Warning: subnet overlaps subnet
David W. Hankins
David_Hankins at isc.org
Tue Mar 18 20:53:06 UTC 2008
On Tue, Mar 18, 2008 at 11:38:05AM -0500, John Hascall wrote:
> OK. Let me step back. Here's what I would like to accomplish.
> We have two DHCP servers. We do not use failover.
> One is the main DHCP server. It handles everything.
> The second is maintained as a warm spare, but it does
> serve out addresses for all the fixed-address machines.
> All this works fine. We have monitoring software that
> basically sends DHCPINFORMS at the dhcp server and
> waits for the acks. This works good for the primary,
> but the second server never answers because it is
> not authoritative. My one host subnet was an attempt
> to make the second server answer the monitoring host.
let me quote you the comment on the code that decided to overload
the 'authoritative;' flag with whether or not to respond to
/* We don't respond to DHCPINFORM packets if we're not authoritative.
It would be nice if a per-host value could override this, but
there's overhead involved in checking this, so let's see how people
react first. */
it's been a few years since that comment was written, but it appears
that you are "reacting" negatively to this author's comments.
i think the answer hopefully does not involve gymnastics in the subnet
sources to permit overlapping regions. we should just create a config
option for this and default to inspecting authoritative in its absence.
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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