dhcp中继

dhcp配置命令

r1(config)#ip dhcp pool vlan100        //取地址池名

r1(dhcp-config)#network 192.168.1.0 /24     //下发ip地址段

r1(dhcp-config)#default-router 192.168.1.1    //下发默认网关

r1(dhcp-config)#dns-server 8.8.8.8 144.144.144.144    //下发dns

r1(dhcp-config)#lease 7    //设定地址租期

r1(config)#ip dhcp excluded-address 192.168.8.8 192.168.8.88    //保留ip地址

dhcp中继配置命令

m1(config-if)#ip helper-address 202.106.1.1    //指定dhcp中继ip地址

例：

dhcp及dhcp中继_第1张图片

sw1配置

!

interface FastEthernet1/1

switchport access vlan 10

!

interface FastEthernet1/2

switchport access vlan 20

!

interface FastEthernet1/15

switchport mode trunk

!

m1配置

!

interface FastEthernet1/0

no switchport

ip address 202.106.1.1 255.255.255.252

!

interface FastEthernet1/1

switchport mode trunk

!

interface Vlan10

ip address 192.168.10.1 255.255.255.0

ip helper-address 202.106.1.2

!

interface Vlan20

ip address 192.168.20.1 255.255.255.0

ip helper-address 202.106.1.2

!

r1配置

!

ip dhcp pool vlan10

  network 192.168.10.0 255.255.255.0

  default-router 192.168.10.1

  dns-server 8.8.8.8 144.144.144.144

!

ip dhcp pool vlan20

  network 192.168.20.0 255.255.255.0

  default-router 192.168.20.1

  dns-server 9.9.9.9 10.10.10.10

!

interface FastEthernet0/0

ip address 202.106.1.2 255.255.255.252

!

ip route 0.0.0.0 0.0.0.0 202.106.1.1

!