Wireless

Wireless configuration in the web interface:

LuCi / Network / Wireless

Wireless configuration files:

/etc/config/wireless

WiFi Device Configuration

The Device Configuration section covers physical settings of the radio hardware such as channel, transmit power or antenna selection which are shared among all defined wireless networks (if the radio hardware is multi-SSID capable).

The available options are highly dependent of the wireless hardware the router has built in and the operating systems device driver.

2.4 GHz Radio

General Setup:

Operating Frequency:  
Mode 802.11n
Channel auto
Width: 20 MHz
Transmit Power: auto

Advanced Settings:

Country Code: CH - Switzerland
Allow legacy 802.11b rates No
Distance Optimization 15 meters
Fragmentation Threshold  
RTS/CTS Threshold  
Force 40MHz mode  
Beacon Interval  

5 GHz Radio

General Setup:

Operating Frequency  
Mode 802.11n
Channel auto
Width 40 MHz
Transmit Power auto

Advanced Settings:

Country Code CH - Switzerland
Allow legacy 802.11b rates No
Distance Optimization 10 meters
Fragmentation Threshold  
RTS/CTS Threshold  
Force 40MHz mode  
Beacon Interval  

WiFi Interface Configuration

Per network settings like encryption and mode of operation are grouped in the Interface Configuration.

Wireless Security

To get highest possible wireless network security, as of August 2018 the following is recommended:

  1. Use WPA2-PSK as encryption standard. Don’t use WPA or WEP or any mixed mode.
  2. Use CCMP as cipher. Don’t use TKIP.
  3. Create your own unique wireless network name (SSID). Don’t use common or often used names, provider names, your own name, etc. The network name will be used as Salt to hash your wireless password.
  4. Create a long wireless password (max. 63 characters) with diceware.
  5. 802.11w Management Frame Protection will probably not work with all devices. Try to set it to “Mandatory”. If some clients fail to connect, set it back to “Optional”.
  6. Enable WPS push button, if your router is in a secure location, without physical access from strangers.

example.net

General Setup:

Mode Access Point
ESSID example.net
Network lan
Hide ESSID No
WMM Mode Yes

Wireless Security:

Encryption WPA2-PSK
Cipher Force CCMP (AES)
Key ********
802.11r Fast Transition No
802.11w Management Frame Protection Optional
802.11w maximum timeout  
802.11w retry timeout  
Enable key reinstallation (KRACK) countermeasures Yes
Enable WPS pushbutton, requires WPA(2)-PSK Yes

MAC Filter:

MAC-Address Filter Disable

Advanced Settings:

Isolate Clients No
Interface Name  
Short Preamble Yes
DTIM Interval  
Disassociate On Low Acknowledgement Yes

WNDR3700 & WNDR3800 Wireless Chipsets

NETGEAR WNDR3800 routers use Atheros AR9220 (for 5 GHz) and Atheros AR9223 (for 2.4 GHz) wireless chips.

OpenWRT interfaces with these chips using the ath9k Linux wireless driver .

Atheros AR9220/AR9223 Features:

  • Supports spatial multiplexing, cyclic-delay diversity (CDD), and maximal ratio combining (MRC)
  • BPSK, QPSK, 16 QAM, 64 QAM, DBPSK, DQPSK, and CCK modulation schemes
  • Data rates of up to 130 Mbps for 20 MHz channels and 300 Mbps for 40 MHz channels
  • Wireless multimedia enhancements quality of service support (QoS)
  • 802.11e-compatible bursting
  • Support for IEEE 802.11e, h, and i standards
  • WEP, TKIP, and AES hardware encryption
  • 20 and 40 MHz channelization
  • 32-bit 0–33 and 66-MHz PCI 2.3 interface
  • Reduced (short) guard interval
  • Frame aggregation
  • Block ACK
  • IEEE 1149.1 standard test access port and boundary scan architecture supported
  • 337-pin, 12 mm x 12 mm BGA package

Atheros AR9220 Features:

  • Dynamic frequency selection (DFS) is supported in 5-GHz bands
  • All-CMOS MIMO solution inter-operable with IEEE 802.11a/b/g/n WLANs
  • 2x2 MIMO technology improves effective throughput and range over existing 802.11a/b/g products
  • 2.4/5 GHz WLAN MAC/BB processing

Atheros AR9223 Features:

  • All-CMOS MIMO solution inter-operable with IEEE 802.11b/g/n WLANs
  • 2x2 MIMO technology improves effective throughput and range over existing 802.11b/g products
  • 2.4 GHz WLAN MAC/BB processing

ath9k Modes of operation:

  • Station
  • AP
  • IBSS
  • Monitor
  • Mesh point
  • WDS
  • P2P GO/CLIENT

ath9k Features:

  • 802.11abg

  • 802.11n

    • HT20
    • HT40
    • AMPDU
    • Short GI (Both 20 and 40 MHz)
    • LDPC
    • TX/RX STBC
  • 802.11i

    • WEP 64 / 127
    • WPA1 / WPA2
  • 802.11d

  • 802.11h

  • 802.11w/D7.0

  • WPS

  • WMM

  • LED

  • RFKILL

  • BT co-existence

  • AHB and PCI bus

  • TDLS

  • WoW

  • Antenna Diversity