Linux server 下启用DHCP中继代理

实验平台:

两台LINUX,一台做,一台做dhcprelay中继代理服务器,三台用于测试的PC,网线若干;

实验要求:

分配三个网段:           

                       192.168.5.0/24

                        192.168.6.0/24

                        192.168.7.0/24

其中DHCP中继代理服务器的三个网卡分别为:eth0;eth1;eth2

eth0:192.168.5.1

eth1:192.168.6.1

eth2:192.168.7.1

DHCP服务器的网卡为:eth0

eth0:192.168.5.2

要求用于测试的PC1,PC2,PC3分别挂在三个网段中,最后实验的结果为,三个PC均获得所在网段的ip地址

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对DHCP服务器的:

#vi /etc/dhcpd.conf

进入文本配置界面

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ddns-update-style interim;

ignore client-updates;

option subnet-mask   255.255.255.0;

option nis-domain   "domain.org";

option domain-name   "domain.org";

option time-offset   -18000; # Eastern Standard Time

default-lease-time 259200;
max-lease-time 777600;

option domain-name-servers 202.96.134.133,202.96.128.68;

option broadcast-address 192.168.5.255;

#DNS服务器地址

#下面配置超级作用域

shared-nework mynet{

      subnet 192.168.5.0 netmask 255.255.255.0 {

                               option routers    192.168.5.1;

                range dynamic-bootp 192.168.5.1 192.168.5.254;

    }

   subnet 192.168.6.0 netmask 255.255.255.0 {

                               option routers    192.168.6.1;

                range dynamic-bootp 192.168.6.1 192.168.6.254;

    }

   subnet 192.168.7.0 netmask 255.255.255.0 {

                               option routers    192.168.7.1;

                range dynamic-bootp 192.168.7.1 192.168.7.254;

    }

}

#################################################################

下面我们将配置中继代理服务器

首先要配置文件/etc/sysconfig/dhcrealy.conf

#vi /etc/sysconfig/dhcrealy.conf

在里面输入:

INTERFACES="eth1 eth2"

DHCPSERVERS-"192.168.5.2"

下面启动dhcrelay

#dhcrelay -i eth1 -i eth2 192.168.5.2

最后,我们启动DHCP服务器:

#service dhcpd restart

用pc1,pc2,pc3进行测试: