Is there a virus that can affect the LAN speed?

Some viruses can affect the speed of the local area network, such as Nimda, the cover letter virus and its variants, and many other network viruses can cause the speed to slow down. If one computer is infected with these viruses, they can spread to other computers over a local area network or the Internet. The entire network is flooded with virus files, clogging the network and increasing the load on the server or client computer.

All of these factors can lead to a decrease in internet speed.

For example, the cover letter virus that just went viral a while ago. Users can already be infected by previewing the virus message without executing any attachments. Once a user is poisoned, the virus will send a large number of e-mails to the recipients of the address book, causing increased load on the server and client, and causing network congestion.

Normal data frames cannot be transmitted, and even the entire network is paralyzed.

In order to prevent the interference of viruses, network maintenance personnel need to regularly check for viruses and anti-viruses, set up network firewalls, and modify various vulnerabilities. When a computer is poisoned, disconnect it from the network to prevent infection of other computers.

Some viruses are randomly sent packets in the local area network, resulting in an abnormally slow network speed, and the solution can only quickly find out the source of the virus, and then quickly isolate and deal with it!

There should be such a virus, but according to what you said, I personally think it may be that telecom has not done a good job for you.

You can discuss it, turn off the computer one by one, and take a look at the rest of the Internet situation.

Or see if other users are running bandwidth-intensive software...

Is the landlord trying to disrupt people's Internet speed?

10 households use 1 8m broadband and the highest can only reach 150k to change to a broadband.

But in the end, it's 8m, how can the highest is only 150?

In addition, the optimization of the machine will help you improve your network speed :)

Hello, this situation should be your next door cracked your wireless password, he is also using your network at the same time, and occupying your network speed, is your network fluctuating. You can install PC Manager, go to the toolbox and select Wireless Security Assistant to protect your network from being used by others.

Hello! If the computer on the same LAN is infected with the ARP virus, the LAN will be abnormal.

It is recommended to use anti-virus software to completely kill that computer.

The other party may have opened LAN speed limiting software, you can install an ARP firewall to try.

There are many types of viruses, and different viruses behave differently, and some viruses will affect the network speed, but it is not caused by the slow network speed or the virus. If you suspect a virus, you can install a monitored antivirus software to completely eliminate the virus.

Viruses are also functionally positioned differently, for the sake of safety, the general user does not want to bare metal, and must use a 360 or other anti-software to protect the computer.

Common viruses don't necessarily, depending on what virus, such as a robot dog or something like nb fancy will be infected My computer is often infected by others It's annoying Not all viruses will affect the speed of the network, b

If the computer is poisoned, there will be a slowdown in the network speed, stuck, crash, blue screen, number theft and other serious endangerment of computer security, you can use 360 antivirus software to scan the whole disk, if it still does not work, use the 360 system first aid kit! It's best to reboot and keep pressing F8 to enter safe mode for antivirus, happy friends.

In general, worms affect speed.

Some viruses will affect the speed of the network, but some will damage the system, no matter from that aspect, it is recommended that you still have to do a good job of defense can not let the computer in the virus, at present, relatively speaking, 360 antivirus is relatively easy to use, it is permanently free to install, easy to operate, occupies a small memory, and the anti-virus ability is also strong, now 360 anti-virus it has five leading anti-virus engine engines, the five major anti-virus engines are embedded in the anti-killing system like a "blade", and there is no dead end in the sharp anti-virus engine. It provides the system with full-time comprehensive virus protection, which not only has excellent detection and killing capabilities, but also can defend against new virus Trojans in the first time.

Depends on what viruses are, and some Trojans will.

I just saw it, and I didn't dare to say it, because the ARP virus seems to be on the intranet and not on the extranet.

LAN is available and this is a vulnerability in the system.

When a computer in the local area network runs this kind of ARP spoofing Trojan, other users who used to access the Internet directly through the router now switch to the Internet through the virus host, and the user will be disconnected once when switching.

Because the ARP spoofing Trojan will send out a large number of packets when it occurs, causing LAN communication congestion, users will feel that the Internet speed is getting slower and slower. When the Trojan stops running, the user will resume surfing the Internet from the router, and the user will be disconnected again during the switch.

As soon as the machine is turned on to access the Internet, it will continuously send ARP spoofing packets, that is, it will send ARP packets to other machines in the same subnet with the fake physical address of the network card, and even deceive other machines by impersonating the physical address of the subnet gateway, so that other machines in the network will access the Internet through the virus host, and other machines will be disconnected from the network once in the process of switching from the real gateway to the fake gateway. If the virus machine suddenly shuts down or goes offline, the other machines will have to search for the real gateway again, and the network will be disconnected again. Therefore, as long as there is one or more such virus machines in a certain subnet, it will make other people's Internet access intermittent, and in serious cases, the entire network will be paralyzed.

In addition to affecting others on the Internet, this virus (Trojan) also aims to steal the user account and password (such as QQ and online game accounts and passwords) on the virus machine and other machines in the same subnet, and it sends ARP packets, which has a certain degree of secrecy, if it does not occupy a large system resource, and there is no anti-virus software monitoring, it is not easy for ordinary users to detect. The virus, which mainly occurred in student dormitories at the beginning of the school year, has been spreading to office areas and faculty housing areas according to recent investigations, and is becoming more and more intense.

ARP virus, which is a general term for a class of viruses. Borrowing the ARP protocol to defraud and poison the computer in the local area network and then drop the connection. It is recommended to install the ARP firewall to check the virus of the computers on the global area network.

There are a lot of software like this.

For example, common skulls, ARP, DDoS, etc. can be used, and similar things are not unpreventable.

A lot of companies are using the Xinxiang Immunity Wall to upgrade the normal network to the immune network, and this kind of problem does not exist.

QQ uses the security center, and Want Want uses mobile phone binding, so you are no longer afraid of being stolen and use it with confidence.

To prevent the spread of viruses, you can use antivirus software to automatically clean up the entire disk after scanning, and then shut down the computer and scan again.

Antivirus software can be used 360 antivirus or poison bully, etc.

We all know that in a local area network, the spread of viruses is very rapid. Especially cyber viruses. Why can't I completely remove a network virus with a stand-alone version?

The main reason is that network viruses have their own unique network characteristics. At present, there is no standard concept of network viruses, but viruses that can spread within a local area network are collectively referred to as network viruses. In the network environment, in addition to the commonality of computer viruses such as transmissibility, executability, and destructiveness, network viruses also have some new characteristics

1. Fast infection speed: In a single-machine environment, the virus can only be brought from one computer to another through a floppy disk, while in the network, it can spread rapidly through the network communication mechanism. According to the measurement, in the normal use of a typical PC network, as long as there is a virus in one workstation, it can infect all hundreds of computers on the network within tens of minutes.

2. Wide diffusion: Because the virus spreads very quickly in the network, the spread range is very large, not only can quickly infect all computers in the local area network, but also spread the virus to thousands of miles away in an instant through remote workstations.

4. It is difficult to completely remove: computer viruses on a single machine can sometimes be deleted by deleting toxic files. Measures such as low-level formatting of hard disks can completely remove viruses, and as long as one workstation in the network fails to disinfect, the entire network can be re-infected by viruses, and even a workstation that has just completed the removal work may be infected by another workstation with poison on the network.

Therefore, virus removal on workstations alone cannot solve the harm of viruses to the network.

5. Destructive: The virus on the network will directly affect the work of the network, reduce the speed and affect the work efficiency, and collapse the network, destroy the server information, and destroy the work for many years.

6. Excitability: The conditions for network virus activation are diverse, which can be the internal clock, the date and username of the manuscript, or the communication of the network. A virus program can be fired and attacked on a workstation at the request of the virus designer.

7. Potentiality; Once a network is infected with a virus, even if the virus has been removed, the potential danger is enormous. According to statistics, after the virus is cleared on the network, 85% of the network will be reinfected within 30 days.