iw
iw is a command-line tool used for configuring and managing wireless devices in Linux. It supports the modern nl80211 interface and is intended to replace older tools like iwconfig. The iw command provides more advanced and detailed control over wireless interfaces and supports the latest features of wireless hardware.
Basic Usage
To use iw, you typically need root privileges. The general syntax of the iw command is:
Common Commands and Options
List Devices
List all wireless devices:
Example output:
Link Status
Show information about the current link:
Example output:
Scan for Networks
Scan for available wireless networks:
Example output:
Set Interface Down
Bring a wireless interface down:
Example:
Set Interface Up
Bring a wireless interface up:
Example:
Join a Network
Connect to a wireless network (requires WPA supplicant for encrypted networks):
For encrypted networks, additional configuration with WPA supplicant or network manager is needed.
Disconnect from a Network
Disconnect from the current network:
Set Wireless Power Save Mode
Enable power save mode:
Disable power save mode:
Show Station Information
Show information about connected stations (for access points):
Change Wireless Interface Type
Change the type of a wireless interface (e.g., from managed to monitor):
Example Configuration Workflow
List Available Wireless Interfaces
Bring the Interface Down
Set Interface Type
Bring the Interface Up
Scan for Available Networks
Connect to a Network
Conclusion
The iw tool is a powerful utility for managing and configuring wireless devices in Linux. It provides comprehensive control over wireless interfaces and supports advanced features. By mastering iw, administrators can effectively manage wireless connectivity and troubleshoot issues.
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