Allocating fixed IPv6 addresses to hosts with multiple NICs

[John.Gibbins at csiro.au]

Hi Frank,

Thanks for the link to the previous thread (I'm fairly new to this list).  I agree with most of the complaints in the thread, but have accepted that we need to live with DHCPv6 as it is designed.  Any change isn't going to happen in any useful timeframe.

I'm trying to make DHCPv6 work as I think it was intended to work (not how I'd like it to work).  One of the messages in the thread (https://lists.isc.org/pipermail/dhcp-users/2009-February/008092.html, extract below) suggested allocating a dynamic lease and then extracting the DUID from the lease database.  This clearly identifies that the dynamic lease assignment is based on the IA-NA which consists of the IAID concatenated with the DUID.  What I want to do is assign fixed IP addresses based on this same concatenation and not just the DUID.

To me this seems fundamental to DHCPv6, so I find it hard to believe that ISC DHCPD doesn't support it.  Can someone confirm that this is not supported or tell me what I've missed?

Thanks
johng
David_Hankins at isc.org said:
> Here's an example;
>
>   ia-na "@@\026v\000\001\000\001G`t$\000\014v\026@@" {
>
> Take off the fourst four octets. (@ @ \026 v), which are the
> IA-NA's IAID (we concat the IAID and DUID to form a unique identity
> for one binding...in this case, the client has used its last four
> MAC address octets as its IAID).
>
> Then use it in a host clause thusly:
>
>   host-identifier option dhcp6.client-id
>                         #    DUID-LLT - ETH -- TIME --- ---- address ----
>                                 00:01:00:01:47:60:74:24:00:0C:76:16:40:40;

--
John Gibbins
IT Security Operations (and IPv6 Evangelist)
CSIRO Information Management & Technology (IM&T)
Phone: +61 2 6124 1419  | Fax: +61 2 6124 1414 | Mob: 0419 605 562
John.Gibbins at csiro.au | www.csiro.au 
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Do not let what you cannot do interfere with what you can do - John Wooden


-----Original Message-----
From: dhcp-users-bounces+john.gibbins=csiro.au at lists.isc.org [mailto:dhcp-users-bounces+john.gibbins=csiro.au at lists.isc.org] On Behalf Of Frank Sweetser
Sent: Thursday, 13 January 2011 11:00 PM
To: dhcp-users at lists.isc.org
Subject: Re: Allocating fixed IPv6 addresses to hosts with multiple NICs

On 1/13/2011 3:19 AM, John.Gibbins at csiro.au wrote:
> Thanks Frank,
>
> We are an Enterprise.  We want to have control over what machines are allowed
> on our network and to be able to easily identify them by their IP addresses.
> EUI-64 and MS random addresses used by SLAAC make this hard so we want to use
> DHCPv6 to hand out addresses only to known machines.  We have a /32 block so
> we have an obscene number (2^96) of addresses to play with.

This issue has been brought up before.  Take a look at 
https://lists.isc.org/pipermail/dhcp-users/2009-February/008088.html for one of 
the longer discussions on it.

-- 
Frank Sweetser fs at wpi.edu  |  For every problem, there is a solution that
WPI Senior Network Engineer   |  is simple, elegant, and wrong. - HL Mencken
     GPG fingerprint = 6174 1257 129E 0D21 D8D4  E8A3 8E39 29E3 E2E8 8CEC
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