服务器端口号 67
客户端端口号 68
实验过程：
第一步：R1的DHCP
R1(config)#service dhcp
R1(config)#no ip dhcp conflict logging
//关闭DHCP冲突记录功能
R1(config)#ip DHCP pool libo
//配置一个DHCP地址池，名称为libo
R1(DHCP-config)#network 192.168.0.0 /24
//配置DHCP分配192.168.0.0/24这个网段的ip地址
R1(DHCP-config)#default-router 192.168.0.1
//配置默认网关地址
R1(DHCP-config)#dns-server 61.134.1.4
//配置DNS服务器地址61.134.1.4
R1(DHCP-config)#domain-name www.woyaoxiuxi.com\`\`
//配置域名为：
R1(DHCP-config)#lease infinite
//设置地址租期无限
R1(DHCP-config)#exit
R1(config)#ip DHCP excluded-address 192.168.0.1
//配置DHCP不要分发192.168.0.1这个ip地址
R1(config)#end
第二步：配置R2和R3上的接口
2(config)#int f0/0
R2(config-if)#ip add dhcp
R2(config-if)#no sh
_Nov 26 21:04:54.943: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 192.168.0.2, mask 255.255.255.0, hostname R2
//R2的f0/0接口获得一个192.158.0.2的ip地址
R3(config)#int f0/0
R3(config-if)#ip add dhcp
R3(config-if)#no sh
_Nov 26 21:05:12.191: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/0 assigned DHCP address 192.168.0.3, mask 255.255.255.0, hostname R3
//R3的f0/0接口获得一个192.168.0.3的地址
第三步：在R1上查看DHCP池的情况
R1#sh ip dhcp pool libo
Pool libo :
Utilization mark (high/low) : 100 / 0
Subnet size (first/next) : 0 / 0
Total addresses : 254
Leased addresses : 2
Pending event : none
1 subnet is currently in the pool :
Current index IP address range Leased addresses
192.168.0.4 192.168.0.1 - 192.168.0.254 2
//当前未被租用的， 地块范围 ，租用数
R1#sh ip dhcp binding
Bindings from all pools not associated with VRF:
IP address Client-ID/ Lease expiration Type
Hardware address/
User name
192.168.0.2 0063.6973.636f.2d63. Infinite Automatic
6139.322e.3035.6563.
2e30.3030.302d.4661.
302f.30
192.168.0.3 0063.6973.636f.2d63. Infinite Automatic
6139.332e.3037.3830.
2e30.3030.302d.4661.
302f.30
第四步：show 一下，ping一下
R2#sh ip in b
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 192.168.0.2 YES DHCP up up
Serial2/0 unassigned YES unset administratively down down
Serial2/1 unassigned YES unset administratively down down
R2#ping 192.168.0.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 8/28/60 ms
