Siemens S223 - Manual (Page 238)

UMN:CLI User Manual
SURPASS hiD 6615 S223/S323 R1.5
238 A50010-Y3-C150-2-7619
8.8 Dynamic 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.
DHCP Server or Relay Agent
DHCP Packet
(Unicast)
IP Packet
(Broadcast)
※ PC=DHCP Client
Subnet
Fig. 8.31 DHCP Service Structure