There's a lot of network monitoring recommendations in other questions, but none are what I'm looking for.
I'm looking for a distro specifically targeted to doing passive network monitoring (either inline or via port mirroring). Ideally it'll come mostly pre-configured with snort/base/ntop/bandwidthd/etc and hopefully some "glue".
I only need network data (bandwidth usage, snort alerting, and such), monitoring the health of items on the network is not the goal.
Any suggestions?