环境说明：
DHCP服务器系统：CentOS 5.5
网卡接口：eth0
IP地址：192.168.21.136
网关：192.168.21.2
子网掩码：255.255.255.0
DNS：8.8.8.8 8.8.4.4
一、安装
检查DHCP服务是否安装
rpm -q dhcp
package dhcp is not installed
yum -y install dhcp
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二、配置
cp /usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf #复制配置文件模板
vi /etc/dhcpd.conf #编辑配置文件
ddns-update-style interim; #设置DHCP服务器模式
ignore client-updates; #禁止客户端更新
subnet 192.168.21.0 netmask 255.255.255.0 {
option routers 192.168.21.2; #设置网关
option subnet-mask 255.255.255.0; #设置子网掩码
option domain-name-servers 8.8.8.8,8.8.4.4; #设置dns服务器地址
range dynamic-bootp 192.168.21.200 192.168.21.210; #设置dhcp服务器IP地址租用的范围
default-lease-time 21600; #默认租约时间
max-lease-time 43200; #最大租约时间
hardware ethernet 00:0C:29:E2:82:5C; #保留主机的MAC地址
fixed-address 192.168.21.201; #保留主机的IP，即绑定IP地址到主机
vi /etc/sysconfig/dhcpd #指定DHCP服务的网络接口
# Command line options here
DHCPDARGS=eth0
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三、启动
service dhcpd start #启动dhcp服务
service dhcpd restart #重启dhcp服务
chkconfig dhcpd on #设置开机启动
四、测试
在客户机上设置IP地址为自动获得，重启客户机，查看IP地址为192.168.21.200到192.168.21.210其中的一个，即为成功！
附件：本教程中的dhcpd.conf配置文件
ddns-update-style interim;
ignore client-updates;
subnet 192.168.21.0 netmask 255.255.255.0 {
# --- default gateway
option routers 192.168.21.2;
option subnet-mask 255.255.255.0;
# option nis-domain "domain.org";
# option domain-name "domain.org";
option domain-name-servers 8.8.8.8,8.8.4.4;
option time-offset -18000; # Eastern Standard Time
# option ntp-servers 192.168.1.1;
# option netbios-name-servers 192.168.1.1;
# --- Selects point-to-point node (default is hybrid). Don't change this unless
# -- you understand Netbios very well
# option netbios-node-type 2;
range dynamic-bootp 192.168.21.200 192.168.21.210;
default-lease-time 21600;
max-lease-time 43200;
# we want the nameserver to appear at a fixed address
host ns {
next-server marvin.redhat.com;
hardware ethernet 00:0C:29:E2:82:5C;
fixed-address 192.168.21.201;
}
}
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