[mrtg] Re: Duplicate IP?

Leif Neland leifn at neland.dk
Wed Aug 11 18:34:02 MEST 1999

On Mon, 9 Aug 1999 cpt2 at daimlerchrysler.com wrote:

> I don't know if this is off topic, but is there a utility that will
> send an alarm when there is a duplicate IP on the network/subnet?
> Does anyone know?

I don't think duplicate ip-adresses can exist on the same net.

I have only experienced it with windows-machines, and when windows sees
somebody else uses its ip-adress, it "backs off" and disconnects from the

The only way you might notice duplicate ip's is if the arp-adress
associated with an ip-adress changes (and then you should disregard
adresses given by dhcp)

You could hack up something only on a machine which has the whole
arp-table, eg. by doing a fping to your entire network. 
You could do it on a machine running "big brother", and doing a diff
between the arp-table on this run, and a stored copy from the last run.

Then firing off a message to the host running bb-pager.

look at http://MacLawran.ca/bb-dnld/


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