set/query 802.11 wireless debugging messages
command is a tool for enabling
and disabling debugging messages in the
options will display the current messages enabled for the specified network
interface (by default, ``wlan0'). The default debugging level for new
interfaces can be set by specifying the
option. When run as the super-user
can be used to enable and/or
disable debugging messages.
To enable debugging messages of a certain type
; to disable such messages use
. Multiple messages can be enabled and
disabled with a single command.
Messages are organized in the following groups:
- general debugging facilities; equivalent to setting the debug parameter
- dump packet contents on transmit and receive.
- crypto-related work.
- errors encountered during input handling.
- extended rate set handling (for 802.11g).
- information element processing in 802.11 management frames.
- management of per-station state.
- 802.11 station association processing; particularly useful to see when
stations join and leave a BSS.
- 802.11 station authentication processing.
- scanning operation; especially useful for debugging problems with not
locating an access point.
- errors encountered during output handling.
state machine operation.
- 802.11 power save operation; in hostap mode this enables copious
information about buffered frames for stations operating in power save
- trace operation of Hybrid Wireless Mesh Protocol processing.
- 802.1x state machine operation; not presently meaningful as 802.1x
protocol support is implemented in user mode by the
- radius backend operation as it relates to 802.1x operation; not presently
meaningful as 802.1x protocol support is implemented in user mode by the
- dump packets exchanged with the radius backend for 802.1x operation; not
presently meaningful as 802.1x protocol support is implemented in user
mode by the
- trace operation of 802.11s mesh protocol processing.
- trace operation of the WPA protocol; only partly meaningful as WPA
protocol support is mostly implemented in user mode by the
- trace operation of the Access Control List (ACL) support; see
for more details.
- trace operation of WME/WMM protocol processing.
- trace operation of Atheros SuperG protocol processing.
- trace operation of IEEE 802.11h protocol processing.
- trace station inactivity processing; in particular, show when stations
associated to an access point are dropped due to inactivity.
- trace station mode roaming between access points.
- trace transmit rate control operation.
The following might be used to debug basic station mode operation:
wlandebug -i wlan1
it enables debug messages while scanning, authenticating to an access point, and
associating to an access point.
Different wireless drivers support different debugging messages. Drivers such as
that depend on the
module for 802.11 protocol processing typically support most of the debugging
messages while devices that implement parts of the 802.11 protocol in firmware
Some debugging messages are no longer meaningful because protocol processing has
moved from the operating system to user mode programs such as