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

Mon Sep 9 09:25:50 UTC 2024

Hi Marek,

That is one way for Kea to extract the MAC address.  See here:
https://kea.readthedocs.io/en/kea-2.6.1/arm/dhcp6-srv.html#mac-hardware-addresses-in-dhcpv6
for other ways.  It sounds like you might be relaying traffic to the
Kea server.  Perhaps check if your relay agent supports option 79
(defined in RFC 6939) so that Kea could be supplied with the real mac
address of the interface.

Thank you,
Darren Ankney

On Sun, Sep 8, 2024 at 12:52 PM Marek Greško
<marek.gresko at protonmail.com> wrote:
>
> Hello,
>
> the mac-address in dhcpv6 sense is not a real mac address. It is some extract from duid and it is not able to differentiate between the interfaces.
>
> Marek
>
>
>
>
>
> Sent with Proton Mail secure email.
>
> On Sunday, September 8th, 2024 at 14:25, Darren Ankney <darren.ankney at gmail.com> wrote:
>
> > Hi Marek,
> >
> > You could make the reservation with the hardware (mac) address of the
> > interface if the hardware address is available to the Kea server via
> > some means:
> >
> > "reservations": [
> > {
> > "hw-address": "aa:bb:cc:dd:ee:ff",
> > "ip-address": "2001:db8:ff::77"
> >
> > },
> > {
> > "hw-address": "01:02:03:04:05:06",
> > "ip-address": "2001:db8:ff::78"
> >
> > }
> > ]
> >
> > Thank you,
> > Darren Ankney
> >
> > On Sun, Sep 8, 2024 at 7:47 AM Marek Greško via Kea-users
> > kea-users at lists.isc.org wrote:
> >
> > > Thi solves completely different problem. I want two different interfaces of the same host in the same vlan to get different statically assigned ipv6 addresses. So the pair of duid and iaid should be the key to obtain lease together. The solution you describe does not guarantee I will obtain different ipv6 address. moreover it dos not allow me to specify two such interfaces in the config. Currently the kea dies on startup because of duplicate duid.
> > >
> > > Marek
> > >
> > > Sent with Proton Mail secure email.
> > >
> > > On Saturday, September 7th, 2024 at 13:48, Kevin P. Fleming lists.kea-users at kevin.km6g.us wrote:
> > >
> > > > There is already an open feature request for reservations to not be stored in the lease database; if this is implemented, after Kea completes the DHCP transaction with the client it will 'forget' about the transaction. If the client then moves to a different subnet, or different interface on the same subnet, Kea will allow the appropriate reservation to be used again because the lease database won't contain an entry for that IP address.
> > > >
> > > > On Fri, Sep 6, 2024, at 23:04, Marek Greško via Kea-users wrote:
> > > >
> > > > > Hello,
> > > > >
> > > > > is there any chance kea will support adding reservation also by IAID
> > > > > anytime soon?
> > > > >
> > > > > Thanks
> > > > >
> > > > > Marek
> > > > >
> > > > > Sent with Proton Mail secure email.
> > > > >
> > > > > On Monday, August 26th, 2024 at 11:46, Darren Ankney
> > > > > darren.ankney at gmail.com wrote:
> > > > >
> > > > > > Hi Marek,
> > > > > >
> > > > > > You might be right. I do not know. I think yes, if you need to have
> > > > > > separate reservations for the two different interfaces, then you'd
> > > > > > have to specify separate subnets. Is there any particular reason that
> > > > > > the client cannot obtain the same IP regardless of the interface that
> > > > > > is connected (surely you are not connecting both interfaces
> > > > > > simultaneously)?
> > > > > >
> > > > > > Thank you,
> > > > > > Darren Ankney
> > > > > >
> > > > > > On Sun, Aug 25, 2024 at 6:38 AM Marek Greško via Kea-users
> > > > > > kea-users at lists.isc.org wrote:
> > > > > >
> > > > > > > I am pretty convinced the ISC DHCPD was able to do it. So the only way to workaround the problem is to create separate vlan for cable connection?
> > > > > > >
> > > > > > > Marek
> > > > > > >
> > > > > > > Sent with Proton Mail secure email.
> > > > > > >
> > > > > > > On Sunday, August 25th, 2024 at 11:40, Darren Ankney darren.ankney at gmail.com wrote:
> > > > > > >
> > > > > > > > Hello Marek,
> > > > > > > >
> > > > > > > > I do not believe there is a way to assign a reservation to an IAID. I
> > > > > > > > also cannot think of a way to use multiple keys for a reservation.
> > > > > > > >
> > > > > > > > Thank you,
> > > > > > > > Darren Ankney
> > > > > > > >
> > > > > > > > On Sat, Aug 24, 2024 at 11:59 AM Marek Greško via Kea-users
> > > > > > > > kea-users at lists.isc.org wrote:
> > > > > > > >
> > > > > > > > > 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
> > > > > > > > >
> > > > > > > > > Sent with Proton Mail secure email.
> > > > > > > > >
> > > > > > > > > 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
> > > > > > > > > > > >
> > > > > > > > > > > > --
> > > > > > > > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > > > > > > > >
> > > > > > > > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > > > > > > > >
> > > > > > > > > > > > Kea-users mailing list
> > > > > > > > > > > > Kea-users at lists.isc.org
> > > > > > > > > > > > https://lists.isc.org/mailman/listinfo/kea-users
> > > > > > > > > > >
> > > > > > > > > > > --
> > > > > > > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > > > > > > >
> > > > > > > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > > > > > > >
> > > > > > > > > > > Kea-users mailing list
> > > > > > > > > > > Kea-users at lists.isc.org
> > > > > > > > > > > https://lists.isc.org/mailman/listinfo/kea-users
> > > > > > > > > >
> > > > > > > > > > --
> > > > > > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > > > > > >
> > > > > > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > > > > > >
> > > > > > > > > > Kea-users mailing list
> > > > > > > > > > Kea-users at lists.isc.org
> > > > > > > > > > https://lists.isc.org/mailman/listinfo/kea-users
> > > > > > > > > > --
> > > > > > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > > > > >
> > > > > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > > > > >
> > > > > > > > > Kea-users mailing list
> > > > > > > > > Kea-users at lists.isc.org
> > > > > > > > > https://lists.isc.org/mailman/listinfo/kea-users
> > > > > > > >
> > > > > > > > --
> > > > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > > > >
> > > > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > > > >
> > > > > > > > Kea-users mailing list
> > > > > > > > Kea-users at lists.isc.org
> > > > > > > > https://lists.isc.org/mailman/listinfo/kea-users
> > > > > > > > --
> > > > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > > >
> > > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > > >
> > > > > > > Kea-users mailing list
> > > > > > > Kea-users at lists.isc.org
> > > > > > > https://lists.isc.org/mailman/listinfo/kea-users
> > > > > >
> > > > > > --
> > > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > > > > >
> > > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > > >
> > > > > > Kea-users mailing list
> > > > > > Kea-users at lists.isc.org
> > > > > > https://lists.isc.org/mailman/listinfo/kea-users
> > > > > > --
> > > > > > ISC funds the development of this software with paid support
> > > > > > subscriptions. Contact us at https://www.isc.org/contact/ for more
> > > > > > information.
> > > > >
> > > > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > > > >
> > > > > Kea-users mailing list
> > > > > Kea-users at lists.isc.org
> > > > > https://lists.isc.org/mailman/listinfo/kea-users
> > > > > --
> > > > > ISC funds the development of this software with paid support subscriptions. Contact us at https://www.isc.org/contact/ for more information.
> > >
> > > To unsubscribe visit https://lists.isc.org/mailman/listinfo/kea-users.
> > >
> > > Kea-users mailing list
> > > Kea-users at lists.isc.org
> > > https://lists.isc.org/mailman/listinfo/kea-users