思科路由器做爲DHCP

Router 做爲 DHCP 服務器：(若是服務器與客戶端不在一個網段)
(依然是須要 DHCP-relay技術的)
一、啓動DHCP服務
service dhcp
二、排除不自動分配的DHCP地址
ip dhcp excluded-address 192.168.1.1 192.168.1.10
三、建立DHCP地址池
ip dhcp pool A
network 192.168.1.0 255.255.255.0 //指定自動分配的網段
default-router 192.168.1.254 //指定分配的網關
dns-server 8.8.8.8 //指定自動分配的 DNS 服務器
四、驗證與測試
show ip dhcp binding // 查看分配之後的IP地址

拓撲圖：

相關命令
路由R
Router>en
Router#configure terminal
Enter configuration commands, one per line. End with

CNTL/Z.
Router(config)#int gi0/0
Router(config-if)#no shu
Router(config-if)#ip address 10.10.1.1 255.255.255.0
Router(config-if)#ex
Router(config)#ip routing
Router(config)#ip route 192.168.10.0 255.255.255.0

10.10.1.2
Router(config)#ip route 192.168.20.0 255.255.255.0

10.10.1.2
Router(config)#service dhcp
Router(config)#ip dhcp excluded-address 192.168.10.3

192.168.10.10
Router(config)#ip dhcp pool a
Router(dhcp-config)#network 192.168.10.0 255.255.255.0
Router(dhcp-config)#default-router 192.168.10.1
Router(dhcp-config)#dns-server 8.8.8.8
Router(dhcp-config)#ex
Router(config)#ip dhcp pool b
Router(dhcp-config)#network 192.168.20.0 255.255.255.0
Router(dhcp-config)#default-router 192.168.20.1
Router(dhcp-config)#dns-server 8.8.8.8
Router(dhcp-config)#ex
Router(config)#int gi0/0
Router(config-if)#no shu
Router(config-if)#ip address 10.10.1.1 255.255.255.0
Router(config-if)#ex
Router(config)#ip routing
Router(config)#ip route 192.168.10.0 255.255.255.0

10.10.1.2
Router(config)#ip route 192.168.20.0 255.255.255.0

10.10.1.2
Router(config)#service dhcp
Router(config)#ip dhcp excluded-address 192.168.10.3

192.168.10.10
Router(config)#ip dhcp pool a
Router(dhcp-config)#network 192.168.10.0 255.255.255.0
Router(dhcp-config)#default-router 192.168.10.1
Router(dhcp-config)#dns-server 8.8.8.8
Router(dhcp-config)#ex
Router(config)#ip dhcp pool b
Router(dhcp-config)#network 192.168.20.0 255.255.255.0
Router(dhcp-config)#default-router 192.168.20.1
Router(dhcp-config)#dns-server 8.8.8.8
Router(config)#exit

多層交換機

Switch>en
Switch#configure t
Enter configuration commands, one per line. End with

CNTL/Z.
Switch(config)#vlan 10
Switch(config-vlan)#vlan 20
Switch(config-vlan)#ex
Switch(config)#int f0/3
Switch(config-if)#switchport trunk encapsulation dot1q
Switch(config-if)#switchport mode trunk
Switch(config-if)#ex
Switch(config)#int f0/4
Switch(config-if)#switchport trunk encapsulation dot1q
Switch(config-if)#switchport mode trunk
Switch(config-if)#ex
Switch(config)#int vlan 10
Switch(config-if)#ip add 192.168.10.1 255.255.255.0
Switch(config-if)#ip help
Switch(config-if)#ip helper-address 10.10.1.1
Switch(config-if)#ex
Switch(config)#int vlan 20
Switch(config-if)#ip address 192.168.20.1 255.255.255.0
Switch(config-if)#ip helper-address 10.10.1.1
Switch(config-if)#ex
Switch(config)#service dhcp
Switch(config)#int vlan 1
Switch(config-if)#no shu
Switch(config-if)#ip address 10.10.1.2 255.255.255.0
Switch(config-if)#ex
Switch(config)#int f0/4
Switch(config-if)#no shu

交換機
Switch>en
Switch#configure terminal
Enter configuration commands, one per line. End with

CNTL/Z.Switch(config)#vlan 10Switch(config-vlan)#vlan 20Switch(config-vlan)#exSwitch(config)#int f0/1Switch(config-if)#sw mo a Switch(config-if)#sw a v 10Switch(config-if)#exSwitch(config)#int f0/2Switch(config-if)#sw mo a Switch(config-if)#sw a % Incomplete command.Switch(config-if)#sw a v 20Switch(config-if)#exiSwitch(config)#int f0/3Switch(config-if)#sw mo tr