[Gllug] Is there such a thing as reverse DHCP?

John Edwards john at cornerstonelinux.co.uk
Sun Jan 16 21:27:12 UTC 2011

On Sun, Jan 16, 2011 at 09:14:18PM +0000, Robert McKay wrote:
> On Sun, Jan 16, 2011 at 1:36 PM, John Winters <john at sinodun.org.uk> wrote
>> way to ask it to provide the information the other way?  That is, send
>> it a query giving an IP address and have it return a response with a MAC
>> address - the MAC address to which it would assign the given IP address?
>> So far I've failed to find such a query.
> Something wrong with arp? or the ip equivalent "ip n l" (ip neighbour list)?

As this is for a Wake-On-LAN script I think the machines have
probably been powered off for longer than the arp timeout and
so are no longer in the kernel arp records. 

I think that either accessing the DHCP records or using something
like arpwatch to keep a record of MAC addresses may be the answer.

|    John Edwards   Email: john at cornerstonelinux.co.uk    |
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