Matt Mossholder on 2 Jan 2015 05:44:05 -0800

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Re: [PLUG] How to Detect Unmanaged Switches?

On Jan 2, 2015 8:25 AM, "Casey Bralla" <> wrote:
> I've been playing around with some python code I wrote to monitor my
> home/small business network.   I basically want to detect whenever any of my
> very low cost hardware (ie cheap sh*t) goes south and needs to be rebooted.
> I can ping known devices and retrieve things like internal web pages to verify
> the device is working, but I've got several dumb switches that have started to
> age and occasionally go off-line.   I can detect the absence of devices on the
> other side of the switch, but I'd like to see if the switch itself is dead.
> The switch won't ever respond to pings (since it has no IP address).
> is there a utility like nmap that will seek out arp addresses or some other
> information that will let me know if a dumb switch is on line?
> --
> Casey Bralla
> Chief Nerd in Residence
> The NerdWorld Organisation

Have you tried monitoring for spanning tree protocol frames? That should catch most switches.

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