# Kea 2.5.0 Release Notes, July 26th 2023 Welcome to Kea 2.5.0, the first monthly release of the 2.5 development series. As with any other development release, use this with caution: development releases are not recommended for production use. 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. The following bugfixes and features have been implemented since the previous release, version 2.4.0: 1. **Bulk Leasequery (BLQ)**. Empty relay ID and remote ID options in BLQ requests are now properly treated as malformed, and are met with a reply containing a proper message [#2906]. The by-link address query has been implemented for DHCPv6. The new command `extended-info6-upgrade` upgrades old DHCPv6 leases from the lease database to be visible by Bulk Leasequery. This one-time operation is useful for users who want to start using BLQ immediately and cannot wait for the normal lease renewal process to gradually fill in the data [#2869]. 2. **Database improvements**. We fixed a crash that could happen when Kea, linked with `libmysqlclient`, reconnected to the MySQL database during the execution of an SQL statement [#2792]. ## Incompatible Changes 1. **MySQL and PostgreSQL schema updates**. Both database schemas were updated to accommodate Bulk Leasequery support in DHCPv6. 2. **DDNS parameter deprecation**. The boolean `ddns-use-conflict-resolution` global parameter has been deprecated. The new enum parameter `ddns-conflict-resolution-mode` takes its place. 3. **Packages**. Packages for EL7 distributions, e.g. CentOS 7 and RHEL 7, are no longer built for Kea in Cloudsmith, following its deprecation in Kea 2.4.0. Kea is officially no longer tested on these systems. 4. **Minimum C++ standard**. Kea must now be built under the C++14 standard or later; the previous minimum required standard was C++11. Compilation under the C++11 standard or prior may now fail. ## 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/ 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 2.4.0 release. 2170. [build] fdupont Moved from C++ 11 to C++ 14 as the minimal C++ version which must be supported by the C++ compiler tobuild Kea. (Gitlab #2876) 2169. [bug] marcin Applied a workaround in the connection to MySQL that prevents potential crashes in libmysqlclient library when connection to the database is lost and re-established. (Gitlab #2792) 2168. [func] fdupont Cross-reference tables to bind relay and remote identifiers from extended info of DHCPv6 leases were added to SQL backends. A new command "extended-info6-upgrade" (re)builds these tables making leases visible to Bulk Lease Queries. (Gitlab #2869) 2167. [func] tmark The kea-dhcp<4/6> parameter, ddns-use-conflict-resolution, has been deprecated and replaced with ddns-conflict-resolution-mode. The new parameter supports four modes of behavior pertaining to DDNS update conflict resolution: check-with-dhcid, no-check-with-dhcid, check-exists-with-dhcid, and no-check-without-dhcid. Thanks to Shawn Routhier from Infoblox for contributing the patch to implement this feature. (Gitlab #2276) The following summarizes changes in the premium hook libraries since the 2.4.0 release: 177. [func] fdupont Bulk Lease Query now detects and logs empty relay or remote id values in received queries. (Gitlab #2906) 176. [func] fdupont Cross-reference tables to bind relay and remote identifiers from extended info of DHCPv6 leases were added to SQL backends. A new command "extended-info6-upgrade" (re)builds these tables making leases visible to Bulk Lease Queries. (Gitlab #2869) Thank you again to everyone who assisted us in making this release possible. We look forward to receiving your feedback.