ISC DHCP server offers fixed IP addresses to ANY device!

[David W. Hankins]

On Sat, Dec 20, 2008 at 02:37:35PM +0530, Jatinder Goswami wrote:
> Can you please let us know how to configure dhcpd for reserved IP
> functionality.

'fixed-address' declarations are distinct from the idea of reserved
dynamic allocations.  Because fixed-address setups do not carry a
lease through the resulting states, there is no hard drive access,
and consequently, no fsync-rate limit to response performance.

But this doesn't really answer your question either.

When I added reserved IP support, it was new, and I wasn't really sure
how it would be used (most people seem to prefer fixed-address
statements for aforementioned simplicity reasons, 'reserved' flagged
leases seemed at the time to be largely only useful to MS->ISC
conversions, and as such, probably done once at lease-database-
migration time).  So the only ways to reserve an IP address out of
a dynamic pool right now are to edit dhcpd.leases inbetween a restart,
to use OMAPI, or to try the "infinite-is-reserved" feature, which was
a kind of shot in the dark on my part in the area of not-migrating
reserved lease support.

None of those are really good options.  In retrospect, now that I've
seen how folks plan to use it, I think we could have supported a
situation where the server is directed to reserve leases for specific
host records (just add a 'reserve' boolean config value) or classes,
and this could at least be used for hosts that do not roam around the
network.

This would probably take betwen 5-10 lines of code, if anyone feels
like contributing it.

In other news, we're looking at better database backends (and a mode
of operation that is not memory based), and better CLI tools for
runtime configuration management.

-- 
Ash bugud-gul durbatuluk agh burzum-ishi krimpatul.
Why settle for the lesser evil?	 https://secure.isc.org/store/t-shirt/
-- 
David W. Hankins	"If you don't do it right the first time,
Software Engineer		     you'll just have to do it again."
Internet Systems Consortium, Inc.		-- Jack T. Hankins
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