When I initially setup my APs I was told that broadcast SSID had to be on for machines to roam between APs. Now I would really like to turn off the broadcast. Anyone running without broadcast and roaming ok?

Anyone know of any tools to track down the PC of a potential hacker? I've got things buttoned up pretty tight so I'm not concerned, but once in a while I'll get a syslog warning that an unauthorized user is trying to authenticate. Sure would be nic...