I'm running a very fresh -current on a Thinkpad T42 with an 802.11a/b/g 
card.  I also run ifwatchd, and I see that carrier on the ath interface 
is dropped/restored about once per minute.  Why is that?  At the 
moment, it's the active interface I'm using to get out to the world.

		--Prof. Steven M. Bellovin, http://www.cs.columbia.edu/~smb