[Bug 3553] Retain lease information for udhcpc across restarts

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=3553

--- Comment #2 from Philip Prindeville <philipp at redfish-solutions.com>  ---
(In reply to comment #1)
> (In reply to comment #0)
> > If you're using udhcpc as a client when connecting to your ISP, and you happen
> > to restart your router, it would be nice to be able to retain the least and
> > request the same IP address when restarting.
> 
> I'm confused. Something doesn't let you use -r IP option to achieve this?
> Please describe the problem in more details.

The initiates a /new/ lease request that asks for a specific address (i.e. via
a DISCOVERY packet).

I'm talking about reusing all of the previous state (server address, IP
address, transaction address, expiration time, lease duration, etc) to refresh
the /current/ lease (i.e. via a REQUEST packet), assuming that the previous
lease hadn't been released during shutdown.

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