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Today's Topics:
1. Re: kea-dhcp4 behaviour question client-class vs reservations
(Jan-Philipp Snizek)
----------------------------------------------------------------------
Message: 1
Date: Tue, 7 May 2024 11:44:35 +0000
From: Jan-Philipp Snizek <jan-philipp.sni...@business.uzh.ch>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: kea-dhcp4 behaviour question client-class vs reservations
Message-ID:
<zrap278mb0756817fe0f7ed0552a8c1cc82...@zrap278mb0756.chep278.prod.outlook.com>
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Hi Darren
So, if the client belongs to client-class A and all members of client-class A
are restricted to pool B then the client will get an IP address from pool B.
Unless, a reservation for the MAC address of that client is defined. Then, the
reservation has precedence. The properties of client-class A still apply to the
client.
Is that correct? This is what I observe with the given config example.
Thanks,
Philipp
From: dhcp-users <dhcp-users-boun...@lists.isc.org> on behalf of Darren Ankney
<darren.ank...@gmail.com>
Date: Tuesday, 7 May 2024 at 08:51
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: kea-dhcp4 behaviour question client-class vs reservations
Hi Philipp,
The keyword "client-class" restricts access to the pool to members of
the class. It does not assign members of a class to a pool. See
here:
https://kea.readthedocs.io/en/kea-2.4.1/arm/classify.html#configuring-pools-with-class-information
where it says "Similar to subnets, in certain cases access to certain
address or prefix pools must be restricted to only clients that belong
to a given class, using the client-class when defining the pool.".
Thank you,
Darren Ankney
On Fri, Apr 26, 2024 at 5:05?AM Jan-Philipp Snizek
<jan-philipp.sni...@business.uzh.ch> wrote:
>
> Hi
>
> I would like to ask a question regarding precedence behavior of kea-dhcp4.
>
> Let's take this working config:
>
> "client-classes": [
> {
> "name": "pxeclientx64",
> "test": "option[60].text == 'PXEClient:Arch:00007:UNDI:003016'",
> "option-data": [
> { "name": "vendor-encapsulated-options", "always-send": false
> },
> { "name": "boot-file-name", "data":
> "SMSBoot\\x64\\wdsmgfw.efi" },
> { "name": "tftp-server-name", "code": 66, "data":
> "my-tftp-server.domain.local" }
> ]
> }
> ],
> "subnet4": [
> {
> "id": 1,
> "subnet": "172.20.19.0/24",
> "next-server": "172.20.19.1",
> "pools": [
> { "pool": "172.20.19.120 - 172.20.19.129" },
> { "pool": "172.20.19.130 - 172.20.19.139",
> "client-class": "pxeclientx64" }
> ],
> "reservation-mode": "out-of-pool",
> "reservations": [
> { "hostname": "pxeboot1", "hw-address": "00:e0:4c:68:0a:f1",
> "ip-address": "172.20.19.150" }
> ],
> "option-data": [
> { "name": "routers", "data": "172.20.19.1" }
> ]
> }
> ],
>
> If the client with the reservation executes a PXE boot it gets the reserved
> IP .19.150 and successfully boots PXE.
> The kea-dhcp4 log looks like this:
> Apr 25 13:53:17 hellbox kea-dhcp4[16858]: INFO EVAL_RESULT Expression
> pxeclientx64 evaluated to 1
> Apr 25 13:53:17 hellbox kea-dhcp4[16858]: INFO DHCP4_LEASE_ADVERT [hwtype=1
> 00:e0:4c:68:0a:c1], cid=[no info], tid=0x2223e0e3: lease 172.20.19.150 will
> be advertised
> Apr 25 13:53:20 hellbox kea-dhcp4[16858]: INFO EVAL_RESULT Expression
> pxeclientx64 evaluated to 1
> Apr 25 13:53:20 hellbox kea-dhcp4[16858]: INFO DHCP4_LEASE_ALLOC [hwtype=1
> 00:e0:4c:68:0a:c1], cid=[no info], tid=0x2223e0e3: lease 172.20.19.150 has
> been allocated for 3600 seconds
> As we can see both matches: pxeclientx64 and the reservation. The client
> successfully boots pxe.
> I don't understand why the client successfully pxe boots. The client-class
> "pxeclientx64" is assigned to a pool. It is neither assigned to the subnet4 {
> id: 1 } subnet declaration nor to the reservation.
> What has precedence over what? How does inheritance work in kea?
>
> Thanks,
>
> --
>
> Philipp
>
> --
> ISC funds the development of this software with paid support subscriptions.
> Contact us at https://www.isc.org/contact/ for more information.
>
> dhcp-users mailing list
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