# Kea 2.4.1 Release Notes, November 29, 2023

Welcome to Kea 2.4.1, a maintenance release of the stable 2.4 series.

Kea is a DHCP implementation developed by Internet Systems Consortium 
(ISC) that features DHCPv4 and DHCPv6 servers with DNS update and a REST 
API; optional database support (MySQL and PostgreSQL); optional RADIUS, 
Kerberos, YANG/NETCONF, and GSS-TSIG support; and much more. Kea 
provides extensive management capabilities, including but not limited 
to: TLS support, Role-Based Access Control, run-time configuration 
monitoring and updates via a REST API, host reservations, and client 
classification.

The text below references issue numbers. For more details, visit the Kea 
GitLab page at https://gitlab.isc.org/isc-projects/kea/-/issues. For 
details about Docker issues, visit the page at 
https://gitlab.isc.org/isc-projects/kea-docker/-/issues/. For details 
about packaging, visit the page at 
https://gitlab.isc.org/isc-projects/kea-packaging/-/issues/.

Fixes for the following bugs have been implemented since the previous 
release, version 2.4.0:

1. **Race condition in FLQ**: The Free Lease Queue (FLQ) allocator is 
now thread-safe. It suffered from a race condition which could result in 
kea-dhcp4 crashing [#3143].
2. **Interface redetection regression**: Interface redetection governed 
by the "re-detect" configuration flag, which is enabled by default, 
stopped working with the 2.3.6 release. It is now working again as of 
version 2.4.1 [#3145].
3. **Minor hammer update**: A minor change to hammer, our build tool, 
was introduced to fix issues with building the 2.4 branch on our test 
farm [#3148].

## Incompatible Changes

None.

## License

This version of Kea is released under the Mozilla Public License, 
version 2.0.

https://www.mozilla.org/en-US/MPL/2.0

Some Kea hook libraries are provided under the MPL 2.0; others are 
licensed with the Kea Hooks Basic Commercial End User License. The 
source for each hook library includes the applicable license.

## Download

Pre-built ISC packages for current versions of the most popular Linux 
operating systems are available at:

https://cloudsmith.io/\~isc/repos/

Pre-built Docker images and well as Docker files are available. For 
details, see:

https://gitlab.isc.org/isc-projects/kea-docker

The Kea source and PGP signature for this release may be downloaded from:

https://www.isc.org/download

The signature was generated with the ISC code-signing key, which is 
available at:

https://www.isc.org/pgpkey

ISC provides detailed documentation, including installation instructions 
and usage tutorials, in the Kea Administrator Reference Manual. 
Documentation is included with the installation or at 
https://kea.readthedocs.io/en/latest/index.html in HTML, PDF, or EPUB 
formats. ISC maintains a public open source code tree, wiki, issue 
tracking system, milestone planner, and roadmap at 
https://gitlab.isc.org/isc-projects/kea.

Limitations and known issues with this release can be found at 
https://gitlab.isc.org/isc-projects/kea/-/wikis/known-issues-list.

We ask users of this software to please let us know how it worked for 
you and what operating system you tested on. Feel free to share your 
feedback on the Kea Users mailing list 
(https://lists.isc.org/mailman/listinfo/kea-users). We would also like 
to hear whether the documentation is adequate and accurate. Please open 
tickets in the Kea GitLab project for bugs, documentation omissions and 
errors, and enhancement requests. We want to hear from you even if 
everything worked.

## Support

Professional support for Kea is available from ISC. We encourage all 
professional users to consider this option; Kea maintenance is funded 
with support subscriptions. For more information on ISC's Kea software 
support, see https://www.isc.org/support/.

Free best-effort support is provided by our user community via a mailing 
list. Information on all public email lists is available at 
https://www.isc.org/community/mailing-list. If you have any comments or 
questions about working with Kea, please share them to the Kea Users 
list (https://lists.isc.org/mailman/listinfo/kea-users). Bugs and 
feature requests may be submitted via GitLab at 
https://gitlab.isc.org/isc-projects/kea/-/issues.

## Changes

The following summarizes changes and important upgrades since the 
previous release, version 2.4.0.

2169.	[build]		razvan
	The library version numbers have been bumped up for the Kea 2.4.1
	stable release.
	(Gitlab #3153)

2168.	[bug]		andrei
	Fixed interface redetection which had stopped working since
	Kea 2.3.6.
	(Gitlab #3017, #3145)

2167.	[bug]		razvan
	Fixed a race condition in free lease queue allocator.
	(Gitlab #3111, #3143)

There were no changes to the hook libraries, but please update hook 
libraries to the 2.4.1 version when updating your core application(s).

Thank you again to everyone who assisted us in making this release 
possible.

We look forward to receiving your feedback.