Wireless on FreeBSD - It Talks!01 Sep 2002
After being very frustrated trying getting WiFi to work with a FreeBSD notebook and my Linux router a few weeks ago, yesterday I decided to try it again, being unhappy with the difficulty of Mandrake current and last week half-heartedly installing Debian.
The trick was that there is no trick. Even though the Linux router is not a an access point, it's not in demo adhoc mode, but rather in IBSS mode. The FreeBSD defaults for the wi device work out of the box. I set the network name and off she goes.
Reference: Using a Unix computer as a 802.11 wireless base station: "The terminology here can be rather confusing, because some 802.11 vendors, e.g., Aironet, refer to IBSS mode as 'ad hoc'."