The network speed suddenly slowed down. Is it normal after restarting the route?

1. Operator Line Problem

Sometimes the slow network speed is not the problem of the network itself, but the problem of the operator's line. If you can't find the problem inside the network, it is recommended to call the broadband operator.

2. Bad network cable contact or switch hardware reasons.

Poor network cable contact or switch hardware may also cause the network speed to slow down. This problem can be judged by "Ping" gateway. If the delay of ping gateway is high, it is basically due to hardware reasons or poor contact.

3.P2P software takes up too much bandwidth

P2P software such as Thunder and BT and online video will take up a lot of bandwidth. Therefore, when we detect the reason of slow network speed, we should make sure whether anyone in the local area network uses P2P software to download and whether there is online video.

It is best to use traffic monitoring tools, such as wfilter and wireshark, to judge such problems.

4.ARP virus and worm virus

When the Trojan virus spoofed by ARP breaks out, it will send out a large number of data packets, which will lead to the congestion of local area network communication, and users will feel that the internet speed is getting slower and slower, which will make the local area network almost paralyzed. So be sure to upgrade antivirus software in time; Computers should also upgrade and install system vulnerability patches in time, while uninstalling unnecessary services and closing unnecessary ports; Install ARP firewall to improve the security and reliability of the system. At the same time, some worms can also slow down the network.

5. Unreasonable network division leads to broadcast storm.

In order to improve communication efficiency, effectively prevent some important parts of the LAN from being attacked and protect sensitive data, we can divide a large number of VLANs. Because the communication between VLANs must rely on Layer 3 devices, it is impossible to broadcast between VLANs, so the broadcast storm will be limited to a VALN. Thus, in the local area network, properly dividing VLAN is not only conducive to improving communication efficiency and network security, but also effectively improving the stability of the network, so that the damage of one or several devices will not affect the normal communication of the whole network.