We are proud to announce the first alpha release of PowerDNS Recursor 4.6.0.
Compared to the previous major (4.5) release of PowerDNS Recursor, this release contains two major sets of changes:
- a rewrite of the outgoing TCP code, adding both re-use of connections and support for DoT to authoritative servers or forwarders,
- many improvements in the area of metrics: more metrics are collected and more metrics are now exported in a Prometheus friendly way.
Re-use of TCP/DoT connections is achieved by not closing connections, leaving them open for re-use. Previously, a TCP connection would be closed after a single query-reply exchange. The policy used to keep idle connections open is governed by various settings.
By default, if a forwarder is specified using port 853, DoT will be used to connect to that forwarder. It is also possible to list specific nameservers that should be contacted over DoT. Note that no certificate validation is done. After the standard committees define discovery of authoritative servers offering DoT, we will add functionality to allow automatic switching to DoT including validation of certificates.
As always, there are also many smaller bug fixes and improvements, please refer to the changelog for additional details.
With the final 4.6 release, the 4.3.x releases will be EOL and the 4.4.x and 4.5.x releases will go into critical fixes only mode. Consult the EOL policy for more details.
We would also like to mention that with the 4.5 release we stopped supporting systems using 32-bit time. This includes 32-bit Linux platforms like arm6, arm7, and i386.
We are grateful to the PowerDNS community for the reporting of bugs, issues, feature requests, and especially to the submitters of fixes and implementations of features.