to assign the same IP address to a given network device or computer each time.
If the IP address lease expires, the network device sends a message to the DHCP server requesting a lease renewal. The
DHCP server can send an acknowledgement containing a new lease and updated configuration information.
If an IP address lease cannot be renewed, the network device or computer sends a request to all local DHCP servers
attempting to renew the lease. If the DHCP returns a negative acknowledgement, the network device must release its TCP/IP
configuration and reinitialize.
When a new TCP/IP configuration is received from a DHCP server, the network device checks for a possible IP address
conflict by sending an Address Resolution Protocol (ARP) request that contains its new IP address.
For two DHCP servers to communicate across different subnets, the BOOTP/DHCP Relay of the DES-3326S must be used.
The DHCP servers are identified by IP addresses.
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