DHCP中继配置案例

需求：在不同网段获取IP地址

1. Router为DHCP服务器，开启DHCP服务，为PC分配地址，使用地址池网段为192.168.1.0/24,


2. 地址池中排除掉地址192.168.1.254，192.168.1.253 ,这些地址留作他用


3. 为客户端分配的网关地址是：192.168.1.254，分配租期为2天。DNS服务器地址为：8.8.8.8


4. SW上部署两个VLAN；分别是VLAN10，VLAN20，PC属于VLAN10，Router属于VLAN20


5. 要求PC机器能够通过DHCP自动获取IP地址和网关。

实现步骤

1. 交换机配置vlan

   sys
[Huawei]sys SW
# 将 1端口划分 vlan10 24端口划分vlan 20
[SW]vlan batch 10 20
[SW]int g0/0/1
[SW-GigabitEthernet0/0/1]port link-type access
[SW-GigabitEthernet0/0/1]port default vlan 10
[SW-GigabitEthernet0/0/1]int g0/0/24
[SW-GigabitEthernet0/0/24]port link-type access
[SW-GigabitEthernet0/0/24]port default vlan 20
[SW-GigabitEthernet0/0/24]int vlanif 10
[SW-Vlanif10]ip address 192.168.1.254 24
[SW-Vlanif10]int vlanif 20
[SW-Vlanif20]ip address 192.168.2.1 24

   




2. 路由器配置地址池

   sys
[Huawei]sys Router
[Router]int g0/0/0
[Router-GigabitEthernet0/0/0]ip address 192.168.2.2 24
# 启动dhcp服务
# 创建地址池
[Router]dhcp enable
[Router]ip pool dhcppool #命名为 dhcppool
[Router-ip-pool-dhcppool]dns-list 8.8.8.8 #dns 设置
# 设置网关
[Router-ip-pool-dhcppool]gateway-list 192.168.1.254
# 分配网段
[Router-ip-pool-dhcppool]network 192.168.1.0 mask 24
# 排除分配，预留他用
[Router-ip-pool-dhcppool]excluded-ip-address 192.168.1.250 192.168.1.253
# 设置租期2天
[Router-ip-pool-dhcppool]lease day 2
[Router-ip-pool-dhcppool]dis this
[V200R003C00]
#
ip pool dhcppool
gateway-list 192.168.1.254
network 192.168.1.0 mask 255.255.255.0
excluded-ip-address 192.168.1.250 192.168.1.253
lease day 2 hour 0 minute 0
dns-list 8.8.8.8
#
return

# 进入端口0 ，启用dhcp 地址池
[Router]int g0/0/0
[Router-GigabitEthernet0/0/0]dhcp select global
# 返程路由
[Router]ip route-static 192.168.1.0 24 192.168.2.1

   




3. 交换机DHCP中继

   
[SW]dhcp enable
[SW]int vlanif 10
[SW-Vlanif10]dhcp select relay
#中继服务器地址 可以把192.168.2.2 地址池的地址分配给PC1
# 从192.168.2.2 地址池拿IP
[SW-Vlanif10]dhcp relay server-ip 192.168.2.2

   




4. PC从路由器预置地址池中获取IP地址

   PC>ipconfig
Link local IPv6 address...........: fe80::5689:98ff:fe2c:7b1f
IPv6 address......................: :: / 128
IPv6 gateway......................: ::
IPv4 address......................: 0.0.0.0
Subnet mask.......................: 0.0.0.0
Gateway...........................: 0.0.0.0
Physical address..................: 54-89-98-2C-7B-1F
DNS server........................:
PC>ipconfig
Link local IPv6 address...........: fe80::5689:98ff:fe2c:7b1f
IPv6 address......................: :: / 128
IPv6 gateway......................: ::
IPv4 address......................: 192.168.1.249
Subnet mask.......................: 255.255.255.0
Gateway...........................: 192.168.1.254
Physical address..................: 54-89-98-2C-7B-1F
DNS server........................: 8.8.8.8