Fighting Rogue Access Points At linux.conf.au

An anonymous reader writes "Last week's linux.conf.au saw the return of the rogue access points. These are Wi-Fi access points which bear the same SSID as official conference hotspots. Often it might be a simple mistake, but sometimes it's more nefarious. To combat the attacks this year, conference organisers installed a Linux-based Wi-Fi 'intrusion prevention and detection system' supplied by sponsor Xirrius." At most conferences I've been to, I'd be grateful just to be able to get on any access point.