[Kea-users] Problem with ip address range in subnets

[Darren Ankney]

Hi Jörg,

> I suppose Kea treats all 192.168.x.y addresses as a class C (/24)  without looking for the netmask on the interface.

It doesn't look at the interface, but it treats the subnet the way it
was defined.  For example:

"subnet": "192.0.2.0/24",

would result in a 255.255.255.0 netmask being sent to the client but:

"subnet": "192.0.2.0/23",

would result in a 255.255.254.0 netmask being sent to the client.

Thank you,
Darren Ankney

On Mon, Nov 4, 2024 at 3:04 AM Hartmann, Jörg
<Joerg.Hartmann at lrh.sachsen-anhalt.de> wrote:
>
> Hello Darren,
>
> your advice was right.
> Also i found an  old mail on the list by Tomek Mrugalski from Aug 2016 where he recommends just the same solution.
> I suppose Kea treats all 192.168.x.y addresses as a class C (/24)  without looking for the netmask on the interface.
> After including "interface": "enp1s0"  in the subnet config it works like i expected.
> Thanks for your help!
>
> regards
> Jörg
>
> --
> Mit freundlichen Grüßen
> im Auftrage
>
> Jörg Hartmann
> Referat P2 / IT-Stelle
> Landesrechnungshof Sachsen-Anhalt
> 06844 Dessau-Roßlau, Kavalierstraße 31
> Tel. +49 340 2510 404
>
> -----Ursprüngliche Nachricht-----
> Von: Kea-users <kea-users-bounces at lists.isc.org> Im Auftrag von Darren Ankney
> Gesendet: Donnerstag, 31. Oktober 2024 09:50
> An: Kea user's list <kea-users at lists.isc.org>
> Betreff: [EXTERN] Re: [Kea-users] Problem with ip address range in subnets
>
> Hi Jôrg,
>
> You might be able to overcome this by using the interface parameter.
>
> "interface": "eth0",
>
> added to the subnets that are each on the interface might help, but I've never personally tested assigning multiple subnets to the same interface.  It may be that the wrong subnet mask will be computed and sent to the client as well since these subnets do not match what is configured on the interface, it seems.
>
> Thank you,
> Darren Ankney
>
> On Wed, Oct 30, 2024 at 9:41 AM Sten Carlsen <stenc at s-carlsen.dk> wrote:
> >
> >
> > Thanks
> >
> > Sten
> >
> > On 30 Oct 2024, at 14.24, Kevin P. Fleming <lists.kea-users at kevin.km6g.us> wrote:
> >
> > On Wed, Oct 30, 2024, at 07:58, Hartmann, Jörg wrote:
> >
> > The error message is "no suitable subnet configured for a direct client".
> > If i give the cisco phones a part of 192.168.22.0 they get IPs to. So it's a probably an error with the netmask which i dont understand.
> > The server has 192.168.22.0/23 so 192.168.23.0/24 should be part of his address range.
> > Could someone pls explain why the server dont distributes IPs from 192.168.23.0 ?
>
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