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1、DHC P障案例本案例背景为:PC作为DHCP客户端获取地址耗费时间过长。组网环境曰him1.1 J超DHCP diercO«CF Client案例组网图故障现象以PC做为DHCP客户端，通过 DHCP申请地址，经过1分钟左右才能获取地址。处理过程检查DHCP服务器配置DHCP服务器上的配置如下，不存在问题。dhc P server ip-pool 1 network 1.1.0.0 mask 255.255.0.0interface Ethernet1/0 port link-mode route ip address 1.1.1.1 255.255.255.0 dhcp enab

2、le的状态检查 DHCP 服务器上接口 Ethernet1/0与 DHCP 客户端相连的接口 Ethernet1/0 处于 up 状态。server display ip interface brief Ethernet 1/0 *down: administratively down (s): spoofingInterface Physical Protocol IP AddressEthernet1/0 up up 1.1.1.1检查物理连接是否通畅在 PC 上手工配置 IP 地址 1.1.1.2 ，可以 ping 通 DHCP 服务器的 IP 地址 1.1.1.2 。通过调试信息进行定

3、位在用户视图下打开 DHCP 服务器的调试信息开关 debugging dhcp server allDHCP 服务器上打印如下调试信息：<server> debugging dhcp server all *May 27 13:02:19:494 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DHCPServer: Receive DHCPDISCOVER from 00e0-e100-0201.*May 27 13:02:19:494 2007 server DHCPS/7/DHCPS_DEBUG_PACKET:Rx, interface Eth

4、ernet1/0Message type: requestHardware type: 1, Hardware address length: 6Hops: 0, Transaction ID: 16777216Seconds: 0, Broadcast flag: 0Client IP address: 0.0.0.0 Your IP address: 0.0.0.0Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0Client hardware address: 00e0-e100-0201Server host naame

5、: Not Configured, Boot file name: Not ConfiguredDHCP message type: DHCP Discover *May 27 13:02:19:494 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DHCPServer: Assign Free Lease from global pool.*May 27 13:02:20:110 2007 server DHCPS/7/DHCPS_DEBUG_PACKET:Tx, interface Ethernet1/0Message type: replyHardware

6、 type: 1, Hardware address length: 6Hops: 0, Transaction ID: 16777216Seconds: 0, Broadcast flag: 0Client IP address: 0.0.0.0 Your IP address: 1.1.0.2Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0Client hardware address: 00e0-e100-0201Server host naame: Not Configured, Boot file name: Not

7、 ConfiguredDHCP message type: DHCP Offer *May 27 13:02:20:110 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DhcpServer: Failed to send DHCPOFFER to MAC=> 00e0-e100-0201 .*May 27 13:02:20:110 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DHCPServer: Sending DHCPOFFER failed!*May 27 13:09:54:228 2007 server DHCP

8、S/7/DHCPS_DEBUG_COMMON:DHCPServer: Receive DHCPDISCOVER from 00e0-e100-0201.*May 27 13:09:54:228 2007 server DHCPS/7/DHCPS_DEBUG_PACKET:Rx, interface Ethernet1/0Message type: requestHardware type: 1, Hardware address length: 6Hops: 0, Transaction ID: 266602672Seconds: 0, Broadcast flag: 1Client IP a

9、ddress: 0.0.0.0 Your IP address: 0.0.0.0Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0Client hardware address: 00e0-e100-0201Server host naame: Not Configured, Boot file name: Not ConfiguredDHCP message type: DHCP Discover *May 27 13:09:54:228 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DHCPS

10、erver: Assign Free Lease from global pool.*May 27 13:09:54:816 2007 server DHCPS/7/DHCPS_DEBUG_PACKET:Tx, interface Ethernet1/0Message type: replyHardware type: 1, Hardware address length: 6Hops: 0, Transaction ID: 266602672Seconds: 0, Broadcast flag: 1Client IP address: 0.0.0.0 Your IP address: 1.1

11、.0.2Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0Client hardware address: 00e0-e100-0201Server host naame: Not Configured, Boot file name: Not ConfiguredDHCP message type: DHCP Offer *May 27 13:09:54:816 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DhcpServer: Send DHCPOFFER to 00e0-e100-0201

12、 Offer IP=> 1.1.0.2.*May 27 13:09:54:848 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DHCPServer: Receive DHCPREQUEST from 00e0-e100-0201.*May 27 13:09:54:848 2007 server DHCPS/7/DHCPS_DEBUG_PACKET:Rx, interface Ethernet1/0Message type: requestHardware type: 1, Hardware address length: 6Hops: 0, Transa

13、ction ID: 266602672Seconds: 0, Broadcast flag: 1Client IP address: 0.0.0.0 Your IP address: 0.0.0.0Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0Client hardware address: 0000-5e00-4701Server host naame: Not Configured, Boot file name: Not ConfiguredDHCP message type: DHCP Request *May 27

14、 13:09:54:848 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DHCPServer: Acknowledge the DHCPREQUEST message!*May 27 13:09:54:848 2007 server DHCPS/7/DHCPS_DEBUG_PACKET:Tx, interface Ethernet1/0Message type: replyHardware type: 1, Hardware address length: 6Hops: 0, Transaction ID: 266602672Seconds: 0, Broad

15、cast flag: 0Client IP address: 0.0.0.0 Your IP address: 1.1.0.2Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0Client hardware address: 00e0-e100-0201Server host naame: Not Configured, Boot file name: Not ConfiguredDHCP message type: DHCP Ack *May 27 13:09:54:848 2007 server DHCPS/7/DHCPS_

16、DEBUG_COMMON:DhcpServer: Send DHCPACK to 00e0-e100-0201 Offer IP=> 1.1.0.2.*May 27 13:09:54:848 2007 server DHCPS/7/DHCPS_DEBUG_COMMON:DHCPServer: Requesting security module(s) to add a security entry (1.1.0.4 00e0-e100-0201) succeeded.DHCP-OFFER 报文的时候发送失败从 debug 信息分析， PC 发送了 5 个 DHCP-DISCOVER 报文后才申请到了地址。前 4 个， DHCP 服务器都分配了租约，但在发送 了，直到 PC 发送了第 5 个 DHCP-DISCOVER 报文后， DHCP 服务器才成功分配了 租约。比较第 5 个 DHCP-DISCOVER 报文与前 4 个的不同，发现报文的 Broadcas

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