[Kea-users] KEA subnet client reservation error

[Frey, Rick E]

Don’t know that it would impact host reservations but Kea uses a subnet identifier for associating leases to a given subnet.   If the subnet identifier is not specified (“id” parameter), Kea will auto generate the id based upon order of the subnets in the config.   Thus, if order is changed the id of a given subnet could change.

I specify the “id” for each subnet to avoid such renumbering with changes to subnets in config.

See https://kea.readthedocs.io/en/latest/arm/dhcp4-srv.html#ipv4-subnet-identifier


From: Kea-users <kea-users-bounces at lists.isc.org> on behalf of Bohnenberger, Mark <mark.bohnenberger at bechtle.com>
Date: Wednesday, August 31, 2022 at 1:30 AM
To: kea-users at lists.isc.org <kea-users at lists.isc.org>
Subject: [Kea-users] KEA subnet client reservation error
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.

Good morning together,

last week I did a configuration change on a 2.0.0 KEA server and adding more subnets for DHCP addressing (as I did before). After adding new subnets after the already configured subnets, everything was working fine. Then I added new subnets before the already configured subnets in the config file and then the DHCP server is ignoring the configured DHCP reservations fort he clients. So the DHCP server was giving clients, which have a reservations in the config, a new DHCP lease and a new IP address. I tested the configuration on a test system and I was not recieving any error when I start the DHCP server, so there was no configuration error and same result on the live system. The DHCP service itself and the DHCP addressing is also working fine. Only the reservations were not work anymore. I did some tests and I can reproduce that error on the test system.

So my question are now, ist tehre a command for reordering the subnet configuration or for re-reading/rebuilding the subnet configuration on the DHCP server? Or does anyone have the same error?

The system is a Ubuntu 20 with KEA 2.0.0 in an HA setup. The configuration is config file and the leases are saved on a MySQL database.

########### New added subnet with problems
{
                "subnet": "10.8.1.0/24",
                "comment": "NEWNET",
                "pools": [ { "pool": "10.8.1.20 - 10.8.1.239" } ],
                "option-data": [
                               {
                               "name": "routers",
                               "data": "10.8.1.1"
                               }
                ]
},

########### Already configured subnet
{
                "subnet": "10.8.12.0/24",
                "comment": "FAKENET",
                "pools": [ { "pool": "10.8.12.20 - 10.8.12.239" } ],
                "reservations": [
                               {
                                               "hw-address": "12:34:56:78:90",
                                               "ip-address": "10.8.12.36",
                                               "hostname": "FAKENAME"
                               }
                ],
                "option-data": [
                               {
                               "name": "routers",
                               "data": "10.8.12.1"
                               }
                ]
},

########### New added subnet without problems
{
                "subnet": "10.8.1.0/24",
                "comment": "NEWNET",
                "pools": [ { "pool": "10.8.1.20 - 10.8.1.239" } ],
                "option-data": [
                               {
                               "name": "routers",
                               "data": "10.8.1.1"
                               }
                ]
},

Regards

Mark




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