We’re proud to announce version 4.2.0 for the PowerDNS Recursor 4.2 release train.
The 4.2.0 release of the PowerDNS Recursor brings a lot of small, incremental changes over the 4.1.x releases. We expect little operational impact when upgrading from 4.1.x. However, several new features have been implemented and some features have changed.
This release was made possible by contributions from: Gibheer, cclauss, Aki Tuomi, Ruben, Doug Freed, Richard Gibson, Peter Gervai, Oli, Josh Soref, Rens Houben, Kirill Ponomarev, Kees Monshouwer, Matt Nordhoff, OSSO B.V., phonedph1, Rafael Buchbinder, Ruben Kerkhof, spirillen, Tom Ivar Helbekkmo and Chris Hofstaedtler. Thanks!
DNS Flag Day
The 4.2.0 release of the PowerDNS Recursor removes several workarounds for authoritative servers that respond badly to EDNS(0) queries. This is part of a multi-vendor effort known as DNS flag day to move the DNS ecosystem forward by being less lenient on non-conforming implementations.
This release adds support for DNS X-Proxied-For (draft-bellis-dnsop-xpf-04). This technique is roughly equivalent to HTTP’s X-Forwarded-For header, it can communicate the IP address and port of the original requestor from a loadbalancer/frontend (like dnsdist) to the backend server. This can allow the backend server to make decisions regarding that specific client. XPF is disabled by default and can be enabled by setting the
xpf-allow-from setting to the source IP address of the front-end proxy and setting
xpf-rr-code to the code of the resource record used by the frontend.
EDNS Client Subnet Improvements
More granularity has been added for the users of EDNS Client Subnet. The new
ecs-add-for setting can be set to a list of netmasks for which the requestor’s IP address should be used as the EDNS Client Subnet for outgoing queries. For IP addresses not on this list, the PowerDNS Recursor will use the
ecs-scope-zero-address instead, which matches the behavior of 4.1.x. Valid incoming ECS values from use-incoming-edns-subnet are not replaced.
New and Updated Settings
Sites that process large numbers of queries per second (100k+), may benefit from the new
distributor-threads setting. This can be used in combination with
pdns-distributes-queries=yes to spawn multiple threads that will pick up incoming queries and distribute them over the worker threads.
For several statistics, the PowerDNS Recursor uses a public suffix list to group queries. Before, this list was built into the binary and only updated for every release. This release adds the
public-suffix-list-file setting that allows operators to supply their own public suffix list. This option is unset by default, which means the built-in list is used.
Over the last years it has become clear that many networks on the internet lose large UDP packets, leading to authoritative servers being seen as dead from the recursor’s perspective. To ensure return packets from authoritative servers have a better chance of reaching the recursor, the
edns-outgoing-bufsize setting’s default has changed from 1680 to 1232. 1232 was chosen because it is the largest DNS response that can be carried on an IPv6 link with the IPv6 minimal MTU (1280). In tandem with this change, the
udp-truncation-threshold that decides when to truncate responses to clients has also been changed from 1680 to 1232.
Changes since release candidate 2
There have been some minor changes since release candidate 2:
- #8074: Make sure we always compile with BOOST_CB_ENABLE_DEBUG set to 0
- #8052: Limit compression pointers to 14 bits
- #8009: Fix the export of only outgoing queries or incoming responses
- #8005: Clear CMSG_SPACE(sizeof(data)) in cmsghdr to appease valgrind
Please see the changelog for details.
Starting with this release, we intend to move to 6 month release cycles. This means the next release of PowerDNS recursor (4.3) is scheduled for January 2020. We will support a release for two cycles (one year). After that, a release will only get security fixes for one more cycle and then move to end of life status. Starting with the upcoming releases, our other two open source products dnsdist and the authoritative server will also move to a 6 month cycle with the same support periods.
Specific information can be found in the end of life statement.
The tarball (signature) is available at downloads.powerdns.com and packages for CentOS 6 and 7, Debian Stretch and Buster, Ubuntu Xenial and Bionic are available from repo.powerdns.com. We no longer build Debian Jessie and Ubuntu Trusty packages.
We would like to thank the PowerDNS community for continued support, feedback, bug fixes and submitted features.