[Kea-users] ALLOC_ENGINE_V4_ALLOC_FAIL

[Conor Mullen]

Hey Ismael,

So what you are seeing here is the subnet is being defined as only
available for a specific client-class:

"pools": [ { "pool": "1.2.3.2 - 1.2.3.254", "client-class": "HA_server1" }
],

This means (as far as I understand) that specific pool in that subnet will
only be offered to dhcp requests that are tagged with that HA_server1
client-class. So unless you have a host-reservation defined somewhere that
associates your dhcp request with that "HA_server1" client-class that pool
you've set up will not be available for your request.

Client classes are great for allowing you better access control to your
subnet pools, but with your original config they'll block your requests
unless you are setting those classes in a host reservation:
https://kea.readthedocs.io/en/latest/arm/classify.html

Here's the ISC provided example I ended up using to set up reservations for
my subnets:
https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html#reserving-client-classes-in-dhcpv4

Hope that helps shed some light on how that works. Nice work
troubleshooting your way down to the issue.

All the best,
Conor Mullen



On Mon, Jul 6, 2020 at 8:34 AM Ismael Suarez <Ismael_Suarez at coqui.com>
wrote:

> Turns out, one I removed the following from each subnet (just did them all
> at once) it started giving out leases.
> "client-class": "HA_server1"
> This will not be used in cluster for now, so I can manage. But really
> don't understat why it was not working before. Any setting I am missing
> where it was hitting a default threshold?
>
> Kind of bumbed out not finding the culprit of my problem.
>
> The setting I am testing out has over 130 subnets looking like the
> following (not real IPs here)
>
>
> NOT WORKING
>         {
>             "subnet": "1.2.3.4/18",
>             "id": 1008,
>             "pools": [ { "pool": "1.2.3.2 - 1.2.3.254", "client-class":
> "HA_server1" } ],
>             "option-data": [ { "name": "routers", "data": "1.2.3.1" } ]
>         },
>
>
> WORKING
>         {
>             "subnet": "1.2.3.0/18",
>             "id": 1008,
>             "pools": [ { "pool": "1.2.3.2 - 1.2.3.254" } ],
>             "option-data": [ { "name": "routers", "data": "1.2.3.1" } ]
>         },
>
>
> NOTE: HA hook is not in use (commented).
>
> --
>
> Ism
>
>
> -----Original Message-----
> From: Joshua Schaeffer <jschaeffer at harmonywave.com<mailto:
> Joshua%20Schaeffer%20%3cjschaeffer at harmonywave.com%3e>>
> To: kea-users at lists.isc.org<mailto:kea-users at lists.isc.org>
> Subject: Re: [Kea-users] ALLOC_ENGINE_V4_ALLOC_FAIL
> Date: Fri, 03 Jul 2020 17:25:15 -0600
>
> On 7/3/20 4:48 PM, Ismael Suarez wrote:
>
> Dont have ‘client-classes’ in my config. Not using reservations. Just
> simple subnets.
>
>
> Used to have it setup in HA but now don’t. Still have de HA_server1 for
> each subnet. Think that may be bothering somehow?
>
>
> I would recommend turning on DEBUG. You will get far more information as
> to why the allocation failed, or at least be able to rule out certain
> situations.
>
> --
>
> Thanks,
>
> Joshua Schaeffer
>
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