Bro is a really great tool. At my job we use an IDS called Snort in conjunction with a homegrown sensor environment. I'd also suggest taking a look at Suricata. It is similar to Bro but I think there a few feature differences there.
keep them coming! Infosec illiterates appreciate these small bits :)
[insert bro joke here]
Cool introduction to NSM and bro!
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