WiFi analyzer (# Android # mobile phone version ))

Http://delxu.wordpress.com/2011/03/13/wifi-analyzer-android%E6%89%8B%E6%9C%BA%E7%89%88/

WiFi analyzer (# Android # mobile phone version) posted on 2011/03/13 by delxu

Original delxu document. For more information, see the source. Thank you!

A new HTC Desire HD mobile phone has been launched over the past few days. It's a great WiFi tool and I can't help but share it with you.

WiFi analyzer (# Android # mobile phone version)
Download link
Https://market.android.com/details? Id = com. farproc. Wifi. Analyzer

What's the use of this stuff?
First, it can be used to search for nearby Wi-Fi signals. (This function is available in many apps, such as Wi-Fi manager or Wi-Fi manager. However, this software can display detailed information such as signal strength, channel, encryption mode, and MAC address, which is very powerful .)
Secondly, it can be used to determine the channels used by nearby Wi-Fi base stations, so as to correctly set the channels of their home WiFi devices to avoid signal conflicts and improve network performance.
Finally, it helps the company's network administrator capture illegal Wi-Fi base stations.

How can this problem be achieved?

This viewListLists the SSID, Mac, channel, encryption mode, and signal strength of nearby wireless hotspots. The signal strength is expressed in dBm. The larger the number (because it is a negative number, the-50 value is greater than-80) indicates the stronger the signal.

The preceding viewIn chart ModeStraight
It shows the overlapping channels of various Wi-Fi hotspots. Wi-Fi channel from Channel 1 to channel
14. Signals occupy different spectrum ranges. signals of the same channel completely overlap. Signals of adjacent channels partially overlap. The span of each signal is about five channels. If the spectrum range of the two signals is heavy
Stacked, two signals will interfere with each other, resulting in a decline in the signal quality. The intuitive feeling is that the speed slows down. Full overlap causes severe interference, while partial overlap causes partial interference.

The adjacent channels do not completely overlap, but some overlap may also cause some interference. Generally, five channels are separated to avoid mutual interference. Even if it is not possible to completely overlap, we should try to minimize the overlap of the spectrum. If you want to add a new WiFi launch source, we recommend that you set it to Channel 10 or 11.

When you buy a new Wireless Broadband Router for the first time, we recommend that you first check the channels occupied by the Wi-Fi signals of your neighbors to avoid overlapping spectrum. Generally, the default settings of wireless routers of the same brand are the same. If you do not change the channel, your router may use the same channel as the neighbor's, thus interfering with each other.

This view shows the signal strength changes.

When you approach a Wi-Fi signal source, the signal gets stronger, and vice versa.

Sometimes, unconscious employees bring WiFi from home
The AP or Wi-Fi router is connected to the company's network interface, which causes interference to the company's wireless network, and even brings security risks to the company's network. Because illegal users may access through this wireless signal
To the company network. As the company's network administrator, we must eliminate this situation. Our duty is to find and capture this security risk. How to do it? You can use this tool. Start your android
The phone opened the app and walked around in the company. When the signal strength reached or even exceeded-40dbm, the illegal WiFi source was almost within one meter.

This app is no longer suitable for the network management of ordinary companies, because in general, non-wireless network engineering integrators will not spend thousands of dollars to buy a professional handheld fluke wireless signal tester.

Original delxu document. For more information, see the source. Thank you!