RHEL5下 构建DHCP及中继服务器

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需求描述:

在网关主机中构建DHCP、DHCP中继服务器

1.为以下三个物理网段提供动态地址分配服务:

192.168.1.0/24

192.168.2.0/24

192.168.3.0/24

2.默认租约时间21600秒

3.最大租约时间43200秒

4.客户机使用的DNS服务器地址如下:

202.106.0.20

8.8.8.8

5.用于动态分配的IP 地址范围分别为:

192.168.1.100~192.168.1.200

192.168.2.100~192.168.2.200

192.168.3.100~192.168.3.200


网关主机各接口的IP地址作为对应网段的默认网关


实现思路:

1.确认服务器主机的网络地址配置正确

2.先配置好DHCP服务器

3.再配置DHCP中继服务器


验证实验结果

注意事项:

将虚拟机的内存设为256MB,进入字符模式,关闭不常用的系统服务程序

将DHCP服务器的默认网关指向DHCP中继服务器


GO

DHCP服务器的配置(网卡为vmnet2)

[root@dhcpserver ~]# service iptables stop

[root@dhcpserver ~]# setenforce 0

[root@dhcpserver ~]# cat/etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0

BOOTPROTO=static

ONBOOT=yes

HWADDR=00:0c:29:b3:f2:f5

IPADDR=192.168.1.2

NETMASK=255.255.255.0

GATEWAY=192.168.1.1

[root@dhcpserver ~]# service network restart

[root@dhcpserver ~]# ifconfig eth0

[root@dhcpserver ~]# yum -y install dhcp

[root@dhcpserver ~]# cp/usr/share/doc/dhcp-3.0.5/dhcpd.conf.sample /etc/dhcpd.conf

[root@dhcpserver ~]# vim /etc/dhcpd.conf

ddns-update-style interim;

ignore client-updates;

   default-lease-time 21600;

   max-lease-time 43200;

   optiondomain-name-servers   202.106.0.20,8.8.8.8;

   optiondomain-name       "Crushlinux.com";


subnet 192.168.1.0 netmask 255.255.255.0 {

   optionrouters         192.168.1.1;

   optionsubnet-mask       255.255.255.0;

   rangedynamic-bootp 192.168.1.100 192.168.1.200;

}


subnet 192.168.2.0 netmask 255.255.255.0 {

   optionrouters         192.168.2.1;

   optionsubnet-mask       255.255.255.0;

   range dynamic-bootp 192.168.2.100192.168.2.200;

}


subnet 192.168.3.0 netmask 255.255.255.0 {

   optionrouters         192.168.3.1;

   optionsubnet-mask       255.255.255.0;

   rangedynamic-bootp 192.168.3.100 192.168.3.200;

}


[root@dhcpserver ~]# service dhcpd restart

[root@dhcpserver ~]# chkconfig dhcpd on

[root@dhcpserver ~]# ping 192.168.1.1


DHCP中继服务器的配置(共3个网卡,第一个:vmnet2,第二个:vmnet3,第四个:vmnet4)

[root@DHCRELAY ~]# service iptables stop

[root@DHCRELAY ~]# setenforce 0

[root@DHCRELAY ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0  

DEVICE=eth0

BOOTPROTO=static

HWADDR=00:0c:29:e0:f7:26

ONBOOT=yes

IPADDR=192.168.1.1

NETMASK=255.255.255.0

GATEWAY=192.168.1.2


[root@DHCRELAY ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth1  

DEVICE=eth1

BOOTPROTO=static

HWADDR=00:0c:28:e0:f7:33

ONBOOT=yes

IPADDR=192.168.2.1

NETMASK=255.255.255.0


[root@DHCRELAY ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth2  

DEVICE=eth2

BOOTPROTO=static

HWADDR=00:0b:17:e0:f7:33

ONBOOT=yes

IPADDR=192.168.3.1

NETMASK=255.255.255.0

[root@DHCRELAY ~]# service network restart

[root@DHCRELAY ~]# ifconfig

[root@DHCRELAY ~]# ping 192.168.1.2

[root@DHCRELAY ~]# yum -y install dhcp

[root@DHCRELAY ~]# vim /etc/sysconfig/dhcrelay

INTERFACES="eth0 eth1 eth2"

DHCPSERVERS="192.168.1.2"

[root@DHCRELAY ~]# service dhcrelay start

[root@DHCRELAY ~]# service dhcrelay restart

[root@DHCRELAY ~]# chkconfig dhcrelay on

[root@DHCRELAY ~]# netstat �Ctulnp |grep dhcrelay


客户机测试

客户机网卡分别设置成vmnet2、vmnet3、vmnet4 获取IP地址进行测试

测试命令:

开始-->运行-->cmd

C:\Users\Crushlinux>cd \

C:\>ipconfig /release

C:\>ipconfig /renew


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