Implementation principle
Without a router, hosts on the same IP subnet can communicate. The hosts are not in the same network segment and cannot communicate with each other even if they are connected through a switch or hub. I do n’t believe you can try it. Use two hosts with different IP addresses (such as 192.168.1.1 and 192.168.2.1, use 255.255.255.0 as the subnet mask), even if the two computers are connected to the same hub or switch When only the TCP / IP protocol is used, they cannot communicate.
We know that a computer can have multiple IP addresses. If we bind more than two IP addresses to a server, one IP address is in a network segment (such as 192.168.1.0) and the other IP address is In another network segment (such as 192.168.2.0), if the server is provided with a routing function, these two IP addresses act as a gateway, you can connect the two network segments together. After searching information, we found that the "routing and remote access" service provided by Windows 2000 Server can provide routing functions well.
Configuration of "Routing and Remote Access"
To solve this problem, a server with a static IP address needs to be placed on the switch or hub connecting these two classrooms. This server needs to specify at least two IP addresses, one IP address is in the network segment where one classroom computer is located, and the other IP address is in the network segment where another classroom computer is located.
In the default state, Windows 2000 Server has installed the "Routing and Remote Access" service, but it is not configured, so you need to make related settings:
1. Log in as an administrator on the server, click "Start", there will be a "Computer Management" in the "Programs" group, click on the "Administrative Tools" program group, there is a "Routing and" "Remote access" item, click after finding, click "Configure and enable routing" item on the "Operation" menu that appears, the "Routing and Remote Access Server Installation Wizard" will appear, follow the wizard's prompts. Click the [Next] button, the options appear, we need to select "Network Router", because our purpose is to let Windows 2000 Server assume the responsibility of the router.
2. After clicking the [Next] button, a window to confirm the agreement will appear. Now the IPX / SPX protocol is no longer used, and the NetBEUI protocol is not a routable protocol, so we only need to route the TCP / IP protocol and select "Yes, all available protocols are on the list".
3. Click the [Next] button, there will be the option of whether to allow remote dial-in, because we are in the local area network, users are not allowed to dial into the local area network from the phone line, so select "No". Click the [Next] button again, it will prompt that the setting is completed. After clicking the [Finish] button, a prompt of "Starting Routing and Remote Access Service" will appear, and the "Routing and Remote Service" window after startup will be as shown in the attached figure.
Set up the client
After the service is enabled, it is not available immediately, but the client's IP address needs to be specified for the client. Although the router is turned on, the client computer does not know the IP address of the router (that is, the gateway), so it still cannot communicate.
The setting of the client is also very simple. Assuming that you use Windows 98 as the client, right-click on "My Network Places", click "Properties" in the pop-up menu, click "TCP / IP" in the protocol list, and click [Properties ] Button, the "TCP / IP Properties" dialog box will appear. In the "Gateway" tab, enter the IP address of the server in the IP address field under "New Gateway", and then click the [Add] button. The server has two IP addresses. Which one should I choose? Of course, I chose an IP address on the same network segment as the current host. That is, if the current host IP address is "192.168.1.150", then the IP address of the gateway is the IP address of "192.168.1.X". Of course, this does not need to be set on all computers, as long as it is set on computers that need to communicate across network segments.
After all the settings are completed, now you use the "ping" command to test whether the communication with another network segment is normal. If you set up the correct, communication will be no problem.
How to stop the service
If you want to interrupt the communication between the two network segments, how to achieve it? This is also very easy to achieve: Click on the "IP routing" in the "Routing and Remote Access" program, right-click on the "Local Area Connection" that appears on the right, Click "Properties" in the pop-up menu, a dialog box will appear, remove the check box on "Enable IP Router Manager".
If you have multiple network segments, you can also use this method, the principle is the same. If the switch or hub between the two classrooms is not directly connected, you need to install dual network cards on the server, each network card is connected to a switch or hub in a classroom, and then specify an IP address, and then enable "Routing and Remote Just visit the service.
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