Ad-Hoc mode in IEEE 802.11a

Ad-Hoc mode in IEEE 802.11a

By default, the NIC are set-up with US regulatory domain. Thus ad-hoc mode is unavailable (take a look on dmesg).

What to do: <syntaxhighlight lang="bash"> apt-get install pkg-config git-core libnl-dev libgcrypt11-dev git clone git://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/crda.git cd crda; make; make install </syntaxhighlight>

• after having installed the correct reg file: git clone git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-regdb.git
• You now have a new file /etc/udev/rules.d/XXXregulatory.rules, containing:

KERNEL==”regulatory*”, ACTION==”change”, SUBSYSTEM==”platform”, RUN+=”/sbin/crda”

The interested reader should take a look on wireless.kernel.org

You should now be able to change the reg domain:

• iw reg set FR / NO, etc.
• and iw phy0 info should let you know that IBSS (ad hoc mode) is available for some channels in the 5GHz band