[Kea-users] Prevent lease storage for some subnets

Wed Jul 21 20:21:13 UTC 2021

I assume what OP is talking about is the same behavior from ISC DHCP where "fixed-address" did not store a lease so any device that matched the conditions could get the IP.

----- Original Message -----
> From: "Anders Rosendal" <anders at rosendal.nu>
> To: dp-web4 at dpotter.com
> Cc: "kea-users" <Kea-users at lists.isc.org>
> Sent: Wednesday, July 21, 2021 4:09:11 PM
> Subject: Re: [Kea-users] Prevent lease storage for some subnets

> Hi
> Only a user myself, and have not read if this is possible, although I totally
> agree it's a good idea.
> In an ISP environment it's fairly common to have /30 or /31 ptp-links for mgmt
> of cpe's. For these scenarios I have seen a few inhouse build solutions which
> do what we call "gi+1", i.e. when a discover/request comes in just reply with
> adding "1" to the gi-address of the request.
> With this solution autoconfiguration of equipment can be performed, also if the
> access network allows the IP can be configured statically during initial
> autoconfiguration.

> If this feature is not available, I do think it would be a useful addition.

> Regards Anders R

> On Sat, 17 Jul 2021 at 14:31, < [ mailto:dp-web4 at dpotter.com |
> dp-web4 at dpotter.com ] > wrote:

>> Hi all.

>> Our network has a lot of /30 and /31 subnets, designed for a single
>> device on a single switchport. So our kea configuration includes lots of
>> subnets with only 1 address in the DHCP pool. We currently issue
>> addresses using the DHCP relay address, and this works very well.

>> But we have some mobile devices that move from port to port, and they
>> occasionally cannot receive an address because the last device to attach
>> to that switchport is still holding the lease.

>> We would like to configure kea to prevent it from storing leases for
>> these subnets: if another device attaches to that switchport, we'd like
>> kea to re-issue the address. (Note that we also have some traditional
>> networks, and we prefer kea to record and track leases normally for
>> those subnets).

>> Is this behavior currently supported? Or will it require new
>> development or external integration to remove the lease from the
>> database?

>> Thank you,
>> David Potter
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