School LAN computer, through the main switch, can not access the Internet? High score!

ARP spoofing. Exclusion method: Go to DAOS, use ipconfig all to check the intranet MAC address of the ** server (recorded as A), and then ping the gateway on other computers (enter DOS), and then use ARP A to check the MAC address of the corresponding gateway (recorded as B).

See if A and B are the same, the same description is not ARP spoofing. Not the same, definitely ARP spoofing. You can bind the IP address and MAC address of the batch file, open Notepad, and the content is as follows:

echo arp –d

arp s 00-e0-11-12-14-15 and then save the above file as: and put it in the Start Menu launcher. The IP address and MAC address in the third line are both server's.

After the binding is completed, you can access the Internet normally.

ARP Virus! He mainly attacks Lu You, and suggests that you reinstall the system on every computer in the school and turn off Lu You for 5 minutes! Then each computer is installed with 360, open the ARP interception inside, and you're good to go!

Huh....We've been working on that for you for days!

Just buy a router (more than 100 yuan), cat-router-switch-each computer, so that every computer can access the Internet. Our school is. Originally, you could not use a router, but now Netcom has strengthened supervision, and only one machine can access the Internet for one IP.

It should be a static IP address, and you have to set it up.

The network signal of the computer classroom is not good, and changing the switch may be able to improve the first, but it may not completely solve the problem, and other factors need to be comprehensively considered

1.Whether the number of switch ports and performance meet the number of network devices and bandwidth requirements of the computer classroom. If the performance of the switch is insufficient, it can also lead to the problem of poor network signal.

2.What is the type of network cable and the quality of the laying. Deterioration or improper laying of network cables is also one of the common causes of poor signal, and changing switches cannot solve this problem.

3.Whether there are other sources of signal interference inside the classroom. Bluetooth devices, microwave ovens, etc. can also interfere with the network, which requires shielding the source of signal interference.

4.Whether the network access mode of the classroom meets the bandwidth requirements. If you use a common network cable to directly connect to the switch, the bandwidth may be insufficient, and you can consider using optical fiber access to increase the bandwidth.

5.Whether the IP address assignment and VLAN assignment are reasonable. If the IP address and VLAN are not properly configured, it will also affect the network performance.

6.How well other network devices such as wireless controllers, access points, are configured and performed. Configuration issues with these devices can also lead to degraded signal quality throughout the network.

To sum up, the poor network signal in the computer classroom is a comprehensive problem, and changing to a higher performance switch may play a certain role in improving it, but it may not completely solve the problem. It is also necessary to check other potential factors and troubleshoot and optimize network cables, IP addresses, signal interference, etc., in order to solve the problem of unstable network signals.

Yes,Win7You can open your wireless network management,Create a new wireless network,Create a new selection temporary,You step by step on the OK,Type selection WPE,If you choose WAP, you must set an 8-digit password,You can experience it yourself。 After it is built, you can open the {open network} in the lower right corner of your computer to find your new wireless, right-click on the connection and it's OK, others can search for it, and you can connect it, provided that your computer must be wired, that is to say, your computer must have an IP address. ok？？？

The campus network uses the router as a switch: all network cables can be connected to the LAN port of the router.

First of all, the WAN port should be vacated, and all the wiring should be connected to the LAN port.

Disable the DHCP service for Route B.

Manually set each computer to different IP to try it out.

LAN 2 port configuration:

LAN 3 port configuration:

LAN 4 port configuration:

The early stage is to turn off DHCP. Thank you.

Use the WAN port But enter the router and change the LAN to get it from the previous to Anyway, my router is changed This doesn't matter

Configure the computer IP to be automatically obtained, and connect the incoming line to the WAN port of the router (indicated on the router); Find another network cable plugged into the LAN port (marked on the router) at one end and plugged into the computer at the other end;

1. Log in to the router (for TP-Link routers: turn on your computer, click on IE browser, enter in the address bar: press enter, pop up the login page and enter the username "admin", password "admin", please refer to the router user manual for other routers);

2. Click on the network settings on the left, select PPPoe in the WAN port settings, enter the username and password given by the operator (if you don't know, call broadband customer service), and enter the DNS address (you can check your local DNS address on the Internet);

3. Turn on the DHCP server;

4. For the wireless router, turn on the wireless network, turn on the wireless network function, and set the wireless login password (security option wpa-psk wpa2-psk, enter the key);

Save the parameters and it's OK,At this time, the desktop has been able to wired the Internet,Then open the wireless network card in the right corner of the desktop and right-click to view the available wireless network,Now your router broadcasts the signal,Double-click to connect,Enter the key to get it。 Wired and wireless access is available.

Configure the IP on the computer to automatically obtain, and in the future, you can go to the Internet by opening the browser directly on the desktop, and finally connect the computer to the network (wired and wireless access are available) to check whether you can access the Internet normally.

If you can't access the Internet, you can only connect to the computer that can access the Internet normally after dialing up the link on the router, log in to the router again, and clone the MAC address in the WAN port settings, and you're OK.

To set up IP Internet access, you need to fill in the gateway address if your router Internet access mode is dynamic, and the router needs to fill in the gateway address. These are the same as when you go online on your computer, and this one is ready to go online.

If it still doesn't work, it may be that the route is restricted, and the solution is to use MAC address cloning, which is generally available in routers. Because the last time the router was identified by the MAC address, the MAC address of different types of devices is differentiated, and after cloning, the upper-level device thinks that the host is connecting to it.

That's almost OK, if not, please ask.

Campus network, your wireless router, as long as the wireless part of the setting is done, and then turn off the DHCP function on the router, connect a wire to the LAN port of the wireless router on the switch, you can use WiFi directly...

It can be used, but the access IP of the route should be changed and not used, otherwise it may conflict with the main route of the school and cause a broadcast storm.