Siemens S323, S223 Dynamic Host Configuration Protocol Dhcp, Saving Cost, Efficient IP Management

UMN:CLI	User Manual
	SURPASS hiD 6615 S223/S323 R1.5

8.8Dynamic Host Configuration Protocol (DHCP)

Dynamic host configuration protocol (DHCP) is a TCP/IP standard for simplifying the ad- ministrative management of IP address configuration by automating address configura- tion for network clients. The DHCP standard provides for the use of DHCP servers as a way to manage dynamic allocation of IP addresses and other related configuration details to DHCP-enabled clients on the network.

Every device on a TCP/IP network must have a unique IP address in order to access the network and its resources. The IP address (together with its related subnet mask) identi- fies both the host computer and the subnet to which it is attached. When you move a computer to a different subnet, the IP address must be changed. DHCP allows you to dy- namically assign an IP address to a client from a DHCP server IP address database on the local network.

The DHCP provides the following benefits:

Saving Cost

Numerous users can access the IP network with a small amount of IP resources in the environment that most users do not have to access the IP network at the same time all day long. This allows the network administrators to save the cost and IP resources.

Efficient IP Management

By deploying DHCP in a network, this entire process is automated and centrally managed. The DHCP server maintains a pool of IP addresses and leases an address to any DHCP- enabled client when it logs on to the network. Because the IP addresses are dynamic (leased) rather than static (permanently assigned), addresses no longer in use are auto- matically returned to the pool for reallocation.

IP Packet
(Broadcast)	DHCP Server or Relay Agent

DHCP Packet

(Unicast)

Subnet

※PC=DHCP Client

Fig. 8.31 DHCP Service Structure

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