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Locating Rogue Switches and Hubs on network

Posted on 2006-10-23
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Last Modified: 2010-05-18
I recently changed companies and am now settled into my new job. Problem, on this network- I have learned that there are unmanaged switches and hubs up in the ceiling. Is there a utility that can walk the network (SNMP will not work of course) and tell me that there is a presence of these devices? This building is so huge, that I need to automate this process. Help!
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Question by:Trihimbulus
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handrich earned 2000 total points
ID: 17791409
Hello
i have bad news unmanaged switches and unmanaged hubs (multi port repeater) ar transparent to the network. You have no choice to locate hubs automaticaly by software. The only thing that makes them visible is their latency. Switches at 100BaseTX are 8–20 µs;  Hubs 100BaseTX: < 0,7 µs. (µs not ms). You won'tl find a ping-tool that is precise enough. MAC-Flooding (and other hacking technics) can be used to make a switche visible, but if you have a lot of them mixed with hubs, i don't think that there is a real chance to do the job.

Maybe a Cable-Tester could help, but you would need an expensive high-frequency model, with such a box you could meassure the cable length and this could help to find the your hubs and switches.
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