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6.4.2. Wireless Performance Issues

IssueCauseSolution
InterferenceNon-Wi-Fi sources on the same frequencies (microwave ovens, Bluetooth, cordless phones in 2.4 GHz) or neighboring networks crowding your channelsChange channel, use 5 GHz
DistanceToo far from APAdd APs, increase power
AbsorptionWalls, furniture blocking signalReposition AP, add APs
OvercapacityToo many clients per APAdd APs, balance load
Co-channel / adjacent-channel interferenceNearby APs on the same channel share airtime (co-channel); APs on partially overlapping channels such as 1 and 3 corrupt each other (adjacent-channel)Give neighboring APs different non-overlapping channels: 1, 6, 11 (2.4 GHz)
Authentication failureOne client: wrong or outdated saved passphrase, missing/expired certificate, or security-type mismatchForget and re-add the network; fix the client's credentials. If every 802.1X client fails, check the RADIUS server
Excessive roamingTransmit power set so cells overlap heavily; clients bounce between APsTune AP transmit power for clean cell boundaries
Fewer 5 GHz channelsWrong regulatory country code, or DFS channels disabledSet the correct country code; review DFS settings
See how it connects
Alvin Varughese
Written byAlvin Varughese
Founder•20 professional certifications