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Léo Léopold Hertz 준영
Asked: 2011-09-22 13:50:32 +0800 CST

Disable wlan0 -device permanently

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I executed unsuccessfully the following line in /etc/rc.local with permissions 755:

sudo ifdown 00:1f:9c:c3:b3:77

where the last word is presenting the address of my wlan0 device.

Having the command rfkill block $IP-address-Of-my-wlan0 in startup scripts is not possible solution, since Network-manager is able to change soft-blocks.

You cannot configure each device separately in Network tools or in Network manager. If you change one setting the setting applies to other wifi -device too. I cannot use WICD because I need Network Manager's Mobile Broadband -feature.

How can you put a permanent software block to the given wifi -device in Ubuntu 11.10 at each startup such that other programs such as Network manager do not change it?

There is probably a file which permissions are only needed to be changed to 700 to disallow for example Network Manager to reach the device wlan0. How can you give only the user the permission to touch the device wlan0?

wireless

1 Answers

  1. Best Answer

    It's simply not possible to block root access to a file without using something like AppArmor or SELinux.

    As long as your two WLAN devices use different drivers, this method should work for you:

    First, determine which driver you are using. In my case, from this output:

    mark@xiii:/var/log$ sudo dmesg | grep -e 'Ethernet' -e 'WiFi'

    ...jme 0000:07:00.5: eth0: JMC250 Gigabit Ethernet chiprev:23....[SNIP] ...iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:

    So this tells me my wifi driver is "iwlagn". I can either append blacklist iwlagn to a file in /etc/modprobe.d/ or create a new file, perhaps /etc/modprobe.d/my-personal-blacklist.conf that only contains the line blacklist iwlagn.

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