We are currently a OpManager customer and are looking to add NetFlow analyzer. We will be using a passive fiber tap to mirror our 4 Gig-E Internet uplinks into a couple of boxes running Linux, which will then run the open-source pmacct tool. This tool will take the mirrored traffic and then convert it into a NetFlow v9 stream and send it to the collector (in this case, it would be NetFlow analyzer). We will do this across a total of 4 Gig-E router interfaces, so I assume that means I only need a license for 4 interfaces?