DHCPINFORM via a relay agent

[David W. Hankins]

On Sat, Aug 19, 2006 at 07:59:30PM +0900, Kan Sasaki wrote:
> I'm confused. Which is wrong? Is this a bug or a configuration issue?

This is a compounded bug.  Existing code that attempted to work with
clients that specify a ciaddr of 0.0.0.0 was 'enhanced' to deal even
better with them.  In the meantime, we appear to have brkoen clients
that specify non-zero ciaddr via relays.

You will have noted from your careful reading of rfc already that
such zero-ciaddr-DHCPINFORM clients are already not implementing
rfc2131.

I would hope that a future version of ISC DHCP would remove this
zero-ciaddr-client-handling behaviour by default, and move it to
a configuration option, with the minor change regarding using
the relay (should only use the relay when ciaddr is zero, and
always set the broadcast flag).

We can probably change the relay behaviour in 3.0.5rc2, but we'll
have to do the configurable option bits in 3.1.0 or later.

-- 
ISC Training!  October 16-20, 2006, in the San Francisco Bay Area,
covering topics from DNS to DHCP.  Email training at isc.org.
-- 
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