[Kea-announce] Kea 1.6.1 is now available

Cathy Almond cathya at isc.org
Wed Nov 20 22:55:00 UTC 2019

Today ISC is pleased to announce the release of Kea 1.6.1, a maintenance
update of our production branch Kea 1.6

The new release is available from our website:

Or directly from our downloads server:

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 1.6.1.

If you are interested in the latest development releases with new
features, please look at the 1.7.x series.

 The following issues were fixed since 1.6.0:

1. **Better handling of packets with malformed hostnames**. Null
characters are not allowed in the hostname. However, Kea 1.6.0 was
overly strict about that and dropped the whole packet if a null
character was detected. As a result, slightly misconfigured or buggy
clients were completely refused service. This check has been loosened;
Kea now ignores just the faulty hostname option and attempts to process
the packet. As a result, even buggy or misconfigured clients are able to
get service. This fix is of interest only to users who experience
clients sending malformed hostnames (#900).

2. **Improved support for backup servers in HA configuration**. Kea
1.4.0 introduced High Availability mode with an optional capability to
send lease updates to a third backup server. It was recently discovered
that under special circumstances (initial traffic being serviced by the
primary server, followed by more than 30 seconds of inactivity), the
backup server could close the connection. The primary server would enter
a "confused" state where it believed there was data to be received from
the backup server, but the connection was broken. In effect, the primary
server would enter a busy loop, resulting in 100% CPU utilization and
general unresponsiveness to DHCP traffic and API commands. This bug has
been fixed. This problem affects only users who use HA configuration
with an additional backup server and periods of inactivity. (#964).

Cathy Almond
ISC Support

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