How can an MSP discover all devices on a new client's network, and how quickly?
Watch the traffic passively for a few days: most devices reveal themselves within hours, and the rest within days, as they request addresses, resolve names and talk to servers. Put one sensor on a mirror port of the main switch, then compare what appears with the client's own list, the router's connected devices and the switch's port table. Expect surprises: forgotten servers, personal devices, a supplier's router in a cabinet. A device that never sends traffic, or sits on a segment you do not mirror, will not appear, so walk the site too. NetSenX's network map does this on every plan, Free included: devices with their announced names, first and last seen, and who talks to whom, without probing anything.
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