今天闲来没事，在模拟器里面看了下DHCP 的debug报文，特发出来分享，如有不对的地方欢迎指出来！

[server]

*Apr 13 16:04:00:31 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DHCPServer: Receive DHCPDISCOVER from 00e0.1400.1200-GigabitEthernet0/1/0.  #客户端接口和MAC地址

*Apr 13 16:04:00:31 2012 server DHCPS/7/DHCPS_DEBUG_PACKET:

Rx, interface GigabitEthernet0/1/0        

    Message type: request        #报文类型请求报文

    Hardware type: 1, Hardware address length: 6       

    Hops: 0, Transaction ID: 883108507        #经过DHCP中继数0表示没有经过中继，#后面数字表示随机数

    Seconds: 0, Broadcast flag: 0     #单播  

    Client IP address: 0.0.0.0   Your IP address: 0.0.0.0     #DHCP客户端的ip地址   dhcp服务器分配给客户端的ip地址   

Server IP address: 0.0.0.0   Relay agent IP address: 0.0.0.0        #DHCP客户端获取IP地址等信息的服务器IP地址   

Client hardware address: 00e0-1400-1200        #DHCP客户端的MAC地址

    Server host name: Not Configured, Boot file name: Not Configured       

    DHCP message type: DHCP Discover   #发现阶段

 

*Apr 13 16:04:00:31 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DHCPServer: Assign Free Lease from global pool.  #查看地址池

*Apr 13 16:04:00:31 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DHCPServer: Sending ICMP ECHOREQUEST to target IP: 10.1.12.2.  #ping10.1.12.2

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DHCPServer: ICMP Timeout!  #超时

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DHCPServer: ICMP detecting finished. The target IP can be used for dhcp allocation. #icmp探测完成10.1.12.2ip可用

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_PACKET:

Tx, interface GigabitEthernet0/1/0        

    Message type: reply        #报文类型回应报文

    Hardware type: 1, Hardware address length: 6       

    Hops: 0, Transaction ID: 883108507       

    Seconds: 0, Broadcast flag: 0       

    Client IP address: 0.0.0.0   Your IP address: 10.1.12.2        #DHCP客户端ip地址，服务器端分配给客户端的ip地址

    Server IP address: 0.0.0.0   Relay agent IP address: 0.0.0.0       

    Client hardware address: 00e0-1400-1200       

    Server host name: Not Configured, Boot file name: Not Configured       

    DHCP message type: DHCP Offer  #提供阶段

 

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DhcpServer: Send DHCPOFFER to 00e0.1400.1200-GigabitEthernet0/1/0 Offer IP=> 10.1.12.2.

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DHCPServer: Receive DHCPREQUEST from 00e0.1400.1200-GigabitEthernet0/1/0.

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_PACKET:

Rx, interface GigabitEthernet0/1/0        

    Message type: request       

    Hardware type: 1, Hardware address length: 6       

    Hops: 0, Transaction ID: 883108507       

    Seconds: 0, Broadcast flag: 0       

    Client IP address: 0.0.0.0   Your IP address: 0.0.0.0       

    Server IP address: 0.0.0.0   Relay agent IP address: 0.0.0.0       

    Client hardware address: 00e0-1400-1200       

    Server host name: Not Configured, Boot file name: Not Configured       

    DHCP message type: DHCP Request  #    选择阶段

 

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DHCPServer: Acknowledge the DHCPREQUEST message!

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_PACKET:

Tx, interface GigabitEthernet0/1/0        

    Message type: reply       

    Hardware type: 1, Hardware address length: 6       

    Hops: 0, Transaction ID: 883108507       

    Seconds: 0, Broadcast flag: 0       

    Client IP address: 0.0.0.0   Your IP address: 10.1.12.2       

    Server IP address: 0.0.0.0   Relay agent IP address: 0.0.0.0       

    Client hardware address: 00e0-1400-1200       

    Server host name: Not Configured, Boot file name: Not Configured       

    DHCP message type: DHCP Ack  #确认阶段

 

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DhcpServer: Send DHCPACK to 00e0.1400.1200-GigabitEthernet0/1/0 Offer IP=> 10.1.12.2.

*Apr 13 16:04:00:484 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

DHCPServer: Requesting security module(s) to add a security entry (10.1.12.2 00e0-1400-1200) succeeded.

*Apr 13 16:04:11:31 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

 Checking for expired lease.

*Apr 13 16:04:27:250 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

 Checking for expired lease.

*Apr 13 16:04:43:734 2012 server DHCPS/7/DHCPS_DEBUG_COMMON:

 Checking for expired lease.