The fourth time can complete the task
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★ ☆ I originally created, no reproduced, copyright reserved ★ ☆ ★
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I said on the back, Xiao Z is worried about the unknown DHCP server in a corner of the building. There are two DHCPs inside a network, a machine starts, a broadcast, not to assign you which IP is assigned, and then the business unit calls, you said, Xiao Z can not be annoyed, can you not worry?
Going to A big brother? Since the little Z is more than a bad brother who called his boss, it seems that the face begins to thin. "Well, or I think about it myself, or from some of DHCP's theoretical knowledge.", Xiao Z thought about it, set your mind.
The thick "Windows 2000 Server TCP / IP Core Networking Guide" was smashed.
"Author: Why say is eating it?
Small Z: All is English, don't you use it? "
Xiao Z crossed the book to "How the Lease Process Works" carefully.
[Step 1: The client requests an IP address by broadcasting the DHCPDiscover message to the local network;
Step 2: The server side returns a DHCPOFFER message containing IP information and configuration information to the client; if there is no DHCP server, the client will work as follows:
1. If it is a Windows 2000 client, if the IP automatic configuration is not disabled, the client will configure an IP address to the NIC itself;
2, if it is not a Windows 2000 client, or automatic configuration is disabled, the network initialization fails, the client continues to turn over 4 times in the background, send a DHCPDiscover message every 5 minutes until it receives a DHCPoffer message. (Thought, 4 times, will not send it after 4 times?)
Step 3: Client Accept, and select the supplied address, reply to a DHCPRequest message;
Step 4: The client assigns this IP address, and the server returns a DHCPACK message containing other configuration information to approve this address rental;
Step 5: Once the client receives this approved message, he will use the DHCP option to configure your IP properties.
If the client requests an invalid or repetitive IP, the server returns a DHCPNAK message, and the client must resend the entire request process. 】
"That is, the client here will broadcast, there will be a server response, then ... the client gets a wrong IP. If I cut the first step, this can't get IP. "Small Z found a pen next to it, record all the problems in thinking. Then draw the following table and start looking for an answer.
Serial number My question Answer, 1 What is the network cable to do? 2 Can the network come separate? How to re-split? 3 DHCP is a radio, can you span route?
"Author: stupid, but also to get such a simple question for so long.
Small Z: Do not say answers, I want to get themselves. If you said, this protagonist you will come to you!
Author: @ ##% @ # $ @ # $ @ #!!!
Xiao Z: Just now, are you talking about Spanish?
The author's mouth spit, the white foam is fell away ...
Small Z: Finally quiet J "
Xia Zhou continued to start tossing this DHCP, the more I feel that I have a wise move that I originally selected DHCP service management company. A DHCP has done all your troubles: DNS, WINS, routing, IP address, if IP changes, what you need to do is to modify DHCP, then re-refresh client IP configuration. How to get a "cool" word. I think about it, Xiao Z can't help but float. "Haha, the client management is more and more convenient, I have more time to make MM, wow haha ..."
As for the current DHCP problem, Xiao Z seems to be forgotten.
"Small Z: Who said that I forgot? How can this simple problem? "
"It's actually very simple, my network cable is used to go online, that is, it is not to let my ISA server can access the network of the building. If I let the people in the building, I pulled it directly to me. Inside the machine room. I pulled the network cable of my connection building on my ISA server, and I was inserted directly. And, I believe that the switch of the building must be smart, so even the intersection does not need. Such arrangement DHCP Broadcasting is not possible to pass the ISA server, you know that ISA is not just a proxy, but also a firewall, "Xiao Z is facing the air, and it seems to say to someone.
"The author is confused," how can this be? "
Xiao Z: Just now not give you a face, hehe. "
"Moreover, Windows 2000 has also taken protective measures. If someone in the network does not carefully configure unauthorized DHCP services, the DHCP service will automatically stop at startup. Because the service automatically in Active Directory when the DHCP service is started Does the Query of the Query IP address ... "Xiao Z seems to pour it out of the things you just look at.
"Author: Enough, back to do me, ladies and gentlemen, meet again next time. I have some family members need to deal with, let's see again ... "
