How to solve no line by the failure of the Internet

One, no line from the reason for not surfing

In a normal internet, ADSL moderm and wireless router suddenly power off, restart after the notebook can not find wireless network, can not surf the Internet, this is where the problem? Due to the Internet when the network device unexpected power failure occurred, so the result is that the fault may be in the ADSL Moderm or on a wireless router.

In order to determine the breakdown of the specific device, the first ADSL moderm directly to the notebook, dial-up notebook can be connected with the network, but also stable operation, so the problem should be out of the wireless router.

I am using a tp-link wr541g wireless router, peacetime use is still stable, and once also encountered a router suddenly power off the situation, there is nothing unusual, will this power outage on the router hardware damage?

Pick up the router carefully observed, did not find that the local temperature is too high, also did not smell the odor, the appearance does not see anything unusual. Connect the ADSL moderm and wireless router to reboot, the wireless network card on the laptop prompts to discover the network and connect normally. Check the network, found that the normal Internet, network failure seems to suddenly automatically disappeared. But the duration is not long, wireless network card suddenly prompted not to find the Internet, how can this be?

Just as I am still thinking about where the problem may be, the network card also prompts the discovery of the Internet, but not last a minute, and prompted the network can not find, so repeated. Is there a problem with the NIC on the laptop? Restart the computer, the fault remains.

The problem seems to become very complicated at once, from the beginning of the suspected ADSL moderm to the router to the laptop card, the author has not found the exact cause of the problem. So what exactly is the problem?

Second, no Line by fault analysis

Silently review the whole process of fault phenomenon, and combine to start to do test, the author can come to the following clear information:

1, ADSL moderm directly connected in the notebook can be normal Internet, indicating ADSL moderm and notebook integrated network card should be normal.

2, the use of wireless network card through the router is not normal, indicating that our problems may be in the wireless network card or router. Based on the above information, you can design the following processing plan:

The integrated network card on the notebook connected to the wireless router, ADSL moderm, to see whether the Internet is normal. If normal, it means that the fault is on the wireless card of the notebook, otherwise the problem should be on the wireless router.

The relevant equipment connected properly after the start, the network appears normal, however, the duration is not long, network prompts can not connect, fault recurrence. Now we can conclude that the problem should be on the wireless router. So what happened to the wireless router?

Looking at the router carefully, I was surprised to find that when the ADSL DSL led indicates that the network was connected for about half a minute, the router's LAN port led suddenly flashed together, and then the system led flashed, showing that the route was automatically restarted. What the hell is wrong with the router?

According to the previous test results, we found that whether the integrated network card or wireless network card will appear the same fault phenomenon, and two network cards connected to the net need to go through the link only the WLAN port and ADSL router moderm, but ADSL moderm normal, The problem is further narrowed down to the WLAN port on the router.

In order to confirm the above inference, the author will adsl moderm and router disconnect, and then connect the computer with the router, found that no matter whether the integrated network card or wireless network card will not appear before the start of the fault phenomenon, so you can determine the router's WLAN port problem.

It seems that the problem has been found, but then there will be a headache. How do we deal with it? This router has only one WLAN port, and if the only WLAN port is broken, the router will only be reimbursed. It seems to have forced himself into a "dead-end".

Third, upgrade software problem solving

Remove the router carefully look at the WLAN port, no smell, local temperature is normal, try to plug in the network, the card mouth contact good, no abnormal physical damage or physical connection abnormalities. At this point in my mind flashed an idea: Will it be the software to control the WLAN port problems? After the wireless router is initialized and reconfigured, the symptom disappears.

The problem seems simple to solve, but it takes a lot of effort to analyze and judge the problem. Summarizing the process of troubleshooting can be found, this is a typical router control software bugs caused by network failure. The characteristic of this kind of problem is that the fault phenomenon is caused by some unexpected factors and the performance is different, and has a strong confusion.

In this example, the author has also encountered a sudden failure of the router, but there is no fault, so the network fault caused by such factors is easily overlooked.

No matter what brand of wireless routers are more or less in the previous design process retained technical defects, that is, often said control software bugs, which makes such factors caused by the fault is very common. This kind of problem must be upgraded from a fundamental solution to upgrade the software for this router, and sometimes it may be multiple upgrades.

There are many kinds of fault-free circuit, when you encounter wireless network failure and can not be the usual way of thinking analysis and processing, try to upgrade the software analysis to see if it can help solve the problem.