CCNA-28、DHCP

模拟DHCP

先将PC这台路由器的路由功能关闭掉

Router(config)#no ip routing 
Router(config)#interface gigabitEthernet 0/0 
Router(config-if)#ip address dhcp         #开启DHCP模式
Router(config-if)#no shutdown 

Router#show run interface gigabitEthernet 0/0
Building configuration...
!
interface GigabitEthernet0/0
 ip address dhcp
 no ip route-cache
 duplex auto
 speed auto
 media-type rj45
end

Router#

WG(config)#interface gigabitEthernet 0/0
WG(config-if)#ip address 192.168.1.2 255.255.255.0
WG(config)#interface gigabitEthernet 0/1
WG(config-if)#ip address 192.168.2.1 255.255.255.0
WG(config-if)#no shutdown

DHCP(config)#interface gigabitEthernet 0/1
DHCP(config-if)#ip address 192.168.2.2 255.255.255.0
###l=====================================================
###l### 配置回去的路由，要不然PC的数据无法回去
DHCP(config)#ip route 192.168.1.0 255.255.255.0 192.168.2.1

DHCP(config)#ip dhcp pool  PC
DHCP(dhcp-config)#network 192.168.1.0 255.255.255.0
DHCP(dhcp-config)#default-router 192.168.1.2
DHCP(dhcp-config)#dns-server 8.8.8.8 

WG(config)#interface gigabitEthernet 0/0
WG(config-if)#ip helper-address 192.168.2.2      #在PC端相连的接口配置DHCP服务器的地址

###PC这时就获取到地址了
*Nov 16 12:41:47.245: %DHCP-6-ADDRESS_ASSIGN: 
Interface GigabitEthernet0/0 assigned DHCP address 192.168.1.1, mask 255.255.255.0, hostname 


PC(config)#interface gigabitEthernet 0/0
PC(config-if)#shutdown 
PC(config-if)#no shutdown       #在重启接口后就会获取到一个新的地址
PC(config)#
*Nov 16 12:50:15.694: %DHCP-6-ADDRESS_ASSIGN: 
Interface GigabitEthernet0/0 assigned DHCP address 192.168.1.3, mask 255.255.255.0, hostname PC

PC#
*Nov 16 12:59:01.581: %DHCP-6-ADDRESS_ASSIGN: 
Interface GigabitEthernet0/0 assigned DHCP address 192.168.1.1, mask 255.255.255.0, hostname PC

PC#sh ip interface brief 
Interface                  IP-Address      OK? Method Status                Protocol
GigabitEthernet0/0         192.168.1.1     YES DHCP   up                    up      
GigabitEthernet0/1         unassigned      YES unset  administratively down down    
GigabitEthernet0/2         unassigned      YES unset  administratively down down    
GigabitEthernet0/3         unassigned      YES unset  administratively down down    
PC#


=============================================
####DHCP服务器端已经显示一台设备上线了
DHCP(config)#do sh ip dhcp binding 
Bindings from all pools not associated with VRF:
IP address          Client-ID/              Lease expiration        Type
                    Hardware address/
                    User name
192.168.1.1         0063.6973.636f.2d35.    Nov 16 2022 01:04 PM    Automatic
                    3037.302e.3466.3030.
                    2e63.3030.302d.4769.
                    302f.30
DHCP(config)#

DHCP静态绑定

###DHCP配置
DHCP(config)#ip dhcp pool static
DHCP(dhcp-config)#host 192.168.1.100 255.255.255.0    #分配的固定地址
 #客户机的MAC地址，注意MAC前要加01+MAC
DHCP(dhcp-config)#client-identifier 015070.4f00.c000      #客户机的MAC地址，注意MAC前要加01+MAC
 #客户机的MAC地址，注意MAC前要加01+MAC
DHCP(dhcp-config)#default-router 192.168.1.2 
DHCP(dhcp-config)#dns-server 8.8.8.8 


####PC要在接口下配置，让他用PC  gigabitEthernet 0/0的MAC去请求DHCP
PC(config)#interface gigabitEthernet 0/0
PC(config-if)#ip address dhcp  client-id gigabitEthernet 0/0

####再重启接口
PC(config-if)#shutdown 
PC(config-if)#no shutdown 

####DHCP绑定就生效了
PC#
*Nov 16 13:24:16.846: %DHCP-6-ADDRESS_ASSIGN: 
Interface GigabitEthernet0/0 assigned DHCP address 192.168.1.100, mask 255.255.255.0, hostname PC

PC#
PC#sh ip interface brief 
Interface                  IP-Address      OK? Method Status                Protocol
GigabitEthernet0/0         192.168.1.100   YES DHCP   up                    up      
GigabitEthernet0/1         unassigned      YES unset  administratively down down    
GigabitEthernet0/2         unassigned      YES unset  administratively down down    
GigabitEthernet0/3         unassigned      YES unset  administratively down down    
PC#