Chapter 14 Using DHCP Dynamic host address management

Dynamic Host Configuration Protocol (DHCP, Dynamic Host Configuration Protocol) , a UDP based protocol and the network protocol used only within the LAN, the protocol for the automatic management of the LAN IP address of the host, the subnet mask, gateway address DNS address and other parameters, mainly used for large-scale LAN environment or there is a LAN environment are more mobile office device. In simple terms, DHCP protocol is to allow hosts on the LAN to automatically obtain network parameters.

Common terms DHCP involved:
1. Scope: a full range of IP addresses, DHCP protocol according to the distribution of network management scope to assign IP addresses and other configuration parameters.
2, Superscope: means for managing a plurality of logical sub-segments in the same physical network. Super scope contains a list of scopes can be unified management.
3, exclude scope: the scope of certain IP addresses to exclude, to ensure that these IP addresses are not assigned to a DHCP client.
4, an address pool: After defining the scope and application of the DHCP exclusion ranges for the remaining range of the dynamic IP address assigned to the DHCP client.
5, the lease: DHCP client can use the time of the IP address dynamically assigned.
6, the reservation: to ensure a particular network device is always the same IP address acquired.
dhcpd is the Linux system for providing DHCP protocol service program.

In the Linux system or a Windows system, you can learn by looking at the MAC address of the host network card status. Dhcpd configuration file service program in accordance with the following format IP address and MAC address binding.
Configuration parameters Format:
Host Host Name {
Hardware the MAC Ethernet address of the host;
Fixed-address to be assigned an IP address;
}
Course Notes below