DHCP、DHCP中继（实例讲解）

逃离我推掉我的手 2021-07-26 20:17 826阅读 0赞

## DHCP、DHCP中继 ##

准备工具：Cisco Packet Tracer Student

## 一、DHCP ##

实验拓扑：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3h1eWluZw_size_16_color_FFFFFF_t_70_pic_center]

**一、配置交换机：**  
Switch>ena  
Switch\#conf  
Configuring from terminal, memory, or network \[terminal\]?  
Enter configuration commands, one per line. End with CNTL/Z.  
Switch(config)\#vlan 10  
Switch(config-vlan)\#vlan 20  
Switch(config-vlan)\#exit  
Switch(config)\#int f0/1  
Switch(config-if)\#sw acc vlan 10  
Switch(config-if)\#int f0/2  
Switch(config-if)\#sw acc vlan 20  
Switch(config-if)\#int f0/3  
Switch(config-if)\#sw mode trunk  
Switch(config-if)\#exit  
**二、配置路由器：**

1、配网关：  
Router>ena  
Router\#conf  
Configuring from terminal, memory, or network \[terminal\]?  
Enter configuration commands, one per line. End with CNTL/Z.  
Router(config)\#int f0/0  
Router(config-if)\#no shu  
Router(config-if)\#int f0/0.10  
Router(config-subif)\#encapsulation dot1Q 10  
Router(config-subif)\#ip address 192.168.10.254 255.255.255.0  
Router(config-subif)\#int f0/0.20  
Router(config-subif)\#encapsulation dot1Q 20  
Router(config-subif)\#ip address 192.168.20.254 255.255.255.0  
Router(config-subif)\#do show ip int b

2、配置DHCP服务：  
Router(config)\#ip dhcp pool vlan10 创建地址池  
Router(dhcp-config)\#network 192.168.10.0 255.255.255.0 网段、子网掩码  
Router(dhcp-config)\#default-router 192.168.10.254 默认网关  
Router(dhcp-config)\#dns-server 1.1.1.1 DNS服务器地址  
Router(dhcp-config)\#exit  
Router(config)\#ip dhcp excluded-address 192.168.10.1 192.168.10.10 排除地址  
Router(config)\#ip dhcp pool vlan20  
Router(dhcp-config)\#network 192.168.20.0 255.255.255.0  
Router(dhcp-config)\#default-router 192.168.20.254  
Router(dhcp-config)\#dns-server 1.1.1.1  
Router(dhcp-config)\#exit  
Router(config)\#ip dhcp excluded-address 192.168.20.1 192.168.20.10

**三、测试**  
![在这里插入图片描述][20200918203919806.png_pic_center]  
![在这里插入图片描述][20200918203929246.png_pic_center]  
成功！就是这样做！

## 二、DHCP中继 ##

实验拓扑：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3h1eWluZw_size_16_color_FFFFFF_t_70_pic_center 1]  
**一、配置交换机：**  
Switch>ena  
Switch\#conf  
Configuring from terminal, memory, or network \[terminal\]?  
Enter configuration commands, one per line. End with CNTL/Z.  
Switch(config)\#vlan 10  
Switch(config-vlan)\#vlan 20  
Switch(config-vlan)\#exit  
Switch(config)\#int f0/1  
Switch(config-if)\#sw acc vlan 10  
Switch(config-if)\#int f0/2  
Switch(config-if)\#sw acc vlan 20  
Switch(config-if)\#int f0/3  
Switch(config-if)\#sw mode trunk  
Switch(config-if)\#exit

**二、配置路由器router0：**  
Router>ena  
Router\#conf  
Configuring from terminal, memory, or network \[terminal\]?  
Enter configuration commands, one per line. End with CNTL/Z.  
Router(config)\#int f0/0  
Router(config-if)\#no shu  
Router(config-if)\#int f0/0.10  
Router(config-subif)\#encapsulation dot1Q 10  
Router(config-subif)\#ip address 192.168.10.254 255.255.255.0  
Router(config-subif)\#ip helper-address 12.1.1.1 配置中继  
Router(config-subif)\#int f0/0.20  
Router(config-subif)\#encapsulation dot1Q 20  
Router(config-subif)\#ip address 192.168.20.254 255.255.255.0  
Router(config-subif)\#ip helper-address 12.1.1.1 配置中继  
Router(config-subif)\#exit  
Router(config)\#int f0/1  
Router(config-if)\#ip add 12.1.1.2 255.255.255.0  
Router(config-if)\#no shutdown

**三、配置路由器router2：**  
Router>ena  
Router\#conf  
Configuring from terminal, memory, or network \[terminal\]?  
Enter configuration commands, one per line. End with CNTL/Z.  
Router(config)\#int f0/0  
Router(config-if)\#ip add 12.1.1.1 255.255.255.0  
Router(config-if)\#no shutdown  
Router(config-if)\#exit  
Router(config)\#ip route 0.0.0.0 0.0.0.0 12.1.1.2 配置路由  
Router(config)\#ip dhcp pool vlan10  
Router(dhcp-config)\#network 192.168.10.0 255.255.255.0  
Router(dhcp-config)\#default-router 192.168.10.254  
Router(dhcp-config)\#dns-server 1.1.1.1  
Router(dhcp-config)\#exit  
Router(config)\#ip dhcp pool vlan20  
Router(dhcp-config)\#network 192.168.20.0 255.255.255.0  
Router(dhcp-config)\#default-router 192.168.20.254  
Router(dhcp-config)\#dns-server 1.1.1.1  
Router(dhcp-config)\#exit  
Router(config)\#

**四、测试**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3h1eWluZw_size_16_color_FFFFFF_t_70_pic_center 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3h1eWluZw_size_16_color_FFFFFF_t_70_pic_center 3]  
成功了！就是这样配置！

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3h1eWluZw_size_16_color_FFFFFF_t_70_pic_center]: /images/20210726/110301a730b54422bbf9885738a137cb.png
[20200918203919806.png_pic_center]: /images/20210726/afd1f8f27ffb471db2114577ed831caf.png
[20200918203929246.png_pic_center]: /images/20210726/8213f6e8853b4e4eaa9ab77e1bfa3c5f.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3h1eWluZw_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20210726/e2c4677fd6fc4ffb8911fb57c4e24a84.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3h1eWluZw_size_16_color_FFFFFF_t_70_pic_center 2]: /images/20210726/538191a9d5fd4160951be376e2e81e90.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d1b3h1eWluZw_size_16_color_FFFFFF_t_70_pic_center 3]: /images/20210726/fc96d77ab6154e15842974bdb32733fa.png