I have two ASA-5520's in active/standby mode servicing a 500-node LAN w/ 1 outside interface, 1 inside interface, and 1 DMZ. How best to implement IPS, preferably using integrated modules, and without introducing a single point of failure? Also, what software would I need to install & manage IPS? Can it be managed thru ASDM or is something like Cisco Security Manager (CSM) necessary? TIA!