You can also get netflow data from Cisco ASA firewalls but be warned since Cisco heavily modified the netflow data format for the ASA firewall. One tool that does understand the Cisco-modified format is ManageEngine’s Netflow Analyzer. That one is a free download and runs as the full product for 30 days then reverts to a stripped down free product. Or you can get the Cisco tools for manging the ASA but they are more expensive. I don’t know if Nagios has a plugin that understands the Cisco ASA version of netflow but I would guess the commercial salesguys would be more than happy to answer that question.
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