[Dnsmasq-discuss] No new lease for Option 82 requests until old one times out

Simon Kelley simon at thekelleys.org.uk
Wed Sep 17 21:50:17 BST 2014


On 17/09/14 21:47, Simon Kelley wrote:

> To make this work, you'd need some extra semantics, either explicit or
> implicit, to enable the old binding to be abandoned. Abandoning a
> binding is dangerous, since when it granted the lease, the server was
> promising the client exclusive use of the IP address. There is precedent
> for this: the form of dhcp-host which has more than one MAC address
> allows exactly then abandonment of a lease to one MAC address in favour
> of the other one.
> 
> It would be possible to define the dhcp-host=tag:cid0,192.168.2.99 form
> as having the same properties, or require some special keyword to enable
> this behaviour.
> 
> I think this covers Neil's points as well, part from the PXE one. There
                      ^^^^^^

Sorry, this should be "Jason's" ETOMANYEMAILS


> is already some logic that tries to do the right thing when the same MAC
> address sometimes presents a client-id, and sometimes doesn't. It
> doesn't solve the case of two different client-ids at differnet points
> in the netboot, AFAIK.
> 
> 
> Cheers,
> 
> Simon.
> 
>>
>> Regards
>>  /Joachim
>>
>>
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> 




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