dhcpv6 server and dhclient IA_PD support

[Kunal Sharma]

Hi Aaron,

I know I'm late in trying out the dhcpd PD thing but I was shifted to some other higher priority task and could not give it a try. Thanks, though, for your suggested config.

I tried this out and when I asked the PD from server, here's what I got:

#dhclient -6 -P eth0

Nothing to flush.
RTNETLINK answers: Cannot assign requested address
Prefix BOUND6 old= new=2000:1:1:f00::/56

Any ideas why I would see this message ? I already had an IPv6 address on eth0 in a different subnet when I tried this. Also, I was expecting to see the prefix 2000:1:1:f00::/56 in the dhcpv6 packets from the server but I could not find it anywhere. 

I'll be trying out to change the dhclient-script to bind the prefix address to an interface and delegate to hosts on my lan interface.

Regards,
Kunal


-----Original Message-----
From: dhcp-users-bounces+ksharma=westell.com at lists.isc.org [mailto:dhcp-users-bounces+ksharma=westell.com at lists.isc.org] On Behalf Of Aaron Murrihy
Sent: Friday, May 28, 2010 6:38 AM
To: Users of ISC DHCP
Subject: Re: dhcpv6 server and dhclient IA_PD support

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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