詳解DHCP中繼配置,向不同網段分配IP位址

組網要求：

1、Router為DHCP伺服器，開啟DHCP服務，為PC分配地址。使用的地址池網段為192.168.1.0/24，並且地址池中需排除掉地址192.168.1.254、192.168.1.253，因為這些地址不能分配給PC。同時為客戶端分配的網關地址是192.168.1.254，所分配的地址租期為2天。客戶端自動獲取的DNS伺服器地址為8.8.8.8。

2、SW上部署了兩個VLAN：分別是vlan10及vlan20；PC屬於VLAN10，Router屬於VLAN20；

3、要求PC機能夠通過DHCP自動獲取地址及網關。

一、eNSP詳解視頻：

二、IP設置：

PC1:自動獲取IP位址，網關自動獲取

PC2、自動獲取IP位址

SW：vlanif10:192.168.1.254/24

Vlanif20:192.168.2.1/24

Router：192.168.2.2/24

三、配置步驟：

Router的配置如下：

[Router] interface GigabitEthernet 0/0/0

[Router-GigabitEthernet0/0/0] ip address 192.168.2.2 24

[Router] dhcp enable#全局使能DHCP服務

[Router] ip pool dhcppool#創建地址池

[Router-ip-pool-dhcppool] network 192.168.1.0 mask 24

[Router-ip-pool-dhcppool] gateway-list 192.168.1.254

[Router-ip-pool-dhcppool] lease day 2

[Router-ip-pool-dhcppool] dns-list 8.8.8.8

[Router-ip-pool-dhcppool] quit

[Router] interface GigabitEthernet 0/0/0

[Router-GigabitEthernet0/0/0] dhcp select global#使能接口的DHCP服務功能，從該接口從全局地址池分配地址

核心交換機的配置如下：

[SW] vlan batch 10 20

[SW] interface GigabitEthernet 0/0/1

[SW-GigabitEthernet0/0/1] port link-type access

[SW-GigabitEthernet0/0/1] port default vlan 10

[SW] interface GigabitEthernet 0/0/24

[SW-GigabitEthernet0/0/24] port link-type access

[SW-GigabitEthernet0/0/24] port default vlan 20

[SW]interface Vlanif 10

[SW-Vlanif10] ip address 192.168.1.254 24

[SW-Vlanif10] interface vlanif 20

[SW-Vlanif20] ip address 192.168.2.1 24

[SW-Vlanif20] quit

[SW] dhcp enable#交換機首先全局開啟DHCP服務

[SW] interface Vlanif 10

[SW-Vlanif10] dhcp select relay#vlanif10使能DHCP中繼

[SW-Vlanif10] dhcp relay server-ip 192.168.2.2#配置DHCP伺服器的地址

路由器上增加靜態路由：

[Router] ip route-static 192.168.1.0 24 192.168.2.1

完成上述配置後，PC即可正常獲取地址。

四、Router的主要配置文件：

#

sysname Router

#

dhcp enable

#

ip pool dhcppool

gateway-list 192.168.1.254

network 192.168.1.0 mask 255.255.255.0

excluded-ip-address 192.168.1.253

lease day 2 hour 0 minute 0

dns-list 8.8.8.8

#

interface GigabitEthernet0/0/0

ip address 192.168.2.2 255.255.255.0

dhcp select global

#

ip route-static 192.168.1.0 255.255.255.0 192.168.2.1

#

return

五、SW的主要配置文件：

#

sysname SW

#

vlan batch 10 20

#

dhcp enable

#

interface Vlanif1

#

interface Vlanif10

ip address 192.168.1.254 255.255.255.0

dhcp select relay

dhcp relay server-ip 192.168.2.2

#

interface Vlanif20

ip address 192.168.2.1 255.255.255.0

#

interface MEth0/0/1

#

interface GigabitEthernet0/0/1

port link-type access

port default vlan 10

#

interface GigabitEthernet0/0/24

port link-type access

port default vlan 20

#

return

六、驗證結果

在PC1上使用ipconfig命令查看獲取的IP位址等信息。

PC>ipconfig

Link local IPv6 address...........: fe80::5689:98ff:fe14:7494

IPv6 address......................: :: / 128

IPv6 gateway......................: ::

IPv4 address......................: 192.168.1.252

Subnet mask.......................: 255.255.255.0

Gateway...........................: 192.168.1.254

Physical address..................: 54-89-98-14-74-94

DNS server........................: 8.8.8.8