Why does one line of three computers sometimes drop

When it falls, ping the gateway to see if it can be pinged, use arp -a to see if the MAC corresponding to the IP is the MAC of the router, if it is not possible to be attacked by ARP, ARP deception is divided into two types, one is the deception of the router ARP table; The other is gateway spoofing for intranet PCs.

The first type of ARP spoofing works – intercepting gateway data. It notifies the router of a series of wrong intranet MAC addresses, and continuously proceeds according to a certain frequency, so that the real address information cannot be saved in the router by updating, and as a result, all the data of the router can only be sent to the wrong MAC address, causing the normal PC to not receive the information.

The second type of ARP spoofing works – fake gateways. It works by setting up a fake gateway and letting the PC tricked by it send data to the fake gateway instead of surfing the Internet through a normal router. In the eyes of the PC, it is just that it can't be connected to the Internet, and "the network is disconnected".

The usual solution is:

1. In the broadband router, input the IP-MAC of all PCs into a static table, which is called router IP-MAC binding. 2. Set the static ARP information of the gateway on all PCs on the intranet, which is called PC IP-MAC binding. The third is a combination of the first two methods, which is called IP-MAC two-way binding.

The method is effective, but the work is tedious and the management is cumbersome. Binding each PC is already laborious, and it is even more painful to add, maintain, and manage such a long list of router items. Once the capacity is expanded and adjusted in the future, or the network card is replaced, it is easy to cause confusion due to negligence.

In addition, there are new variants of ARP, and the second-generation ARP attacks have the ability to automatically propagate, and the existing macro file binding method has been broken, which is mainly manifested in the spread of viruses through network access or inter-host access. Since the virus has infected the computer host, it can easily remove the ARP static binding on the client computer, with the cancellation of the binding, the wrong gateway IP and MAC correspondence can be smoothly written to the client computer, the wrong gateway IP and MAC correspondence can be smoothly written to the client computer, ARP attack is unimpeded again.

Now they are using immunity walls, and they have security functions for each node in the network through source suppression, group prevention and control, and network-wide linkage, and can call various security resources to respond to attacks when facing attacks, and can also accurately find the source of attacks through system monitoring and deal with them in a timely manner.

It may be that the router has been used for a long time, please turn off the router and modem appropriately. And clean up the dust.

Too crowded"Finish! With three knots and two sets! Much better!

First, ADSL

Failure of the modem or splitter. adsl

Problems with the quality of the modem or separator will cause frequent dropouts. It is recommended to borrow a set of equipment that can be used normally, and replace it before testing.

Second, the ADSL line is faulty. The residence is far away from the local computer room (usually less than 3000 meters), or there are serious interference sources near the line, which will also lead to frequent dropouts. Also, in the junction box to the ADSL

It is recommended to use twisted pair wires between modems, and even if parallel wires are used, they should not exceed 5 meters.

Third, indoor electromagnetic interference. Indoor electromagnetic interference is more serious (such as cordless**, air conditioners, washing machines, refrigerators) and may also cause communication failures, it is recommended to make ADSL

The modem is away from and does not share a power cord with the above devices.

Fourth, the network card is defective. Defective network card quality, or driver mismatch with the version of the operating system, can also lead to frequent disconnections.

Fifth, the PPPoE issue. This is a problem caused by unreasonable installation of PPPoE software in the system or poor software compatibility. In general, Windows

XP recommends using the PPPoE protocol and dialer provided by the system itself. windows

98 2000 can install the PPPoE dialer that comes with the modem. We recommend that you install system security patches first.

In addition to this, ADSL should also be confirmed

The modem dissipates heat well.

Hello, you said that this situation is generally caused by carrier lines, cats, routers, etc.

1 The cat has been left open for a long time, it is very hot and hot, it is recommended to place the cat in a ventilated place as much as possible, and do not overlap with the router. so as not to overheath the temperature. It's really not good to recommend changing a cat with good performance (I hit ** to go to telecom, free to change).

2 Several computers share the network, because the router is too poor, others use P2P to watch movies, etc., it will drag the router to death, restart the router will be better, the long-term solution is to change to a better enterprise-level router.

3. The operator's computer room is far away from your home, beyond the ADSL distance, line failure, etc., then ask them to measure the signal strength and line situation (sometimes two lines, one can be connected to the Internet if one is broken, but the network speed is slow, easy to drop, ordinary people can't find it).

Please find the problem from the above points, I hope it can help you!!

I don't understand hi I !!

Set different IPs otherwise there may be conflicts.

There is a high probability that it is an IP address conflict.

If a computer is poisoned, it will drop.

It's the fiber optic cable that's wrong, and mine was the same before.

First of all, please absolutely rule out viruses or Trojan horses, and free antivirus software is not recommended. Kaspersky is recommended.

If there is, it is a problem with the virus, after the anti-virus observation, it is recommended to redo the system and completely format the hard disk.

If Brother Li doesn't, the first thing to check is your system installation disk, all you have to do is to change it, and now almost all of them are pirated versions. Oh, everyone's pirated disk is different, please use the traditional installation method, ghost is not recommended. It is highly recommended to install a clean system, that is, after installation, there is only one operating system in the computer, and there is no software other than Windows.

If it doesn't work, please check the network card driver first, go to the latest network card driver, and if it is an integrated network card, go to update the motherboard driver. If the PCI network card is not working, you can consider changing the slot if the driver is not working.

If it still doesn't work, please check whether the RJ45 connector of the network cable and the router is a B-type cross-connection method (PC-to-switch connection method) Please have a detailed description in "Two Connection Methods of RJ45 Connectors". It can be compared. Try swapping the network cables of the two computers.

Try replacing the socket on your router.

The first IP and the second IP

Gateway IP (X is the number in your router's actual IP address).

Subnet Mask: Default.

That's all I've thought of for you, and you should be able to figure out the problem with elimination.

Personally, my biggest suspicion is that you have a system problem, please use a clean system installation disk to install it with the traditional installation method.