LANCOM Support Knowledgebase Document No. 1902.2513.5721.MMÜL - V1.20

Troubleshooting guide: Error message “AP configuration error 18” in LANmonitor in a WLAN controller scenario


Description:
This document describes which settings to make so that the error message “AP configuration error 18” no longer occurs in LANmonitor.

Some access points are equipped with two radio modules, one of which is purely for 802.11ac. In this case, this module cannot be set to the 2.4-Ghz mode.

This affects the following devices:
  • L-822acn
  • LN-830acn
  • LN-830E
  • LN-830U
  • LN-630acn
  • L-1302acn
  • L-1310acn
  • LN-862
  • LN-860
  • LN-1702
  • LN-1700
  • OAP-830 (both Wi-Fi modules cannot be changed)


If a WLAN controller being monitored in LANmonitor displays the error message AP configuration error 18, then the 2.4-GHz band has been assigned to the second Wi-Fi module in the configuration of the WLAN controller.




Procedure:

To operate the second Wi-Fi module within its supported parameters, it must be set to operate in the 5-Ghz band.

1) In the configuration of the WLAN controller, navigate to WLAN controller -> General.

2) Make sure that the Mode WLAN ifc.2 value is set to 5 Ghz preferred, fallback 2.4 Ghz. We recommend that you set Mode WLAN ifc.1 to the value 2.4 Ghz preferred, fallback 5 Ghz.

    Note:
    Alternatively you can set
    Mode WLAN ifc.1 to the value 2.4 Ghz only and Mode WLAN ifc.2 to the value 5 Ghz only.



3) In the configuration of the WLAN controller, navigate to WLAN controller -> AP configuration -> Access point table.

4) Make sure that in the drop-down menus for Mode WLAN ifc.1 and Mode WLAN ifc.2 are each set to the value Default.

    Note:
    Here, too, you can alternatively set
    Mode WLAN ifc.1 to the value 2.4 Ghz only and Mode WLAN ifc.2 to the value 5 Ghz only.



5) It may be necessary to restart the affected access point in order to implement the changes to the configuration.

Catchwords: 18; error code; code; ap configuration errors; 802.11ac; ac
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