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

   <Huawei>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

   <Huawei>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