网络结构拓扑图:DHCP server下载地址:ftp:/195.220.108.108/linux/fedora/releases/8/Everything/i386/os/Packages/dhcp-3.0.6-10.fc8.i386.rpm第一步:rpm qa | grep dhcp /查看DHCP是否安装第二步:rpm ivh dhcp-3.0.1-12_EL.i386.rpm /安装DHCP的软件包第三步:cp /usr/share/doc/dhcp-3.0.1/dhcp.conf.sample /etc/dhcpd.conf /把样例文件复制到/etc/dhcpd.conf第四步:vi /etc/dhcpd.conf /修改配置文件ddns-update-style interim; #定义所支持的DNS动态更新类型（必选）ignore client-updates; #忽略客户机更新DNS记录allow bootp;#配置192.168.1.0网段 subnet 192.168.1.0 netmask 255.255.255.0 #定义作用域（IP子网） option routers 192.168.1.254; #为客户端指定网关 option subnet-mask 255.255.255.0; #为客户端指定子网掩码 option domain-name “dpgroup.net”; #为客户端指定DNS域名 option domain-name-servers 61.187.98.3; #为客户端指定DNS服务器的IP地址 range dynamic-bootp 192.168.1.2 192.168.1.253; #定义作用域（IP子网）范围 default-lease-time 21600; #指定默认的租约期限一天是86400秒 max-lease-time 43200; #指定最大租约期限 host dc1 #配置192.168.1.0网段某台机保留地址 next-server marvin.redhat.com hardware Ethernet 00:0C:29:94:07:72; #客户机的网卡物理地址 fixed-address 192.168.1.100; #分配给客户机的一个固定IP地址 option routers 192.168.1.254; #为客户端指定网关 #配置192.168.2.0网段 subnet 192.168.2.0 netmask 255.255.255.0 option routers 192.168.2.254; option subnet-mask 255.255.255.0; option domain-name-servers 61.187.98.3; range dynamic-bootp 192.168.2.2 192.168.2.253; default-lease-time 21600; max-lease-time 43200; #配置192.168.3.0网段 subnet 192.168.3.0 netmask 255.255.255.0 option routers 192.168.3.254; option subnet-mask 255.255.255.0; option domain-name-servers 61.187.98.3; range dynamic-bootp 192.168.3.2 192.168.3.253; default-lease-time 21600; max-lease-time 43200; 第五步:DHCP服务器设置 service dhcpd start /启动dhcpd 服务route add default gw 192.168.1.254 /网关指向DHCP 中继 进入ntsysv找到dhcpd,在前面打上*号即可 /开机自动启动第六步:DHCP中继服务器设置ifconfig eth0 192.168.1.254 up / 配置eth0的IP地址ifconfig eth1 192.168.2.254 up / 配置eth1的IP地址ifconfig eth2 192.168.3.254 up /配置eth2的IP地址echo 1 /proc/sys/net/ipv4/ip_forward /开启路由iptables F /刷新放火墙dhcrelay 192.168.1.1 /DHCP请求包发往DHCP服务器第七步:测试在windows客户机上用以下命令检查：ipconfig /release /释放租约ipconfig /renew /重新获取vi /etc/servicesbootps 67/tcp bootps 67/udp 是DHCP的服务端口