DHCID calculation bug

David W. Hankins dhankins at isc.org
Fri Jul 17 16:55:24 UTC 2009

On Fri, Jul 17, 2009 at 09:42:11AM +0200, René GARCIA wrote:
> Is there any reflexion to make DHCID values match for the same client using
> DHCPv6 for IPv6 and DHCP for IPv4 ? I know that this has been discussed many
> years ago (on 2003 I think) but I haven't seen any conclusion. Another idea
> was to create a DHCIDv4 and a DHCIDv6 to make both protocols independant but
> I can't find any RFC fixing this.

I think the RFC approach is to require that clients implement the
DUID-based client identifier, in which case the DHCPv6 and DHCPv4 client
on the same system would be identified by the same DUID.  The
specification is a little incomplete because it doesn't alter the non-
normative direction in RFC 2131 requiring a server to treat the DHCPv4
client identifier as an opaque value, but this is not normative so a
server that does this still conforms.

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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