DHCPv6 Client Configuration

David W. Hankins dhankins at isc.org
Wed Oct 28 17:10:30 UTC 2009

On Fri, Oct 23, 2009 at 12:21:35PM -0400, Daniel Le wrote:
> Could someone please give an example of how to configure DHCPv6 Client
> for the options Authentication "keyinfo",

We don't currently support Authentication, tho it's on our agenda.
For my part I am mostly resisting authentication related code until we
have a framework I think operators can really use realistically (at
least a plan to solve the key distribution problem).

It is coming.

> Rapid Commit, and the
> statements to cover multiple client network interfaces within the same
> client host/system? A sample/snapshot of DHCPv6 client configuration
> file dhclient.conf would be very nice.

For this, in the source distribution, see doc/examples/, there's a
sample config for client and server.

In a future release we will probably send rapid-commit by default,
so that the server operator selects whether rapid-commit is used or
not, but for now there is a sample config snippet for clients to send

Probably system integrators should use that in their default configs.

Just list multiple interfaces on the command line (or start one daemon
per interface, but in this case you want to give different -lf and
-pf flags for separate lease and pid files).

> Also, to configure multiple IPv6 dynamic addresses on a same interface,
> I understand one way is to use an IA that contains multiple addresses.
> However since the current ISC DHCP production release 4.1.0.p1 only
> supports a single address per IA, can we configure a client interface to
> be associated with multiple IAs, thus letting it have multiple
> addresses?

This shouldn't be true, the dhcpv6 client should support multiple
IAADDRs in any IA_NA or IA_TA (also multiple IAPREFIXes in any

The DHCPv6 server has a configuration knob so the operator can
indicate how many addresses the client should get.  Presently the
"way to select what addresses a client should get" is pretty lame,
and the server will give one from each pool until it satisfies the
configured address count (so you are limited to one pool per prefix).

Anyway, if it doesn't work, it's a bug.

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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