Linux AS4下配置DHCP 操作系统:Red Hat Enterprise Linux AS release 4 (Nahant Update 3)2.6.9-34.EL
RedHat使用dhcpd进程提供DHCP服务，启动时dhcpd自动读它的配置文件/etc/dhcpd.conf。dhcpd将客户的租用信息保存
在/var/lib/dhcp/dhcpd.leases文件中，该文件不断被更新，从这里面可以查到IP地址分配的情况。
配置实例:
# rpm -qa | grep dhcp
dhcp-3.0pl1-23
# ls /etc/dhcpd.conf
# find /usr/share/doc -name dhcp*.*
/usr/share/doc/dhcp-3.0pl1
/usr/share/doc/dhcp-3.0pl1/dhcpd.conf.sample
# cp /usr/share/doc/dhcp-3.0pl1/dhcpd.conf.sample /etc/dhcpd.conf
# vi /etc/dhcpd.conf ----------编辑dhcpd.conf文件
ddns-update-style interim; #定义所支持的DNS动态更新的型{none|adhoc|interim}
ignore client-updates; #allow/ignore允许/忽略客户机更新DNS记录
subnet 192.168.0.0 netmask 255.255.255.0{
#定义dhcp服务的子网
default-lease-time 21600;
#默认的租约时间,单位为秒
max-lease-time 518400;
#最长时间518400秒
option domain-name-servers 192.168.0.5;
#定义dns地址
option routers 192.168.0.1;
#定义默认路由
range dynamic-bootp 192.168.0.10 192.168.0.253;
#定义给客户端分配的IP地址范围
option subnet-mask 255.255.255.0;
#定义分配的子网掩码
option broadcast-address 192.168.0.255;
#定义广播地址
host ns {
next-server marvin.redhat.com;
hardware ethernet 00:0C:29:BE:63:32;
fixed-address 192.168.0.100;
option broadcast-address 192.168.0.255;
option routers 192.168.0.3;
} #静态IP地址分配,mac地址为63:32的网卡分配192.168.0.100这个地址
[root@apple ~]# /etc/rc.d/init.d/dhcpd start
#启动dhcp服务,配置完比,可去客户端做测试
获取IP:在另外一个redhat linux上，把IP设置成DHCP主机的IP地址。
检查配置：
[root@rh root]# cat /etc/sysconfig/ network-scripts/ifcfg-eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp
[root@rh root]# dhclient eth0 ----从服务器上去获取IP