How do I configure advanced WiFi Settings?

Beverly McRae

WiFi Settings (Advanced)

This is the product manual section for advanced WiFi Settings. To edit these settings, go to Network Settings → WiFi / Local Networks.

When you select either of the WiFi tabs (2.4 GHz or 5 GHz) in the Local Network Interfaces section, you have several additional options for configuring your wireless LANs under the WiFi Settings heading.


Channel Selection Method: This controls how a WiFi channel is selected.

  • User Selection – Manually set the channel.
  • Random Selection – The router randomly sets the channel.
  • Smart Selection (Default) – Scans to determine the lowest interference WiFi channel.

Channel Selection Schedule: When using the “Smart” channel selection, this controls whether the router will periodically rescan for a better channel and change to it. Select from “Once,” “Daily,” “Weekly,” or “Monthly.” Note that there may be a momentary WiFi disconnection while the channel changes.

Optimize WiFi/WiMAX coexistence: (Shows if Smart Selection or Random Selection is chosen and the WiFi band is 2.4 GHz.) Setting this will lessen any possible conflict with WiFi in the 2.4 GHz band and an attached WiMAX modem. If a WiMAX modem is attached to the router when the WiFi is enabled, the WiFi channel and transmit power will be set to levels that optimize the performance of the WiMAX modem. If no WiMAX modem is attached, then default channel and power settings will be used even if this is selected.

Channel: (Shows if User Selection is selected.) The WiFi channel corresponds to a frequency the router uses to communicate with other devices. For 2.4 GHz, the range is 1 to 11, and 1, 6, and 11 do not overlap each other. If a WiMAX modem is attached, a higher number channel will increase the chance the router’s WiFi and modem’s WiMAX radios will conflict with each other, which may result in lower throughput. Select a channel from the dropdown list:

  • 1 (2412 MHz)
  • 2 (2417 MHz)
  • 3 (2422 MHz)
  • 4 (2427 MHz)
  • 5 (2432 MHz)
  • 6 (2437 MHz)
  • 7 (2442 MHz)
  • 8 (2447 MHz)
  • 9 (2452 MHz)
  • 10 (2457 MHz)
  • 11 (2462 MHz)

For 5.0 GHz, the ranges are 36 to 64 and 149 to 165. These channels do not interfere with a WiMAX modem.

  • 36 (5180 MHz)
  • 40 (5200 MHz)
  • 44 (5220 MHz)
  • 48 (5240 MHz)
  • 149 (5745 MHz)
  • 153 (5765 MHz)
  • 157 (5785 MHz)
  • 161 (5805 MHz)
  • 165 (5825 MHz)

Client Timeout: If the access point is not able to communicate with the client it will disconnect it after this timeout (in seconds).

TX Power: Normally the wireless transmitter operates at 100% power. In some circumstances, however, there might be a need to isolate specific frequencies to a smaller area. By reducing the power of the radio, you can prevent transmissions from reaching beyond your corporate/home office or designated wireless area. RTS Threshold: When an excessive number of wireless packet collisions are occurring, wireless performance can be improved by using the RTS/CTS (Request to Send/Clear to Send) handshake protocol. The wireless transmitter will begin to send RTS frames (and wait for CTS) when data frame size in bytes is greater than the RTS Threshold. This setting should remain at its default value.

Fragmentation Threshold: Wireless frames can be divided into smaller units (fragments) to improve performance in the presence of RF interference and at the limits of RF coverage. Fragmentation will occur when frame size in bytes is greater than the Fragmentation Threshold. This setting should remain at its default value. Setting the Fragmentation value too low may result in poor performance.

DTIM: A DTIM is a countdown informing clients of the next window for listening to broadcast and multicast messages. When the wireless router has buffered broadcast or multicast messages for associated clients, it sends the next DTIM with a DTIM Interval value. Wireless clients detect the beacons and awaken to receive the broadcast and multicast messages. The default value is 1. Valid settings are between 1 and 255.

Beacon: Beacons are packets sent by a wireless router to synchronize wireless devices. Specify a Beacon Period value between 20 and 1000 milliseconds.

WPS: WiFi Protected Setup is a method for easy and secure establishment of a wireless network. It can be used instead of passwords when connecting clients that support WPS.

Short Slot: Slot Time is the period wireless clients use in determining if the channel is free for transmission. Enabling this value allows clients that can utilize a shorter time to do so. Disabling this option forces all clients to use a longer backoff check and thus may reduce network throughput while reducing the number of transmission collisions.

Wireless Mode: Select the WiFi clients the router will be compatible with. Greater compatibility is a tradeoff with better performance. For greatest compatibility with all WiFi devices, select “802.11 a/b/g/n”. For best performance, connect with only other 802.11n-compatible devices and select “802.11 n.”

  • 802.11 b
  • 802.11 b/g
  • 802.11 a/b/g/n
  • 802.11 b/g/n
  • 802.11 n

Channel Width: Selects whether the router uses a single 20 MHz channel to send/receive, or uses two adjacent 20 MHz channels to create a 40 MHz channel. Higher performance is possible with the 40 MHz channel. Selecting Auto is generally best. Enabling WiFi as WAN will force 20 MHz only mode.

Extended Channel: When operating in 40 MHz mode the access point will use an extended channel either below or above the current channel. Optimal selection will depend on the channels of other networks in the area.

MCS: 802.11n uses multiple Modulation Coding Schemes to enable higher throughput in various environments. Since clients can dynamically change rates depending on environment, selecting Auto is generally best.

Short GI: Short GI is an optimization for shortening the interval between transmissions. May be incompatible with older clients.

Greenfield Mode: Greenfield mode uses an 802.11n-only preamble to transmit packets that older wireless clients cannot interpret. Use of greenfield mode in a mixed 802.11 environment may result in degraded performance but can improve performance if all devices in the area are 802.11n compatible.

RADIUS Timeout: (Default: 3600 seconds) When using an Enterprise security mode clients will be forced to re-authenticate with the RADIUS server at this interval in seconds. This allows administrators to revoke access so when an attached client’s authentication expires, the client must re-authenticate.

RADIUS Retry: (Default: 60 seconds) When using an Enterprise security mode, if a RADIUS query fails to receive a response from the server it will delay by this interval (in seconds) before attempting another query. This helps protect the network from floods of authentication requests if the RADIUS server is temporarily unreachable.

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