I've recently begun researching network monitoring solutions. I've configured SPAN on our cisco catalyst, and it's working ok, but I've been reading up on taps too. Most of the articles I've seen reference cost as the major drawback. Unless theres something I'm missing about this technology it seems ike it could be implemented with a commodity PC and three NICs (in, out, and the monitor port.) Does something like this exist, or am I way off?
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