# Kea 1.6.2, February 26th 2020, Release Notes Welcome to Kea 1.6.2, a maintenance release of the 1.6 series. Kea is a DHCP implementation developed by Internet Systems Consortium, Inc. that features fully functional DHCPv4 and DHCPv6 servers, a dynamic DNS update daemon, a Control Agent (CA) that provides a REST API to control the DHCP and DNS update servers, an example shell client to connect to the CA, a daemon that is able to retrieve YANG configuration and updates from Sysrepo, and a DHCP performance-measurement tool. Both DHCP servers fully support server discovery, address assignment, renewal, rebinding, release, decline, information request, DNS updates, client classification, and host reservations. The DHCPv6 server also supports prefix delegation. Lease information is stored in a CSV file by default; it can optionally be stored in a MySQL, PostgreSQL, or Cassandra database instead. Host reservations can be stored in a configuration file, or in a MySQL, PostgreSQL, or Cassandra database. They can also be retrieved from a RADIUS server, although this functionality is somewhat limited. Kea DHCPv4 and DHCPv6 daemons provide support for YANG models, which are stored in a Sysrepo datastore and can be configured via the NETCONF protocol. This maintenance release brings in two bug fixes for problems that were considered important enough to warrant a maintenance release. If you are not affected by these issues, no upgrade is necessary. However, if you wish to deploy the latest stable Kea version, please upgrade to 1.6.2. If you are interested in the latest development releases with new features, please look at the 1.7.x series. 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 issues were fixed since 1.6.1: 1. **Subnet options are not being loaded from the config database for all subnets**. Corrected an issue in the MySQL CB hook library which could, under certain conditions, cause subnet and shared-network options, properly added to the CB database, to be discarded when fetched from the backend. (#1110) 2. **Better option 43 handling for Cisco Meraki Routers** Modified vendor encapsulated option (option 43) parsing to interpret sub-option codes 0 and 255 as PAD and END when no sub-option with these codes are defined. This adds control of illegal but common use of these reserved code points in option 43. One particular hardware type known to work better with this change are Cisco Meraki routers, but there may be other hardware that could benefit from this fix. (#1111) 3. **ACK response to DHCPINFORM now contains client supplied ciaddr**. This small change may improve compatibility with clients that use DHCPINFORM. (#1112) 4. **Graceful shutdown due to DB failure**. Kea servers now detect and remove orphaned control channel sockets. This corrects a failure of the servers to restart with an error of "address already in use" following a fatal loss of database connectivity. Also, Kea servers now shutdown gracefully, if connectivity with a backend database has been lost and retries are either disabled or have been exhausted. Prior to this they simply invoked exit() which could orphan control socket files or cause segfaults unloading the CB Cmds hook library. (#1113, #1114). ## License This version of Kea is released under the Mozilla Public License, version 2.0. https://www.mozilla.org/en-US/MPL/2.0 The premium and subscriber-only hooks libraries are provided in source code form, under the terms of an End User License Agreement (you will get the source code that you can modify freely, but you are not permitted to redistribute it). ## 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 via https://kb.isc.org/docs/kea-administrator-reference-manual in HTML, plain text, or PDF 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 and DHCP 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 upgrade notes since the previous release (1.6.1). ``` 1665. [bug] tmark Modified option 43 parsing to interpret sub-option codes 0 and 255 as PAD and END when no sub-option with these codes are defined. This adds control of illegal but common use of these reserved code points in option 43. (Gitlab #1111,#950) 1664. [bug] tmark Corrected an issue in the MySQL CB hook library which could cause subnet and shared-network options, properly added to the CB database, to be discarded when fetched from the backend. (Gitlab #1110,#1093) 1663. [func] tmark Client supplied ciaddr is now sent back when responding to DHCPINFORM (Gitlab #1112,#992) 1662. [bug] tmark kea-dhcp4 and kea-dhcp6 now shutdown gracefully by executing the shutdown command, if connectivity with a backend database has been lost and retries are either disabled or have been exhausted. Prior to this they simply invoked exit() which could orphan control socket files or cause segfaults unloading the CB Cmds hook library. (Gitlab #1114,#1108) 1661. [bug] tmark Kea servers now detect and remove orphaned control channel sockets. This corrects a failure of the servers to restart with an error of "address already in use" following a fatal loss of database connecivity. (Gitlab #1113,#1097) ``` Thank you again to everyone who assisted us in making this release possible. We look forward to receiving your feedback.