wlan0 becomes unknown interface: No such

nix84 · 04-25-2014, 05:47 AM

I have a script in which I bring down & up wlan0.
After about 4-6 passes I get the following error both from the script and when I issue the same command (ifconfig wlan0 up) on the command line:
ifconfig wlan0 up
wlan0: unknown interface: No such device

In the script just for cleanliness I use:
rm -f /var/run/wpa_supplicant/wlan0
Does someone have an explanation why wlan0 becomes unknown?
Thanks

ondoho · 04-26-2014, 03:22 PM

why do you remove that file?
maybe it would work better if you took that bit out of your script.
what's that script doing anyway?
and why are you constantly connecting and disconnecting from wlan?
maybe you should explain your whole setup in more detail.

nix84 · 04-26-2014, 09:30 PM

The file is removed because with repeated use it gets corrupted by the system (not by the script).

The script is designed to find APs, display pertinent info on each, and connect via ad-hoc, WEP, WPA, or WPA2 proviso there is permission of course. It is also a fun exercise in scripting and learning about wifi.

I am disconnecting obviously because I am testing.

ondoho · 04-27-2014, 05:16 AM

Quote:

Originally Posted by nix84

The file is removed because with repeated use it gets corrupted by the system

how did you deduce that? if that were true then i'd say your actual problem is elsewhere in your system.

Quote:

The script is designed to find APs, display pertinent info on each, and connect via ad-hoc, WEP, WPA, or WPA2 proviso there is permission of course. It is also a fun exercise in scripting and learning about wifi.

yeah, it sounds like the kind of fun destined to bring down your system. i mean why would you want to constantly connect, disconnect and reconnect to different access points in a real situation?