DHCP, Dynamic DNS, and IPv6

David W. Hankins dhankins at isc.org
Wed Jun 10 23:36:19 UTC 2009

On Wed, Jun 10, 2009 at 03:53:05AM -0700, Loren M. Lang wrote:
> prerequisite that the DHCID must be identical to what DHCP knows.  Then
> the DHCID is deleted only if there are no A or AAAA records for that
> name.  If I statically configure AAAA records for a client after DHCP

That's correct, this is actually a bug we repaired recently and queued
for DHCP maintenance releases (it is also a bug when doing ddns
updates for the same client across protocol versions).  It's in
4.0.2b1, not sure about 4.1.1b1 or 3.1 maint.  

I think the check should actually be "does any RR other than DHCID
exist on this name?" rather than specifically for neither AAAA nor
A, but I do not think DNS update protocol has the language to describe

> proposed standard.  Is there a road map for implementing the RFCs for
> DHCPv4?

We hope to start on this sometime after the current ddns update code
rework.  The main obstacle is nailing down the migration model.

We also have some other ddns update 'styles' in mind, using the RFC's
permissive language to facilitate some other use cases.

>   I assume DHCPv6 is currently doing dynamic updates according to
> the RFCs.

No, we're currently using the same DHCPv4 routines.

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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