'DHCPACK (to|on) ...' in log messages: design or accident

David W. Hankins dhankins at isc.org
Wed Sep 9 17:37:08 UTC 2009

On Tue, Sep 01, 2009 at 03:19:39PM +0100, Niall O'Reilly wrote:
> I'm hoping that this is a design feature on which I can depend, as it
> gives very convenient guidance for extracting information from the logs.
> OTOH, it may just be a lucky accident.
> I'ld appreciate an authoritative clarification.

i actually have no idea if it was intentional or not.  i suspect it
was probably an accident because INIT/INIT-REBOOT/SELECTING clients
would not have the responses sent "to" them, they would either be
locally broadcast or sent "to" a relay.  DHCPINFORM however was
supposed to be very simple query/reply with the client clearly
identifying its unicast IPv4 address...but contact with actual
dhcpinform clients later changed this, and there are situations where
the syslogged address isn't even the client's.

i certainly have no intention of changing the logs for something
cosmetic like this tho.

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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