[Kea-users] IPV6 client gets the wrong IP for sometime after a reboot

[Darren Ankney]

The trouble is that the server has no way to know it’s the same client if the DUID is unstable.  If the mac address is available, you can assign a reservation based on that.  Then it wouldn’t matter what DUID the client provides.  This is the same behavior as in ISC DHCP concerning DHCPv6.  It is defined in RFC 8415.  Basically: The DUID must be present and the client must use the same DUID.  The server must use that as the identifier to assign leases.

> On Jan 17, 2023, at 6:18 AM, Veronique Lefebure <Veronique.Lefebure at cern.ch> wrote:
> 
> Waw. The client behaviour is not under control of the DHCP server admins..
> This is a behaviour different from the ISC DHCP server behaviour, right ?
> From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of Kevin P. Fleming <lists.kea-users at kevin.km6g.us>
> Sent: Tuesday, January 17, 2023 12:00 PM
> To: kea-users at lists.isc.org <kea-users at lists.isc.org>
> Subject: Re: [Kea-users] IPV6 client gets the wrong IP for sometime after a reboot
>  
> On Tue, Jan 17, 2023, at 04:54, Veronique Lefebure wrote:
>> Hi,
>> 
>> I have observed that an IPV6 client gets the wrong IP when it reboots.
>> See detailed logs below.
>> The problem seems to be due to the fact the DUID of the client changes after reboot.
>> Anyone else has observed the same ?
>> How to go around that and make sure that the client gets the correct IP straightaway after reboot ?
> 
> You'll need to find a way to configure the client to use a stable DUID if you want it to be given a lease from a host reservation.
> 
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