Build DHCP server on Linux

DHCP Server build

Environment

redhat.enterprise.linux.5.8

Dhcp-3.0.5-31.el5

Content:

Introduction to DHCP Services

DHCP service configuration file

DHCP service case

1. Introduction to DHCP Service

How DHCP works: The client transmits broadcast packets to all the main clauses within the entire physical network segment, such as when there is a DHCP server in the LAN, which responds to the client's IP parameter requirements, so the DHCP server and client should be in the same physical network segment. DHCP: Network protocol for Dynamic Host configuration

The process of connecting the client to the DHCP server is as follows, figure A

1, Client: Use broadcast packet to send search DNCP server package

2, server-side: Provide client network-related lease selection

3, client: Determine the choice of DHCP server network parameters provided by the lease and report to the service

Service device

4, server side: Record this lease and return to the client related packet information

2, DHCP configuration file detailed

IP parameters given to clients by the DHCP server: fixed and dynamic

Static IP: The use of recording the client's network card information and IP binding to achieve each IP is the same.

Dynamic IP: Each time from the IP pool has not been used randomly select an IP address assigned to the client.

DHCP Software: Yum install DHCP

DHCP data files

/ETC/DHCPD.CONF:DHCP's main configuration file

/ETC/SYSCONFIG/DHCPD:D HCP's NIC settings file, multiple network adapters set up to provide DHCP service via that NIC

/ETC/SYSCONFIG/DHCRELAY:DHCP Relay configuration file

/var/lib/dhcpd/dhcpd.leases: Documents that log information such as leases after a client connects

Primary configuration file for DHCP: etc/dhcpd.conf

After software installation, the default is not to provide configuration files, but for us to provide a configuration sample document, copy over to install

Cp/usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample/etc/dhcpd.conf