Dynamic Host Configuration Protocol (DHCP, Dynamic Host Configuration Protocol), the protocol parameters for the IP address, subnet mask, gateway address and DNS address automatically manages the host LAN, can effectively improve the utilization of the IP address, to improve allocative efficiency, and reduce administrative and maintenance costs.
Dynamic Host Configuration Protocol (DHCP) is a protocol based on the UDP and the network protocol used only within the LAN, the LAN environment mainly for large or there are more mobile office LAN environment devices, its main purpose is for the internal LAN equipment or network provider automatically assigns IP address and other parameters.
dhcpd is the Linux system for providing DHCP protocol service program.
Some concepts:
Scope: A complete range of IP addresses, DHCP protocol in accordance with the scope to manage the distribution network, assign IP addresses and other configuration parameters.
Superscope: for managing a plurality of logical sub-segments in the same physical network. Super scope contains a list of scopes can be unified management.
Exclusion ranges: the scope of certain IP addresses to exclude, to ensure that these IP addresses are not assigned to a DHCP client.
Address pool: After defining DHCP scope and range of application of the exclusion, the remaining range to dynamically assigns IP addresses to the DHCP client.
Lease: DHCP client can use the IP address of the time allocated dynamically.
Reservation: to ensure a particular network device is always the same IP address acquired.
The dhcp service allows clients to automatically obtain the IP address of the
DHCP protocol in order to more efficiently concentrate resources in the IP address of the management LAN.
The DHCP server automatically assigns IP information network address, subnet mask, gateway, DNS address to needy clients, and the client when the lease expiration time may also be recovered automatically assigned an IP address, to give new customers added end.
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