Public bug reported:
In our network we have a DNS server that resolves some names to local
addresses, while the same names are resolved to our public IP when
public DNSs are used. For instance (using fictitious names and IPs),
xyz.mydomain.com resolves to the public IP 65.254.242.180 when using an
external DNS server, but resolves to 192.168.0.14 when using our
internal DNS server (which all our computers are told to use via DHCP).
This used to work fine until a somewhat recent update in Ubuntu 17.10.
Now, xyz.domain.com almost always resolves to the public IP instead of
the internal IP. Interestingly, restarting the systemd-resolved service
fixes the problem for a while (from a few seconds to a few minutes).
Right after restarting the service, the dig command reports the expected
internal IP, but after a while it gets back to reporting the public IP.
Forcing the dig command to query our DNS server instead of the local
resolver returns the correct IP.
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: systemd 234-2ubuntu9
ProcVersionSignature: Ubuntu 4.12.0-13.14-generic 4.12.10
Uname: Linux 4.12.0-13-generic x86_64
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Sep 13 13:34:50 2017
InstallationDate: Installed on 2015-01-23 (963 days ago)
InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64
(20140722.2)
MachineType: LENOVO 20266
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.12.0-13-generic.efi.signed
root=UUID=eecad38d-4fff-462c-92bc-357fa12e5515 ro quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to artful on 2017-06-15 (90 days ago)
dmi.bios.date: 03/30/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 76CN43WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Yoga2
dmi.board.vendor: LENOVO
dmi.board.version: 31900058STD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Yoga 2 Pro
dmi.modalias:
dmi:bvnLENOVO:bvr76CN43WW:bd03/30/2015:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
dmi.product.family: IDEAPAD
dmi.product.name: 20266
dmi.product.version: Lenovo Yoga 2 Pro
dmi.sys.vendor: LENOVO
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug artful wayland-session
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https://bugs.launchpad.net/bugs/1716976
Title:
DNS resolver silently switches to an unknown DNS server
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