3Com E4500-24, Руководство по настройке CLI, Страница: 429 / 848

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DHCP Server Configuration
When configuring the DHCP server, go to these sections for information you are interested in:
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Introduction to DHCP Server
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DHCP Server Configuration Task List
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Enabling DHCP
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Configuring the Global Address Pool Based DHCP Server
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Configuring the Interface Address Pool Based DHCP Server
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Configuring DHCP Server Security Functions
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Configuring DHCP Accounting Functions
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Enabling the DHCP Server to Process Option 82
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Displaying and Maintaining the DHCP Server
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DHCP Server Configuration Examples
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Troubleshooting a DHCP Server
Currently, the interface-related DHCP server configurations can only be made on VLAN interfaces.
Introduction to DHCP Server
Usage of DHCP Server
Generally, DHCP servers are used in the following networks to assign IP addresses:
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Large-sized networks, where manual configuration method bears heavy load and is difficult to
manage the whole network in centralized way.
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Networks where the number of available IP addresses is less than that of the hosts. In this type of
networks, IP addresses are not enough for all the hosts to obtain a fixed IP address, and the
number of on-line users is limited (such is the case in an ISP network). In these networks, a great
number of hosts must dynamically obtain IP addresses through DHCP.
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Networks where only a few hosts need fixed IP addresses and most hosts do not need fixed IP
addresses.
DHCP Address Pool
A DHCP address pool holds the IP addresses to be assigned to DHCP clients. When a DHCP server
receives a DHCP request from a DHCP client, it selects an address pool depending on the configuration,
picks an IP address from the pool and sends the IP address and other related parameters (such as the
IP address of the DNS server, and the lease time of the IP address) to the DHCP client.