LAN disconnection problem urgent! 15

First, troubleshoot the hardware and route the modem switch first. In particular, the current modem route takes a long time and is not stable. If there is no problem with the hardware, check for software failures.

Second, for software, the first thing to check is whether the computer in the LAN is using a virus, resulting in the instability of the entire network. The second is to manually set up the IP and DNS. Generally, it is OK to set up the DNS and default gateways.

3. Use one computer to make a dual-network card server, don't use other computers, install a software called sygate on the server, and you can see the line chart sent and received. You can determine whether it is an ISP problem.

It may be your TDE switch, and the switch also needs to distribute IP to the following. It may be that when you connect to TDE, its DHCP function conflicts with the DHCP function of the router, and everyone goes to TDE to get the IP address, but TDE does not have the routing function required to access the Internet, so everyone is disconnected.

There may also be ARP attacks on the intranet.

ARP stands for Address Resolution Protocol, which enables you to know your physical address through your IP address. Hackers modify ARP data packets according to its principle, so that the physical address of other machines or fake physical addresses obtained through the IP is obtained, resulting in other machines intercepting data or data cannot be sent at all, which is ARP spoofing.

At present, most of the problems in dealing with ARP spoofing are that the gateway and the terminal bind the IP and MAC addresses in both directions, and then install the ARP firewall on the terminal, but this does not completely solve the ARP problem.

First, some ARP Trojans modify your MAC address before your ARP firewall is running, so that the IP MAC bound to the ARP firewall is incorrect. Make your ARP firewall a great one.

Second, it cannot prevent some people in the LAN from maliciously attacking other machines, or using some software to control other machines, such as P2P terminators, Jusheng network management and other software. The LAN is flooded with a large number of ARP packets, resulting in network latency, packet loss and other problems.

At present, the most complete solution to the ARP problem on the market is the Xinxiang Immune Wall Router, which has a unique immune network solution that can completely solve the ARP attack problem. Xinxiang's immune wall router has the function of innate immunity, which fuses the NAT table and the ARP table through the modification of the protocol, and directly queries the NAT table when there is an ARP request, making the deception against the gateway ARP table completely ineffective. The terminal is equipped with an immune network card driver, which can directly read the MAC address burned on the network card to ensure that it is correct.

Filter malicious ARP packets as well as other common flood attacks to keep your network open.

Please use xclient. This is easy to use and does not drop the line, and it is easy to drop the line.

1. Other users use P2P software and affect your Internet speed;

2. The quality of the network cable and the connection method of the crystal head are not good, which leads to the instability of your network;

3. Electromagnetic interference.

It is recommended that you: 1. Reduce the length of the network cable;

2. Replace the crystal head;

3. Try to change the wiring method: for example, change the previous wiring along the top of the wall to the corner of the wall, etc.

After dropping the line, do you have to see if the adsl on the cat is also flashing, if so, it is a line problem, you can call ** to find the operator!

I think it's better to pay attention to antivirus, and most antivirus software has become an ornament nowadays.

Free stuff, after all, it's not worry-free.

It's clear that your network is being siphoned off by someone else.

It is recommended to troubleshoot internal problems in the local area network.

1.Test the reason for the external line Test method: connect a single computer to test whether the line is stable.

2.Network bandwidth is maliciously preempted Generally, if the bandwidth is not occupied, it will only feel that the network speed is very slow and will not be dropped, although it is unlikely, but it is not ruled out.

2.You said that it would be good to restart the router, but it won't work for a while, and it's obvious that there is an attack that causes the router to crash or block.

4.In fact, 80% of cyber attacks come from intranets, and extranet attacks are not uncommon, but they are very unlikely.

Solutions to Intranet Attacks and Bandwidth Preemption:

1. On the computer you can't access, take a look at arp -a to see if the MAC and IP address obtained are the same as the gateway MAC and IP, and whether it contains an IP address of 255 or an address with a MAC address of 00 FF.

2. If the above phenomenon occurs, you should check the corresponding MAC or IP machine, or find out the initiation by grabbing packets.

IP address of the ARP attack

3. Find the source of the attack through some ARP inspection tools, and update the virus database first after finding out, if the antivirus fails, you can only redo the system (the machine that sends ARP may not be able to access the network).

The main reason for the above-mentioned intranet attacks is due to the existence of protocol vulnerabilities and poor management at the bottom of the Ethernet network, and it is certainly not possible to solve this problem by hardware alone I heard that the use of the patrol immune network solution to upgrade the existing ordinary network to the "immune network" can fundamentally solve this problem, it is recommended that you search the Internet for devices that can manage intranet terminals...

Overloaded? You should consult an expert, this is something that involves most of the city.

The line problem is relatively big, and there is also your transmission distance is too far, and the signal becomes weak.