1) one should not manually adjust search domains in /etc/resolv.conf
2) systemd-resolved should learn about search domains
- for example, set search domains in /etc/systemd/resolved.conf if
nothing sets them on per link basis vai resolved dbus api or
networkd.network files.
3) /etc/resolv.conf should be a symlink to
../run/systemd/resolve/stub-resolv.conf
4) ../run/systemd/resolve/stub-resolv.conf should be dynamically updated by
resolved to contain the correct search domains
5) resolved does not send DNSSEC info to clients that do not support DNSSEC nor
requested a DNSSEC response
6) if you expect DNSSEC validation from responses resolved provides, please
manually enable DNSSEC in /etc/systemd/resolved.conf and all the relevant links
via systemd-resolve cmdline tool (if not managed vai networkd.network units)
** Changed in: systemd (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1717015
Title:
libc resolver stops searching domain search list after getting back
NSEC record
Status in systemd package in Ubuntu:
Incomplete
Bug description:
Suppose that:
1. you have a "search" line in your /etc/resolv.conf file;
2. it has two domains in it; and
3. the first of the two domains does DNSSEC, including returning NSEC records
for nonexisting hosts.
In this situation, when you try to look up a host name in the second
domain without specifying the domain part of the host name, the libc
resolver will stop after it gets back the NSEC record and report that
the host name doesn't exist, rather than moving on to the second
domain in the search list and searching for the host in that domain.
See also https://bugs.launchpad.net/ubuntu/+source/bind9/+bug/1717014
.
ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: libc6 2.24-9ubuntu2.2
ProcVersionSignature: Ubuntu 4.10.0-33.37-generic 4.10.17
Uname: Linux 4.10.0-33-generic x86_64
ApportVersion: 2.20.4-0ubuntu4.5
Architecture: amd64
CurrentDesktop: Unity:Unity7
Date: Wed Sep 13 16:00:45 2017
Dependencies:
gcc-6-base 6.3.0-12ubuntu2
libc6 2.24-9ubuntu2.2
libgcc1 1:6.3.0-12ubuntu2
InstallationDate: Installed on 2016-08-09 (400 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64
(20160719)
SourcePackage: glibc
UpgradeStatus: Upgraded to zesty on 2017-04-19 (147 days ago)
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