cisco--DHCP

DHCP实验一、

要求：R5模拟三层交换机，R2、R3、R4模拟PC
三层交换机建立3个dhcp地址池分别分配给3个vlan

地址池名称       范围                           对应vlan
vlan10            192.168.10.0/24            vlan 10
vlan20            192.168.20.0/24            vlan 20
vlan30            192.168.30.0/24            vlan 30

R5:     模拟DHCP

R5(config)#int f0/3     
R5(config-if)#no switchport                                        默认为二层接口
R5(config-if)#ip add 192.168.11.254 255.255.255.0
R5(config-if)#no shutdown

R5(config-if)#end

R5#vlan database                     创建vlan10、20、30
R5(vlan)#vlan 10
R5(vlan)#vlan 20
R5(vlan)#vlan 30

R5(vlan)#exit

R5#conf te                                                                                    创建地址池，测试所以dns地址可以不添加
R5(config)#ip dhcp pool vlan10
R5(dhcp-config)#network 192.168.10.0 255.255.255.0
R5(dhcp-config)#default-router 192.168.10.254
R5(dhcp-config)#dns-server 8.8.8.8 114.114.114.114
R5(dhcp-config)#exit
R5(config)#ip dh po vlan20
R5(dhcp-config)#netw 192.168.20.0 255.255.255.0
R5(dhcp-config)#default-router 192.168.20.254
R5(dhcp-config)#exit
R5(config)#ip dh po vlan30
R5(dhcp-config)#netw 192.168.30.0 255.255.255.0

R5(dhcp-config)#default-router 192.168.30.254

R5(config)#int vlan 10                                                    为vlan创建网关地址
R5(config-if)#ip add 192.168.10.254 255.255.255.0
R5(config-if)#exit
R5(config)#int vlan 20
R5(config-if)#ip add 192.168.20.254 255.255.255.0
R5(config-if)#exit
R5(config)#int vlan 30
R5(config-if)#ip add 192.168.30.254 255.255.255.0

R5(config-if)#exit

R5(config)#int f0/0                                       为端口分配vlan         
R5(config-if)#switchport access vlan 10
R5(config-if)#exit
R5(config)#int f0/1
R5(config-if)#sw ac vlan 20
R5(config-if)#exit
R5(config)#int f0/2
R5(config-if)#sw ac vlan 30

R5(config-if)#exit

R5(config)#ip dhcp exc                                                                             去除不分配的IP地址
R5(config)#ip dhcp excluded-address 192.168.30.1 192.168.30.10

R4：   模拟PC     其他两台一样配置方法

R4#conf te
R4(config)#no ip routing 
R4(config)#int f0/0       
R4(config-if)#ip add dhcp
R4(config-if)#no shutdown
*Mar  1 00:06:24.091: %LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
*Mar  1 00:06:25.091: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
*Mar  1 00:07:12.823: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 192.168.30.11, mask 255.255.255.0, hostname R4
R4(config-if)#end
R4#ping 192.168.30.254
Sending 5, 100-byte ICMP Echos to 192.168.30.254, timeout is 2 seconds:
!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 56/253/1032 ms

实验二、    跨路由DHCP

要求：pc可以进过route获取到DHCP分配的地址

基础配置就不重复了，包括：

1、pc配置成自动获取IP
2、路由器两个端口设置IP
3、DHCP地址和地址池分配

只需要在路由器上配置这条命令即可，这样PC的请求报文就可以广播到DHCP服务器上

Route(config)#int f0/0
Route(config-if)#ip helper-address 192.168.2.2             

还需要在dhcp设备上配置一条静态路由，否则dhcp设备找不到回应的路径
DHCP(config)#ip route 192.168.1.0 255.255.255.0 192.168.2.1 

绑定IP和mac地址：

DHCP(config)#ip dhcp pool static
DHCP(dhcp-config)#host 192.168.1.100
DHCP(dhcp-config)#client-identifier 01cc01.099c.0000        此处01为固定添加字符
DHCP(dhcp-config)#default-router 192.168.1.254
DHCP(dhcp-config)#dns-server 8.8.8.8

PC：

PC(config-if)#ip add dhcp client-id f0/0       表示以f0/0接口获取IP
*Mar  1 00:35:21.375: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 192.168.1.100, mask 255.255.255.0, hostname PC