[Bug 1862437] Re: Ubuntu 16.10 & later, & derivatives do not query the assigned DNS server

[Bruce Goodman]

My sincere apologies, I have been wasting your time !

The Ubuntu and derivatives distributions that use systemd-resolved do
indeed query the assigned DNS.   I verified  this by stopping the
DNSMASQ service, which resulted in the loss of external name resolution.
Turning the service on again restored resolution of internet domain
names.

There is still an issue in distributions using systemd-resolved with
resolution of LAN host names.   As shown above resolution of a simple
host name, in my examples BGOWIKI01v, fails.   But when I add a 2nd name
for that host to the /etc/hosts file on my DNSMASQ machine, with a
suffix that looks like a domain name, like BGOWIKI01v.somedomain.local I
can resolve the name correctly using the nslookup command.

The solution for my reported issue will be to migrate my home LAN away
an old-fashioned Workgroup model, to something that looks like a domain.


Regards
Bruce Goodman

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https://bugs.launchpad.net/bugs/1862437

Title:
  Ubuntu 16.10 & later, & derivatives do not query the assigned DNS
  server

Status in bind9 package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  Starting Ubuntu 16.10 resolution of LAN addresses fails.   This name
  resolution failure is evident in every post 16.0 Ubuntu & derivative
  that I have tested.   See below - which shows 16.04 resolves, 18.04
  and Pop!_OS 19.04 fail, and other distros - Fedora 31, openSUSE Leap
  15.1, and Debian GNU/Linux 10 (buster) - all resolve as expected.

  == Test Case ==
  $ name=$(hostnamectl | grep "Static hostname:" | cut -d: -f2 | xargs)
  $ echo "${name}"
  $ hostnamectl | grep System
  $ hostnamectl | grep Kernel
  $ nmcli dev show | grep DNS
  $ nslookup "${name}"

  == Additional Information ==
  Operating System: Ubuntu 16.04.6 LTS
             Kernel: Linux 4.4.0-170-generic
   IP4.DNS[1]:                             192.168.3.2
   Server:        127.0.1.1
   Address:   127.0.1.1#53
   Name:  BGOWIKI01v
   Address: 192.168.3.60
   ============================================================================
   Operating System: Ubuntu 18.04.3 LTS
              Kernel: Linux 4.15.0-72-generic
   IP4.DNS[1]:                             192.168.3.2
   Server:        127.0.0.53
   Address:   127.0.0.53#53
   ** server can't find BGOWIKI01v: SERVFAIL
   ============================================================================
   Operating System: Pop!_OS 19.04
              Kernel: Linux 5.0.0-21-generic
   IP4.DNS[1]:                             192.168.3.2
   Server:        127.0.0.53
   Address:   127.0.0.53#53
   ** server can't find BGOWIKI01v: SERVFAIL
   ============================================================================
   Operating System: Fedora 31 (Workstation Edition)
              Kernel: Linux 5.3.7-301.fc31.x86_64
   IP4.DNS[1]:                             192.168.3.2
   Server:        192.168.3.2
   Address:   192.168.3.2#53
   Name:  BGOWIKI01v
   Address: 192.168.3.60
   ============================================================================
   Operating System: openSUSE Leap 15.1
              Kernel: Linux 4.12.14-lp151.28.36-default
   IP4.DNS[1]:                             192.168.3.2
   Server:        192.168.3.2
   Address:   192.168.3.2#53
   Name:  BGOWIKI01v
   Address: 192.168.3.60
   ============================================================================
   Operating System: Debian GNU/Linux 10 (buster)
              Kernel: Linux 4.19.0-6-amd64
   IP4.DNS[1]:                             192.168.3.2
   Server:        192.168.3.2
   Address:   192.168.3.2#53
   Name:  BGOWIKI01v
   Address: 192.168.3.60

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: dnsutils 1:9.11.3+dfsg-1ubuntu1.11
  ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
  Uname: Linux 4.15.0-72-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Sat Feb  8 17:36:28 2020
  InstallationDate: Installed on 2019-12-22 (47 days ago)
  InstallationMedia: Ubuntu-MATE 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  SourcePackage: bind9
  UpgradeStatus: No upgrade log present (probably fresh install)

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