*Jan 30 09:29:05:781 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; Receive a DHCPDISCOVER message from Vlan-interface7.
*Jan 30 09:29:05:781 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; No matching network for the client.
*Jan 30 09:29:05:909 2021 CORE-7506E-1 DHCPS/7/PACKET: -MDC=1;
From 0.0.0.0 port 68, interface Vlan-interface7
Message type: REQUEST (1)
Hardware type: 1, Hardware address length: 6
Hops: 0, Transaction ID: 3735448927
Seconds: 7, 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: 0cb5-2789-7a29
Server host name: not configured
Boot file name: not configured
DHCP message type: DHCPREQUEST (3)
*Jan 30 09:29:05:909 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; Receive a DHCPREQUEST message for 10.10.8.238 from Vlan-interface7; The server identifier is 10.10.0.1.
*Jan 30 09:29:05:909 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; The client selected another server.
*Jan 30 09:29:05:909 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; Failed to find the lease for 10.10.8.238.
*Jan 30 09:29:06:043 2021 CORE-7506E-1 DHCPS/7/PACKET: -MDC=1;
From 0.0.0.0 port 68, interface Vlan-interface7
Message type: REQUEST (1)
Hardware type: 1, Hardware address length: 6
Hops: 0, Transaction ID: 2685210220
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: 2601-1d4c-e09c Server host name: not configured
Boot file name: not configured
DHCP message type: DHCPDISCOVER (1)
*Jan 30 09:29:06:043 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; Receive a DHCPDISCOVER message from Vlan-interface7.
*Jan 30 09:29:06:043 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; No matching network for the client.
*Jan 30 09:29:07:153 2021 CORE-7506E-1 DHCPS/7/PACKET: -MDC=1;
From 0.0.0.0 port 68, interface Vlan-interface7
Message type: REQUEST (1)
Hardware type: 1, Hardware address length: 6
Hops: 0, Transaction ID: 2685210220
Seconds: 1, 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: 2601-1d4c-e09c
Server host name: not configured
Boot file name: not configured
DHCP message type: DHCPREQUEST (3)
*Jan 30 09:29:07:153 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; Receive a DHCPREQUEST message for 10.10.9.150 from Vlan-interface7;
The server identifier is 10.10.0.1.
*Jan 30 09:29:07:153 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; The client selected another server.
*Jan 30 09:29:07:153 2021 CORE-7506E-1 DHCPS/7/EVENT: -MDC=1; Failed to find the lease for 10.10.9.150.
请大神帮我解释下,谢谢,实在看不明白。
(0)
最佳答案
图1-2 IP地址动态获取过程
如图1-2所示,DHCP客户端从DHCP服务器获取IP地址,主要通过四个阶段进行:
(1) 发现阶段,即DHCP客户端寻找DHCP服务器的阶段。客户端以广播方式发送DHCP-DISCOVER报文。
(2) 提供阶段,即DHCP服务器提供IP地址的阶段。DHCP服务器接收到客户端的DHCP-DISCOVER报文后,根据IP地址分配的优先次序选出一个IP地址,与其他参数一起通过DHCP-OFFER报文发送给客户端。
(3) 选择阶段,即DHCP客户端选择IP地址的阶段。如果有多台DHCP服务器向该客户端发来DHCP-OFFER报文,客户端只接受第一个收到的DHCP-OFFER报文,然后以广播方式发送DHCP-REQUEST报文,该报文中包含DHCP服务器在DHCP-OFFER报文中分配的IP地址。
(4) 确认阶段,即DHCP服务器确认IP地址的阶段。DHCP服务器收到DHCP客户端发来的DHCP-REQUEST报文后,只有DHCP客户端选择的服务器会进行如下操作:如果确认将地址分配给该客户端,则返回DHCP-ACK报文;否则返回DHCP-NAK报文,表明地址不能分配给该客户端。
客户端收到服务器返回的DHCP-ACK确认报文后,会以广播的方式发送免费ARP报文,探测是否有主机使用服务器分配的IP地址,如果在规定的时间内未收到回应,并且客户端上不存在与该地址同网段的其他地址时,客户端才使用此地址。否则,客户端会发送DHCP-DECLINE报文给DHCP服务器,并重新申请IP地址。
如果网络中存在多个DHCP服务器,除DHCP客户端选中的服务器外,其它DHCP服务器中本次未分配出的IP地址仍可分配给其他客户端。
(0)
亲~登录后才可以操作哦!
确定你的邮箱还未认证,请认证邮箱或绑定手机后进行当前操作
举报
×
侵犯我的权益
×
侵犯了我企业的权益
×
抄袭了我的内容
×
原文链接或出处
诽谤我
×
对根叔社区有害的内容
×
不规范转载
×
举报说明
也可以详细看下哪个阶段出了问题