[PATCH RFC v2 0/3] dhclient: add --prefix-len option

Shawn Routhier sar at isc.org
Wed Dec 2 21:53:10 UTC 2015

> On Dec 2, 2015, at 1:46 PM, H. Peter Anvin <hpa at zytor.com> wrote:
> On 12/02/2015 12:47 PM, Shawn Routhier wrote:
>> I merged them last night (my time - US PT) so it would depend on when you
>> did the pull.  I haven’t reviewed your changes yet so it’s possible that there
>> aren’t issues, but given the quick look I did on the first patch I think you would
>> have noticed.
> Yes, in fact looks like we implemented several similar things although
> in slightly different ways.  Unfortunate timing.  I will try to update
> the patchset as soon as possible.

We are about half way through a release cycle.  I’m not sure if we
would get your patch into the next release or not.  We would definitely
put it into our bug system so it wouldn’t get lost.

> RFC 7550 seems to imply that unsatisfied prefix requests should be
> repeated in at least a REBIND message, possibly a REQUEST message too?
> 	-hpa

yes, my patch should do that.

Similarly for NA addresses as well

there is also a change to the scoring algorithm to choose leases
from different servers (if you actually have two or more dhcp servers
to choose from).  The new scoring prefers more bindings over more
addresses.  So a lease with an IA_NA and IA_PD with one address (prefix)
each is preferred over a lease with an IA_NA with two addresses.


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