My point wasn't that it can't be secure, not at all. I just wanted to point out that of the security measures, the only one I think really offers stiff protection is the VPN; the others are all too easily compromised. It doesn't require a cryptanalytic wizard to install Kismet and Airsnort. ACL, ESSID, and WEP are all trivially blown through.
But a VPN can offer real protection. I run wireless at home; I don't run anything but ssh over it and I don't worry about it. I've run wireless at places of employment, and as long as the only thing that can run over it is IPSec it can be Ok as well. -Bennett
