网工必会实验：DHCP配置（中继）！

1. 实验目的

1. 熟悉DHCP中继的应用场景
2. 掌握DHCP中继的配置方法

2. 实验拓扑

DHCP中继配置实验拓扑如图所示：

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3. 实验步骤

1. IP地址的配置

AR1的配置

<Huawei>system-view

Enter system view, return user view with Ctrl+Z.

[Huawei]undo info-center enable

Info: Information center is disabled.

[Huawei]sysname AR1

AR2的配置

<Huawei>system-view

Enter system view, return user view with Ctrl+Z.

[Huawei]undo info-center enable

[Huawei]sysname AR2

[AR2]interface g0/0/1

[AR2-GigabitEthernet0/0/1]ip address 192.168.1.2 24

[AR2-GigabitEthernet0/0/1]quit

[AR2]interface g0/0/0

[AR2-GigabitEthernet0/0/0]ip address 23.1.1.2 24

[AR2-GigabitEthernet0/0/0]quit

AR3的配置

<Huawei>system-view

Enter system view, return user view with Ctrl+Z.

[Huawei]undo info-center enable

[Huawei]sysname AR3

[AR3]interface g0/0/1

[AR3-GigabitEthernet0/0/1]ip address 23.1.1.3 24

[AR3-GigabitEthernet0/0/1]quit

[AR3]ip route-static 192.168.1.0 24 23.1.1.2

1. DHCP的配置

AR1的配置

[AR1]dhcp enable ??//开启DHCP服务

[AR1]interface g0/0/0 ?//进入到接口g0/0/0

[AR1-GigabitEthernet0/0/0]ip address dhcp-alloc ??//地址通过DHCP分配

[AR1-GigabitEthernet0/0/0]quit

AR2的配置

[AR2]dhcp enable ?//开启DHCP服务

[AR2]dhcp server group joinlabs ?//创建DHCP服务器组名字叫joinlabs

[AR2-dhcp-server-group-joinlabs]dhcp-server 23.1.1.3 ?//DHCP服务器成员

[AR2-dhcp-server-group-joinlabs]quit

[AR2]interface g0/0/1

[AR2-GigabitEthernet0/0/1]dhcp ?select relay ??//在接口下开启DHCP中继功能

[AR2-GigabitEthernet0/0/1]dhcp relay server-select joinlabs

[AR2-GigabitEthernet0/0/1]quit

AR3的配置

[AR3]dhcp enable

[AR3]ip pool joinlabs

[AR3-ip-pool-joinlabs]network 192.168.1.0 mask 24

[AR3-ip-pool-joinlabs]gateway-list 192.168.1.2

[AR3-ip-pool-joinlabs]quit

[AR3]interface g0/0/1

[AR3-GigabitEthernet0/0/1]dhcp ?select global

[AR3-GigabitEthernet0/0/1]quit

4. 实验调试

1. 在AR1上查看接口IP地址

<AR1>display ip int b

*down: administratively down

^down: standby

(l): loopback

(s): spoofing

The number of interface that is UP in Physical is 2

The number of interface that is DOWN in Physical is 2

The number of interface that is UP in Protocol is 2

The number of interface that is DOWN in Protocol is 2

Interface ????????????????????????IP Address/Mask ?????Physical ??Protocol ?

GigabitEthernet0/0/0 ?????????????192.168.1.254/24 ????up ????????up ???????

GigabitEthernet0/0/1 ?????????????unassigned ??????????down ??????down ?????

通过以上输出可以看到，AR1的g0/0/0接口获得一个192.168.1.254的地址

1. 让AR1重新获取IP地址，然后在AR2的g0/0/0抓包分析：

第一个包：Discover

Discover的包文结构如图所示：

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第二个包：Offer

Offer的包文结构如图所示：

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第三个包：Request

Request的包文结构如图所示：

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第四个包：ACK

ACK的包文结构如图所示：

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