This is the non-technical reply but with the benefit of coming from an Apple 
Genius the other day.
I have had exactly the same problem recently but it has never really bothered 
me but (MacBook Air and an iMac) when I was in an Apple store 3 weeks ago I 
asked about it and I was told that if there is a cordless device like a 
telephone near the router that can sometimes interfere with the router and 
cause this. Solution keep other cordless devices away (at least 6ft is what he 
said) from router. I could only move mine an extra 2 ft away but haven't had 
the problem since.
By the way thanks John for that very comprehensive reply - almost too 
technical!!
Nick
On 20 Nov 2012, at 01:45, Stephen Watson <[email protected]> wrote:

> Hi all,
> 
> My partner woke his MacBook from sleep and it came up with a message to the 
> effect that "another device on this network is using the same IP address". He 
> saw the same message about two weeks ago, but we can't remember if it was 
> also when waking his Mac from sleep then.
> 
> We are using a Netgear modem connected to an Airport Extreme and all 
> connected wirelessly. We also have two iOS device and another Mac connected. 
> I used to see the same message myself when I was in Brighton every couple of 
> months.
> 
> What does it mean? What causes it? Is it any cause for concern and if so, is 
> there something we should do?
> 
> Thanks very much.
> 
> Stephen
> 
> Right. Way past my bed ... Zzzzz
> 
> 
> See my apps at www.blacktablet.co.uk
> 
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