首先需要安装DHCP服务
[root@localhost Server]# rpm -ivh dhcp-3.0.5-31.el5_8.1.x86_64.rpm

将其设为开机启动
[root@localhost etc]# chkconfig dhcpd on
[root@localhost etc]# chkconfig --list dhcpd
dhcpd           0:关闭  1:关闭  2:启用  3:启用  4:启用  5:启用  6:关闭

配置文件
[root@localhost etc]# vim dhcpd.conf 
ddns-update-style interim;                            动态更新类型，必须有
subnet 192.168.1.0 netmask 255.255.255.0 {            声明网段
        option routers                  192.168.1.254;默认网关
        option subnet-mask              255.255.255.0;子网掩码
        option domain-name              "tarena.com";
        option domain-name-servers      202.106.0.20,192.168.1.254;    DNS服务器
        range dynamic-bootp 192.168.1.20 192.168.1.50;         IP分配范围  
        range dynamic-bootp 192.168.1.80 192.168.1.100;
        default-lease-time 21600;                          默认租约期                 
        max-lease-time 43200;                              最大租约期
        host win7 {                                  
                hardware ethernet 00:0C:29:1D:0B:0C;为主机分配固定IP，只能用在host声明
                fixed-address 192.168.1.88;         指定主机物理地址，只能用在host声明
        }
        host linux {
                hardware ethernet 00:0C:29:C7:BB:E6;
                fixed-address 192.168.1.66;
        }
}

测试dhcp服务器
[root@localhost ~]# service dhcpd configtest
Syntax: OK

重启服务
[root@localhost ~]# service dhcpd restart

将客户端设为自动获取IP地址
[root@localhost ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0
BOOTPROTO=dhcp

重启客户端network,查看IP
[root@localhost ~]# service network restart
[root@localhost ~]# ifconfig

查看服务器IP分配情况（在服务器）
[root@localhost ~]# less /var/lib/dhcpd/dhcpd.leases

查看客户端已获取的IP租约
[root@localhost ~]# less /var/lib/dhclient/dhclient.leases 
或
[root@localhost ~]# less /var/lib/dhclient/dhclient-eth0.leases

注：服务器本身必须有IP地址，IP分配范围必须在声明网段内