DHCP, Dynamic DNS, and IPv6

[David W. Hankins]

On Sat, Aug 30, 2008 at 09:43:56AM -0700, Ted Lemon wrote:
> However, given a V6 DUID, the DHCP server should generally be able to guess 
> what the V4 client identifier would be for any client that uses the 
> client's MAC address as an identifier.   Of course, now that I think of it, 
> this falls over if the client has two network interfaces, since generally 
> speaking the client will only use the MAC address of one of those 
> interfaces to generate the client identifier.   Sigh.

I think you mean that the v4 clients that use a client-id always use
the MAC address of the interface they're configuring (and multiple
client id's).  But the v6 clients choose one DUID they use for all
interfaces, which will contain one MAC address of one interface.  They
will retain this DUID even if the interface is removed from the
system.

So the DUID contents aren't really reliably usable to match down to
DHCPv4 client id's or chaddr contents.

-- 
Ash bugud-gul durbatuluk agh burzum-ishi krimpatul.
Why settle for the lesser evil?	 https://secure.isc.org/store/t-shirt/
-- 
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