dhcpv6 server and dhclient IA_PD support

Aaron Murrihy aaron_m at aaron-m.co.nz
Mon May 31 21:54:31 UTC 2010

Yes, dhclient does do this, and setting up this hook script is quite easy.
The problem is that dhclient does not have a configuration option for
binding the requested prefix to another interface on that device.
This functionality is essential for subleasing adrresses from this
delegated prefixes.
If I am mistaken in this though, please let me know because it would
be a huge relief for me.

On Tue, Jun 1, 2010 at 2:30 AM, Patrik Lahti <plahti at qnx.com> wrote:
> I haven't tried this, but AFAICT from the code, dhclient will provide
> $ip6_prefix to the dhclient-script when it has received a delegated prefix.
> All you'd have to do is implement a suitable script which creates/updates a
> rtadvd.conf and re/starts/stops rtadvd accordingly...
> /P
> On 10-05-27 09:08 PM, Aaron Murrihy wrote:
>> Hi Kunal.
>> I asked this exact same question on this mailing list a couple of
>> weeks back, but unfortunately no answer was able to be provided.
>> Let me outline the fruits of my labours thus far: In the man pages
>> where it says that "option dhcp6.ia-pd" is not implemented is an
>> error, it actually has. This has been fixed in the 4.2 beta. I have
>> been unable to discover a way to bind a prefix (or address) to
>> another interface on the device. It seems an odd feature to not
>> have. WIDE DHCP has a very simple config option for doing this.
>> This is an example of the server config I am using to delegate a
>> prefix: default-lease-time 600; max-lease-time 7200; log-facility
>> local7; subnet6 2001:db8:0:1::/64 { # Range for clients range6
>> 2001:db8:0:1::129 2001:db8:0:1::254; # Prefix range for delegation to
>> sub-routers prefix6 2000:1:1:100:: 2000:1:1:f00:: /56; }
>> You just have to request a prefix using the client's -P option.
>> Anymore questions don't hesitate to ask either using this mailing
>> list or my personal email address.
>> Also might I ask if you have any breakthroughs in this area to let me
>> know?
>> Cheers Aaron
>> On Thu, May 27, 2010 at 10:57 PM, Kunal Sharma<KSharma at westell.com>
>> wrote:
>>> Friends,
>>> I'm new to using ISC DHCP and I have 4.1.1 source code. For my
>>> *practical* purpose, I have a running configuration of server and
>>> client working in tandem. But its just basic.
>>> I've looked at the "option dhcp6.ia-pd" on the server end (and I
>>> can't seem to find any example config for the same) but nothing for
>>> the client. I also have my doubts what with all the documentation
>>> saying this might not be supported yet. Does the support exist in
>>> 4.1.1 ?
>>> I need to be able to configure my dhclient in a way that its
>>> request a PD from the server and configures one or more interfaces
>>> based on that. How would the dhclient configure different subnets
>>> on different interfaces (for simplicity's sake, lets consider just
>>> one subnet for one interface) from the prefix delegated by the
>>> server ?
>>> Thanks, Kunal
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