In order to apply for a preliminary test site for junior and middle-level computers, the unit spent a few hundred thousand yuan to build a standard LAN room last year, mainly for students' junior high-level training and examinations; the LAN mainly includes 36 P4-level Founder brand computers, two The cascading CISCO brand 10M/100M adaptive switch, and one HP server with two network cards installed, the Windows 2000 Server operating system installed in the server, the other workstations are installed Windows required for the junior high school computer test 98 operating system.
Recently, the unit is going to hold a training course on the Internet. In order to achieve the purpose of online training, the unit leader asked the author to find a way to make a small transformation on the LAN so that each workstation can be smooth. Convenient access to Internet content. After receiving the task, the author first checked the current connection status of the LAN and found that all the workstations were connected to the switch. The Windows 2000 server directly connected to the Internet through one of the network cards, and another network card was connected. In the switch. In view of this, the first thing that I think of in my mind is to realize the requirement that the intranet proposed by the leader can also access the Internet through the built-in Internet connection sharing function of Windows 2000 system; the general idea of this method is: one of the servers through the switch Directly connected to the LAN intranet, another network card directly connected to the Internet network, and then enable the connection sharing function for the network card connected to the Internet, so that all intranet workstations can access the Internet.
According to this line of thought, and another colleague to act quickly, bought the network cable, crystal head, and ready-related networking tools, make a good one Ethernet cable for connection to the Internet; Connect one end of the crystal head to one of the server's network cards, and the other end of the crystal head is connected to the RJ-45 port of the broadband fiber conversion equipment. Then, open the server's network property setting window, enter the TCP/IP parameter setting interface, assign a separate, public network IP address to the Internet connection network card, and set the gateway IP address and DNS server address; below, The author also manually enabled the Internet connection sharing function of the external network card. Once the function is enabled, the IP address of another network card connected to the internal network in the server automatically becomes "192.168.0.1", and the network mask address is also It is automatically set to "255.255.255.0". At this time, you can manually set the DNS parameters for connecting the internal network card, and finally click the "OK" button to complete all the parameter setting tasks on the server. Below, the author and colleagues split the action, open the TCP/IP parameter setting window of each workstation, set their IP addresses to 192.168.0.2, 192.168.0.3... in order, and set the network mask address to "255.255.255.0", the gateway address is uniformly set to "192.168.0.1", and the IP address of the DNS server is uniformly set to the same address as the server's DNS. After
complete all the tasks set, free to find a workstation and open the Run dialog box system, in which the implementation of the "ping 192.168.0.1" command, the results show that the internal LAN connections and network settings all Normally, I believe that any workstation can now access the contents of the Internet. At this time, another colleague needs to download a compression software on the Internet. After opening the IE browser and inputting the URL of Huajun Software Park, he found that the main page of the website could not be opened at all; then the colleague entered another URL. But still can't get online. From the status bar of the IE browser window, the author found that the domain name of the target website has been correctly parsed into an IP address, but the content of the website cannot be opened.
will not be connected to the Internet server has not it? But when I open IE browser window on the server side, free to enter a URL, the web content quickly on the show, it is clear that server can Normal Internet access; Is it that the workstation selected by the colleague itself has a problem? So I opened the system running dialog box in the workstation just now, and then pinged the gateway address and some addresses of the external website, the test results indicate the network connection. everything is normal. Now that the server is normal, the network connection settings are normal, will it be the client program - IE browser is damaged? At this point, I have to think of what to do; open the system workstation running dialogue Box, and execute the string command "sfc /scannow" in it, then the system actually found that IE has been damaged several times, I fixed them one by one, then restarted the computer system, and opened IE again. During the test, I found that the intranet still could not access the Internet. The author is still unwilling, and then click the "Tools" /"Internet Options" command in the menu bar of the IE browser to carefully check the Internet settings of the browser. After checking, the "Automatic Detection Settings" at the "LAN Settings" is found. The option was not selected; however, when I re-selected the option and quit the Internet Options Settings window, and then tested the Internet, the results did not progress. I have to open another workstation to test the Internet, but the result is still unable to access the Internet; what is even more surprising is that no matter which workstation is opened, the result of the final test is the same, that is, the content of the webpage cannot be opened.
God, busy to the present, is there no achievement at all? The author can't help but sigh! In addition to the sigh, the author turned his attention to the server, after all, every workstation can not access the Internet, then Basically, it can be concluded that the intranet is unable to access the Internet and has nothing to do with the client. Open the server's Network Neighborhood window, I found that the "shadow" of other workstations can be seen here, and regardless of which website the server side visits, IE browser can quickly display the content of the website, these phenomena indicate that the server is in the network parameters. There should be no problems with the setup. Then I wonder if the virus in the server is "disorderly"? Regardless of whether the server has a virus or not, it is safe to find the latest version of Rising anti-virus software, and thoroughly check the server system; After the virus was killed and waited, the server was found to have several new viruses, but unfortunately these viruses have little to do with the failure of the intranet to access the Internet, because after the viruses are cleared, the intranet is still unable to access the Internet. Intranet.
Does the network really is no way to access yet in desperation, I get down on all systems that may affect the Internet settings, re-sort it again in my mind;? Suddenly thought the server had Is the router set up as a local area network, will the system's "routing and remote access" function affect the intranet network? So I do not do, and endlessly open the system service list window, which will be "routing and remote" The access service is temporarily set to disabled, and then the server system is restarted. I thought that this fault will definitely be solved, but the actual Internet test once again gave the author a ruthless blow. The intranet turned out to be "indifferent"!
Just when the author intends to give up completely, the screen suddenly pops up. The firewall window prompts the author that the application needs to access the external network. Such a prompt is undoubtedly a gift in the snow, because the author has been busy to ignore the role of the software. The author believes that the failure of the intranet to access the Internet is definitely caused by the firewall, so the firewall that was turned on is quickly turned off, and then the IE browser is opened for testing, but the intranet still cannot open the web content. Even though I am still not discouraged, in order to minimize the impact of firewalls or other software on the server, I intend to completely uninstall some software and firewalls, so that the server is in a relatively "clean" environment. Intranet test. When you open the control panel window in the server and double-click the "Add/Remove Programs" icon to prepare for the software uninstallation in the application list window that pops up later, I found that MS-Proxy and WinGate are installed in the server. Two proxy server software. Oh, the server was once used as a proxy server for the LAN. Other workstations realized the purpose of sharing Internet access through MS-Proxy or WinGate agent software. Is it MS-Proxy or WinGate software running quietly in the background, resulting in Internet connection sharing and There is a conflict in the way the proxy server shares the Internet. The author subconsciously believes that this may be the crux of the intranet being unable to access the Internet.
In order to verify my own ideas, in the "Add /Remove Programs" application list window, the MS-Proxy and WinGate two proxy server software were all removed from the system, and the server system was restarted. After that, the author carefully opened the IE window of a workstation, and once again entered the website address of Huajun Software Park. After clicking the Enter key, IE started the action of searching the website address. Fortunately, this IE finally Did not let me down, and soon opened the main page of the Huajun Software Park. At this point, the author is not very reassured, and randomly entered the URL address of other websites to test, the test results finally let the author relieved, the intranet can finally access the external network content. At this point, it is not difficult to find that the intranet in this case is unable to access the Internet. In fact, it is caused by the conflict between the software related to the shared Internet.