udhcpd initial lease

[Dan Fandrich]

On Sat, Nov 27, 2010 at 07:48:44AM +1100, Grahame Jordan wrote:
> When using dhcpd on an embedded system after booting on some clients
> for example Windows7 it takes a long time
> to negotiate an ip address. In the case of Win7 it is insistent on
> using the previous IP address that it had at its previous
> connection to the device.
> 
> The problem is that on most embedded systems the leases file is empty
> after every boot. Making the negotiation
> difficult as there is no previous record in the leases file to
> negotiate with. The lease request needs to time out before
> a new lease can be requested resulting in long delays on getting an
> IP Address.
> Additionally some embedded systems generate a random MAC address
> every time they connect say over USB making the
> negotiation just as difficult as with an empty leases file.
> 
> I have created a patch that allows a request to go through if the
> leases file is empty. This results in very quick dhcp
> negotiating. To alleviate the random MAC address issue I empty the
> leases file which results in quick dhcp negotiation also.

Why should only the first client get this special privilege?  If any
client supplies an address and it's one that the server might randomly
allocate him already, why not let it go through?

>>> Dan