Hello!, We are proud to announce the third alpha release of what should become PowerDNS Recursor 4.5.0. This release contains various bug fixes, improvements and new features. The second alpha was an internal release only and never went public.
The upcoming 4.5.0 release includes an important addition: the
implementation of RFC 8198: Aggressive use of DNSSEC-Validated
Cache. This enables the Recursor to answer queries for
non-existing names with less effort in many cases. This feature
uses both NSEC and NSEC3 records. Additionally the DNSSEC default
mode[1] is now "process", while it was "process-no-validate"
before. This means that clients asking for it will get DNSSEC
validated answers by default.
We also added a cache of non-resolving nameservers. This enhances
performance when the Recursor encounters domains that have
nameservers that do not resolve.
This release also features a re-worked negative cache that is
shared between threads, allowing more efficient use of the cache
and reduced memory consumption.
Support for Extended DNS Errors (RFC 8914[2]) has been added. These
can be enabled by setting the extended-resolution-errors[3] setting
to 'yes', this will send DNSSEC and resolution related errors to
clients. Extended Errors are also hooked up to the Lua scripting
engine[4], allowing fine-grained setting of both the error code and
extra information in the response.
A "refresh almost expired records" (also called "refetch")
mechanism[5] has been introduced to keep the record cache warm. In
short, if a query comes in and the cached record's TTL is almost
expired (within N percent of its original value) the cached record
is served to the client and the record queried for in the
background, ensuring that new queries for that record are fresh and
served from the cache.
Other new features and improvements are:
* The complete protobuf and dnstap logging code has been
rewritten to have much smaller performance impact.
* We have introduced non-offensive synonyms for words used in
settings. See the upgrade[6] guide.
* The default minimum TTL[7] override has been changed from 0 to
1.
* The spoof-nearmiss-max setting[8]'s default has been changed to 1.
This has the consequence that the Recursor will switch to
do TCP queries to authoritative nameservers sooner as an
effective measure against many spoofing attacks.
* Incoming queries over TCP now also use the packet cache,
providing another performance increase.
* File written to by the rec_control command are new opened by
the command itself. It is also possible to write the content to
the standard output stream by using a hyphen as file name.
Please refer to the changelog[9] for additional details.
Please send us all feedback and issues you might have via the
mailing list[10], or in case of a bug, via GitHub[11].
The tarball[12] (signature[13]) is available from our download
server[14] and packages for CentOS 7 and 8, Debian Buster and
Ubuntu Bionic and Focal are available from our repository[15].
With the future 4.5.0 final release, the 4.2.x releases will be EOL
and the 4.3.x releases will go into critical security fixes only
mode. Consult the EOL policy[16] for more details.
We would also like to announce that with this release we will stop
supporting systems using 32-bit time. This includes 32-bit Linux
platforms like arm and i386 before kernel version 5.1.
We are grateful to the PowerDNS community for the reporting of
bugs, issues, feature requests, and especially to the submitters of
fixes and features.
-Otto and the PowerDNS Team.
References
1. https://docs.powerdns.com/recursor/settings.html#dnssec
2. https://tools.ietf.org/html/rfc8914.html
3.
https://docs.powerdns.com/recursor/settings.html#extended-resolution-errors
4.
https://docs.powerdns.com/recursor/lua-scripting/dq.html#DNSQuestion.extendedErrorCode
5. https://docs.powerdns.com/recursor/settings.html#refresh-on-ttl-perc
6. https://docs.powerdns.com/recursor/upgrade.html#x-to-4-5-0-or-master
7. https://docs.powerdns.com/recursor/settings.html#minimum-ttl-override
8. https://docs.powerdns.com/recursor/settings.html#spoof-nearmiss-max
9. https://doc.powerdns.com/recursor/changelog/4.5.html#change-4.5.0-alpha3
10. https://mailman.powerdns.com/mailman/listinfo/pdns-users
11. https://github.com/PowerDNS/pdns/issues/new/choose
12. https://downloads.powerdns.com/releases/pdns-recursor-4.5.0-alpha3.tar.bz2
13.
https://downloads.powerdns.com/releases/pdns-recursor-4.5.0-alpha3.tar.bz2.sig
14. https://downloads.powerdns.com/releases/
15. https://repo.powerdns.com/
16. https://docs.powerdns.com/recursor/appendices/EOL.html
--
kind regards,
Otto Moerbeek
PowerDNS Developer
Email: otto.moerb...@open-xchange.com
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Managing Board: Andreas Gauger, Carsten Dirks, Dirk Valbert, Frank Hoberg,
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Chairman of the Board: Richard Seibt
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