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Knowledge Base

Part of the user’s notebook which use wlan can't surf the Internet

Publication Date:  2012-10-08  |   Views:  1048  |   Downloads:  0  |   Author:  SU1000722738  |   Document ID:  EKB1000016739


Issue Description

Notebook correlated AP appears signal unstable and is unable to connect to the Internet or be restricted.

Alarm Information


Handling Process

Check and deal with the problem according to the reasons which may cause laptop users can't access internet or connection limited: 
1, view physical links and find links are normal;
2, use other notebook connect AP can access internet normally, so can eliminate AP and notebook itself problem;
3, test AP signal intensity through the WirelessMon tool, in - 55 db or so, belongs to the normal threshold value range of the signal intensity, in addition, scanning the environment signal distribution, peripheral other co-channel AP strength are below -80 db, to ensure that no obvious disturbance;
4. Check the POE exchange ground are correct, the power supply voltage has no abnormalities, eliminate voltage instability causes;
5, finally through the wireless capture network card capture and analysis message in lip side, check the terminal MAC address in the AP hasn’t aging away, resulting in terminal can’t realize message normal interaction when associated AP again. For new bg's WA601 type of AP equipment, currently used V1R3C01SPC300 version exists the problem the terminal MAC address in the AP can’t aging, can through restart AP to avoid temporarily, upgrades the new bg's AP to version v100r003c02spc100 can fundamentally solve this problem.

Root Cause

Preliminary judgment according to the situation, the reasons that cause some laptop users can't access the internet or connection limited are as following:
1, Physical link connection problems lead to AP signal appears fluctuation;
2, AP or notebook itself product hardware problem;
3, AP signal strength is not within the scope of threshold value or exist signal interference,
4, POE power supply switch power supply is not stable lead to AP voltage abnormal and signal unstable.


When encounter the question that some individual user’s notebook can’t access internet normally in the network maintenance process, can be attention to see whether the AP equipment is a new bg or old bg in fault location. If it is the new bg, then check whether the software version is upgrade to the latest version, if not, it is suggested upgrade the AP software version.