Solution to unstable wireless Internet access

Wireless Network instability often affects a big problem. Sometimes it may even cause immeasurable trouble. How can we solve this problem? What is wireless roaming? Here we will introduce you.

The wireless Nic indicator shows that you are looking for a wireless network (in fact, the original wireless signal still exists at this time ). After about one minute, the wireless network was connected again. However, the wireless client is still connected to the wireless router that was last connected. That is to say, the network disconnection time in the middle of one minute is white. Don't underestimate this minute. Sometimes it will cause great losses. If the employee may be sending files with the customer, and the resumable data transfer function is not available, it will mean a new one. If someone is playing a game, it may be killed by others because of the network disconnection. Since the wireless client cannot find a better wireless signal than the original one, and the use of the existing signal can still access the Internet, it is only a little slower. In this case, why is the wireless client still changing? To say something ugly, you just eat it in a bowl and look at it in the pot. How can we avoid this phenomenon? This starts with wireless roaming.

Unstable wireless networks-features of wireless roaming

Two wireless routers constitute two cells. When A wireless client moves from position A to position B, the wireless signal sent from the wireless router on the left is A process from weak to strong, and then from strong to weak. Even though the wireless router on the Left can still access the Internet at the point B, the signal is weak. In this case, the wireless client may search for other available wireless signals. It is best to search for the wireless router on the right, but because its signal is not as good as that of the wireless router on the left, the client finally decided to use the wireless router on the left. However, it may take 30 to 60 seconds for the intermediate wireless client to search for new wireless signals. Worst of all, the original wireless network will also be disconnected during the search process.

In fact, we watch TV. When a TV series finishes playing the next episode, we may change the channel to allow the TV to search for new programs. Then, wait until the very beginning and switch back. However, in this process, the audience will omit the introduction of the next episode. It is also possible that the starting part of the next set is missing when the rollback is too late. This is the price the audience will pay when watching TV. The main reason is that each TV channel has a different frequency, and the TV can only receive one frequency signal at the same time. For this reason, the audience can only watch one TV program at the same time.

This is also the case when the wireless client searches for new wireless signals. When the original signal is still available, it will take the initiative to search for new signals. In this search process, the original wireless network will become unavailable, resulting in a short network disconnection. This is exactly the price that the wireless client must pay when the new and old signals are not timed. Can this phenomenon be avoided?

Active and passive scans for unstable wireless networks:

Before talking about this solution, the network administrators should first eliminate a misunderstanding. Who controls the wireless roaming process? As shown in, does a wireless router control the roaming process of the entire client or does the client decide whether to roam? I was misled when I first started to access wireless networks. I thought it was a wireless router that determined whether to roam. In fact, not only the author, but many network administrators still have misunderstandings in this regard. At that time, I can tell you responsibly that the roaming process of the wireless client is completely controlled by the driver of the wireless client, and has nothing to do with the wireless router or the wireless signal transmitting point. To this end, we can avoid the client-side swing during wireless Internet access. We also need to check whether the wireless network card used by the client supports this function.

As shown in, when the wireless client moves from location A to location B, the signal of the wireless router from the left is decreased. To a certain extent (the wireless signal can still be used to access the Internet, but the speed is a little slower), different wireless network adapters or wireless signal receivers will have different practices. For example, some clients will search for other adjacent wireless routers at this time, while some clients will not search, and will only search if the original signal is unavailable. For this reason, the former processing method may easily cause the situation described at the beginning of the article. Because the wireless client may stay at location B for a long time. In this process, if the wireless client searches every few minutes to see if there is a better wireless router. The client's network connection will be resumed in a time period, which will cause a lot of trouble for employees to access the Internet. To this end, the network administrator should try to avoid this situation.

In addition, even if the second method is used, the network administrator should try to shorten the search time to reduce the network disconnection time. You may find a strange situation. The time needed to search for wireless network signals in the same location varies depending on the configurations of the wireless network adapter. A short value can be 10 seconds, while a long value can be 100 seconds or even longer. This is related to the configuration of the wireless client, but also to the scanning method of the client. After the wireless client determines that it needs to be roaming, the client first needs to search for the wireless router of the potential message, which is mainly achieved by searching for other channels to find other active wireless routers. Generally, there are two main scanning methods: Active scanning and passive scanning. Active scanning means that the client takes some time to scan other channels and sends probe request frames to query available wireless routers. Passive scanning also takes some time to scan other channels, but only listens without automatically generating probe request frames. That is to say, if the wireless client uses the passive scan method, you only need to wait for receiving the beacon.