Analysis of the reasons for intermittent LAN and LAN disconnection

There are many reasons for the intermittent LAN, the first check the network cable and the crystal head, if there is no problem with the network cable and the crystal head, then the check of the network card is not a problem That is where the LAN network speed is very poor At the same time, the LAN where you are has other people using **device for a long time** thing. If it's all normal, then I can't help it, you still check it.

If a computer is connected to the local area network, if there is a problem that cannot connect to the network, there are usually many reasons that cause it to fail to connect normally, we must troubleshoot one by one, find out the problem, and then start to solve the problem. Here's what I've compiled for you on how to disconnect from a LAN, let's take a look!

When the computer cannot connect to the network normally, the first thing you need to do is to make sure that the network card driver is installed normally.

The specific detection method is to open the Run dialog box and enter the command cmd to enter the MSDOS interface.

Then, in the pop-up msdos interface, enter the command "ping", if the loss rate is 0, it means that the NIC driver is installed normally. Otherwise, you will need to reinstall the NIC driver.

Then we also need to make sure that the machine is correctly assigned an IP address. In the MSDOS interface, enter the command "ipcong" to get the local IP address. If it exists, the local IP address is assigned normally, otherwise you need to manually set the IP address or set the IP allocation mode to DHCP mode on the router management page.

See below for details on how to set the router IP assignment method to DHCP.

Determine whether the machine has established a physical link with the router normally

Q: Recently, my computer has been disconnected a lot, I think it is an ARP virus, and I installed the ARP firewall, but the ARP firewall does not detect the attack, but I still get disconnected (disconnected)?

Answer: There are several reasons for this:

1.It is possible that the attacker only sent an ARP attack packet to the gateway, so the ARP firewall did not detect the attack. Solution: It is recommended that the user set the "Active Defense" function to "Always Run" and set the defense speed to: 100.

Before the firewall is started, the machine is already under attack, and the gateway MAC address automatically obtained by the ARP firewall is fake. Solution: Consult the NMS to obtain the correct MAC address of the gateway, and then manually set the IP address of the gateway in ARP Firewall.

3.If the above two boring guessing methods are not feasible, then it is estimated that the reason for the disconnection has nothing to do with the ARP attack, after all, there are many reasons for the disconnection, such as: hardware problems, line town section road problems, problems with the Ant Brigade application (such as games) itself, etc.

1. When intermittent network disconnection occurs, it is generally necessary to find the problem from the network cable, crystal header, router, configuration, etc. according to the information provided on the Internet, and no matter how you look for it, you will find that restarting the router can last for a period of time until the next drop, and then the router cannot be automatically connected, and you still need to restart the router to continue surfing the Internet.

2. Many times people who understand that they will use the computer to connect directly, and do not use the router to test whether the network is normal. At this point, the problem arises, and the original broadband connection becomes a broadband connection2.

3. Then go to the control panel Network and Interent network settings, and find that 2 broadband connections appear.

4. Delete these 2 broadband connections at this time, and then reconnect the router, and everything will be back to normal.