一、 实验配置：
DHCP服务器的配置：
1、检查是否安装软件包
[root@localhost ~]# rpm -qa dhcp
[root@localhost ~]#
2、挂载RHEL企4DVD光盘，并安装DHCP包
[root@localhost ~]# mount /dev/cdrom /media/cdrom/
mount: block device /dev/cdrom is write-protected, mounting read-only
[root@localhost ~]# cd /media/cdrom/RedHat/RPMS/
[root@localhostRPMS]#rpm –ivh dhcp-3.0.1-12_EL.i386.rpm dhcp-devel-3.0.1-12_EL.i386.rpm
warning: dhcp-3.0.1-12_EL.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e
Preparing... ########################################### [100%]
1:dhcp ########################################### [ 50%]
2:dhcp-devel ########################################### [100%]
3、复制DHCP配置文件到/etc/目录下
[root@localhostRPMS]#cp/usr/share/doc/dhcp-3.0.1/dhcpd.conf.sample /etc/dhcpd.conf
[root@localhost RPMS]#
4、修改dhcpd.conf主配置文件
[root@localhost RPMS]# vi /etc/dhcpd.conf
ddns-update-style interim; ====》 全局设置，全局生效
option nis-domain "sanjianke.com"; ==》 与nis相关的设置
option domain-name "sanjianke.com"; ==》 dns服务器的域名
option domain-name-servers 202.106.0.20; ==》dns 服务器的ip(会修改/etc/resolv.conf)
subnet 192.168.10.0 netmask 255.255.255.0 { ==》局部网段设置，局部生效
option routers 192.168.10.1; ===》分配的网关
option subnet-mask 255.255.255.0; ==》标准的掩码
range dynamic-bootp 192.168.10.50 192.168.10.200; ==》所分配的地址池
default-lease-time 21600; ==》默认的租约期限
max-lease-time 43200; ==》最大租约期限
host ns {
hardware ethernet 12:34:56:78:AB:CD; ==》客户端网卡
fixed-address 192.168.10.88; ====》所分配的固定的ip
}
}
subnet 192.168.20.0 netmask 255.255.255.0{ ==》分配的不同的网段
option routers 192.168.20.1； ===》局部网关
option subnet-mask 255.255.255.0; ===》局部掩码
range dynamic-bootp 192.168.20.50 192.168.20.200; ===》局部地址池
}