HCIP 数通实验文档：DHCP全局配置和中继实验

乾颐堂

1.DHCP地址排除

2.DHCP基于全局的配置

3.DHCP在交换机上的配置实验

4.DHCP中继实验

DHCP地址排除/DHCP基于全局的配置

interface GigabitEthernet0/0/1

ip address 192.168.1.1 255.255.255.0

interface GigabitEthernet0/0/2

ip address 192.168.2.1 255.255.255.0

[DHCP]dhcp enable

[DHCP]ip pool 1.0                                   //创建地址池

[DHCP-ip-pool-1.0]network 192.168.1.0 mask 24       //地址范围

[DHCP-ip-pool-1.0]gateway-list 192.168.1.1          //网关地址

[DHCP-ip-pool-1.0]excluded-ip-address 192.168.1.100 //排查服务器地址

[DHCP-ip-pool-1.0]lease day 0 hour 12               //修改租约时间

[DHCP-ip-pool-1.0]dns-list 8.8.8.8 114.114.114.114  //添加DNS地址

[DHCP-GigabitEthernet0/0/1]dhcp select global

[DHCP]ip pool 2.0

[DHCP-ip-pool-2.0]network 192.168.2.0 mask 24

[DHCP-ip-pool-2.0]gateway-list 192.168.2.1

[DHCP-ip-pool-2.0]lease day 0 hour 16

[DHCP-ip-pool-2.0]dns-list 8.8.8.8 114.114.114.114

[DHCP-ip-pool-2.0]static-bind ip-address 192.168.2.20 mac-address 5489-983c-5544    //静态绑定PC4地址

[DHCP-GigabitEthernet0/0/2]dhcp select global

DHCP在交换机上的配置实验

[DHCP]dhcp enable

[DHCP-Vlanif1]ip address 192.168.1.1 24

[DHCP-Vlanif1]dhcp select interface

[DHCP-Vlanif1]dhcp server dns-list 8.8.8.8

DHCP中继实验

[DHCP-10]dhcp enable

[DHCP-10]ip pool 10

[DHCP-10-ip-pool-10]network 192.168.10.0 mask 24

[DHCP-10-ip-pool-10]gateway-list 192.168.10.1

[DHCP-10-ip-pool-10]dns-list 8.8.8.8 114.114.114.114

[DHCP-10]ip pool 20

[DHCP-10-ip-pool-20]network 192.168.20.0 mask 24

[DHCP-10-ip-pool-20]gateway-list 192.168.20.1

[DHCP-10-ip-pool-20]dns-list 8.8.8.8 114.114.114.114

[DHCP-10-GigabitEthernet0/0/0]ip address 192.168.100.100 24

[DHCP-10-GigabitEthernet0/0/0]dhcp select interface         //该接口开启DHCP服务

[DHCP-10]ip route-static 192.168.10.0 24 192.168.100.1   

[DHCP-10]ip route-static 192.168.20.0 24 192.168.100.1      //配置静态回程路由

[Relay-GigabitEthernet0/0/0]ip address 192.168.100.1 24

[Relay-GigabitEthernet0/0/1]ip address 192.168.10.1 24

[Relay-GigabitEthernet0/0/2]ip address 192.168.20.1 24

[Relay-GigabitEthernet0/0/2]dhcp select relay                       //开启中继服务

[Relay-GigabitEthernet0/0/2]dhcp relay server-ip 192.168.100.100    //DHCP服务地址为xxx.xxx.xxx.xxx

[Relay-GigabitEthernet0/0/1]dhcp select relay

[Relay-GigabitEthernet0/0/1]dhcp relay server-ip 192.168.100.100

三个终端成功获得对应网段地址！！！

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全局DHCP和交换机配置DHCP

如果使用交换机配置DHCP服务，则需要注意在三层接口上进行DHCP的配置和调用

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DHCP Relay中继

DHCP服务器通常不会和DHCP客户端一个网段。

而DHCP客户端的发现报文是基于广播的。那么广播报文就会三层接口丢弃。

DHCP中继就是一个广播变单播的过程。有了DHCP中继。就可以解决DHCP客户端和服务端非同网段的问题

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DHCP中工作原理

将客户端发送的广播报文变成单播报文，即可完成DHCP的中继