subenet-mask option in DHCPACK for DHCPINFORM

David W. Hankins David_Hankins at
Mon Jul 23 18:16:45 UTC 2007

On Mon, Jul 23, 2007 at 11:01:03AM -0700, Jane Du (jadu) wrote:
> Is it implementation intent that DHCPACK in responding to DHCPINFORM
> always has subnet-mask option along with the options requested by the
> client? It seems to be the case even when the client doesn't request
> this option.  

No, this is an oversight.  We started sending the subnet-mask in
discover/offer/request/ack to match other server implementations (and
to be compatible with clients which are dependent on this behaviour).

That is also affects dhcpinform was an error.

Ash bugud-gul durbatuluk agh burzum-ishi krimpatul.
Why settle for the lesser evil?
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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