查询DHCP服务包  
 #rpm -qa |grep dhcp
装      rpm -ivh   包名称  dhcp-3.0pll-23.i386.rpm
更新  rpm -Uvh  包名称   dhcp-3.0pll-23.i386.rpm
DHCPD 服务名 凡是服务名的名称一般都是以D结尾 
主配置文件/etc/dhcpd.conf  默认是为空
cp 将/usr/share/doc/dhcp-3.0pll/dhcpd.conf .sample 拷贝到/etc/dhcpd.conf
修改配置文件/etc/dhcpd.conf

subnet 192.168.0.0 netmask 255.255.255.0 {  网络范围
# --- default gateway
        option routers                  192.168.0.1;  网关
        option subnet-mask              255.255.255.0;  掩码
         option domain-name              "dos.com";     域名
        option domain-name-servers      192.168.1.1; dns
        option time-offset        -18000; # Eastern Standard Time 地址偏移时间
#       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 192.168.0.128 192.168.0.255; 地址池
        default-lease-time 21600;  租约时间按秒算
        max-lease-time 43200;  最大租期
        # we want the nameserver to appear at a fixed address
        host ns {
                next-server marvin.redhat.com;
                hardware ethernet 12:34:56:78:AB:CD;
                fixed-address 207.175.42.254;
        }
 
vi /etc/sysconfig/dhcpd  指定网卡
DHCPDARGS=eth0
创建客户租期数据库
touch  /var/lib/dhcp/dhcp.leases
重启服务  service dhcpd restart
                                     start  启动
客户端先自动获取IP netconfig  空格[*]   OK
重启    service network restart
dhclient 客户端获取地址