[Kea-users] reservation for the same host in several subnets

[Marek Greško]

Hello,

yes I understand that perfectly what DUID and IAID is. But what is IAID for, when I cannot match on it? I suspect it is kea limitation, not dhcp6. Am I right?

I would expect having machine with DUID A and IAIDs I1 and I2 having reservations for (A,I1)=>addr1 and (A,I2)=>addr2 to both interfaces receive the correct IPv6 address by respective reservations. Currently I even cannot start kea-dhcp6 when creating such reservations since kea complains about duplicate DUID.

I just found out that there is also one fault on my side. When I migrated to kea I migrated also the script generating the configuration file from the table. And since I did not found a way to specify IAID I commented this part and I forgot about it. But I still do not know what is the name of the IAID in kea. I suspect kea does not support matching on IAIDs. Or does it? If yes what is the name of the option in the reservation?

Thanks

Marek




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On Friday, August 23rd, 2024 at 7:19, Marek Greško via Kea-users <kea-users at lists.isc.org> wrote:

> Hello,
> 
> is it a limitation of kea or of the dhcp6 protocol? What is IAID then for? The IAIDs are different.
> 
> If I add hwaddress as a key, I suspect it is not real harware address but rather some hw-address part from the DUID so it is the same for all interfaces. Am I right?
> 
> So it seems I will have to create new vlan with the same purpose. What I would like to achieve is to have the host to be able to connect using either the cable or wifi. Both have the reservation (different ipv6 address).
> 
> Thanks
> 
> Marek
> 
> 
> 
> 
> Sent with Proton Mail secure email.
> 
> 
> On Friday, August 23rd, 2024 at 2:29, Darren Ankney darren.ankney at gmail.com wrote:
> 
> > Hi Marek,
> > 
> > I do not think you are going to be able to have two reservations for
> > the same DUID in the same subnet or shared-network. You might be able
> > to set one for DUID and the other for hw-address if that is available
> > to Kea, however.
> > 
> > Thank you,
> > Darren Ankney
> > 
> > On Thu, Aug 22, 2024 at 8:22 AM Marek Greško via Kea-users
> > kea-users at lists.isc.org wrote:
> > 
> > > Hello,
> > > 
> > > sorry, probably different problem here:
> > > 
> > > I just realized, in the second vlan I have another definition for different interface of the host (same DUID, but different IAID). Probably the conflict it this one.
> > > 
> > > Is it possible to have these two enrties? I would need it.
> > > 
> > > Thanks
> > > 
> > > Marek
> > > 
> > > On Thursday, August 22nd, 2024 at 14:17, Marek Greško via Kea-users kea-users at lists.isc.org wrote:
> > > 
> > > Hello,
> > > 
> > > I am running a kea-2.6.1 server. I want one of the hosts to be roaming, i. e. to be able to connect by the network cable to two different vlans by selecting the plug.
> > > 
> > > I am able to setup it for ipv4, but for ipv6 I get error: failed to add new host using the D
> > > UID ...... to the IPv6 subnet id <my id> as this host has already been added. The DUID and IAID is the same as for the same host in different subnet.
> > > 
> > > I tried to set "early-global-reservations-lookup": false, but it had not help much.
> > > 
> > > How can I achieve this goal? I would expect reservations table are independent for different subnets.
> > > 
> > > Thanks
> > > 
> > > Marek
> > > 
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