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6.4.2. Wireless Performance Issues
| Issue | Cause | Solution |
|---|---|---|
| Interference | Non-Wi-Fi sources on the same frequencies (microwave ovens, Bluetooth, cordless phones in 2.4 GHz) or neighboring networks crowding your channels | Change channel, use 5 GHz |
| Distance | Too far from AP | Add APs, increase power |
| Absorption | Walls, furniture blocking signal | Reposition AP, add APs |
| Overcapacity | Too many clients per AP | Add APs, balance load |
| Co-channel / adjacent-channel interference | Nearby 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| Authentication failure | One client: wrong or outdated saved passphrase, missing/expired certificate, or security-type mismatch | Forget and re-add the network; fix the client's credentials. If every 802.1X client fails, check the RADIUS server |
| Excessive roaming | Transmit power set so cells overlap heavily; clients bounce between APs | Tune AP transmit power for clean cell boundaries |
| Fewer 5 GHz channels | Wrong regulatory country code, or DFS channels disabled | Set the correct country code; review DFS settings |
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Written byAlvin Varughese
Founder•20 professional certifications