I cannot confirm that glibc's "dns" works like that -- it behaves the
same as resolved:
$ grep heise.de /etc/hosts
1.2.3.4 heise.de
$ grep hosts /etc/nsswitch.conf
hosts: files dns
$ getent ahosts heise.de | grep STREAM
1.2.3.4 STREAM heise.de
If I drop the heise.de entry from /etc/hosts, I get an IPv6 address
again as expected:
$ getent ahosts heise.de | grep STREAM
2a02:2e0:3fe:1001:302:: STREAM heise.de
193.99.144.80 STREAM
This is all after "sudo systemctl stop systemd-resolved", so it's not
interfering at all. Can you try the above on your system, to make sure
it behaves the same?
** Changed in: systemd (Ubuntu)
Status: Triaged => Incomplete
** Changed in: systemd (Ubuntu)
Assignee: Martin Pitt (pitti) => (unassigned)
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https://bugs.launchpad.net/bugs/1644330
Title:
systemd-resolved assumes that /etc/hosts for one address family means
it doesn't ask DNS for another
Status in systemd package in Ubuntu:
Incomplete
Bug description:
I have an ipv4 entry for a key host on my network listed in
/etc/hosts, for network recovery purposes. This host also has ipv6
connectivity; the ipv6 address is resolvable via DNS, but I do not
have it in /etc/hosts. Resolution of hostname should be independent
for each address family.
Two days ago (I don't know what changed to trigger this), I stopped
being able to resolve the ipv6 address for this host. I traced this
down to systemd-resolved, returning a lookup failure for the nss
request, because the ipv6 address is not listed in /etc/hosts.
Removing resolve from /etc/nsswitch.conf restores the correct
behavior.
Removing the ipv4 entry for the host restores the correct behavior.
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: systemd 231-9ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1
Uname: Linux 4.8.0-27-generic x86_64
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Nov 23 08:13:33 2016
InstallationDate: Installed on 2010-09-24 (2252 days ago)
InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64
(20100816.1)
MachineType: LENOVO 2306CTO
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-27-generic.efi.signed
root=/dev/mapper/hostname-root ro quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to yakkety on 2016-10-28 (25 days ago)
dmi.bios.date: 10/25/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: G2ET97WW (2.57 )
dmi.board.asset.tag: Not Available
dmi.board.name: 2306CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvrG2ET97WW(2.57):bd10/25/2013:svnLENOVO:pn2306CTO:pvrThinkPadX230:rvnLENOVO:rn2306CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 2306CTO
dmi.product.version: ThinkPad X230
dmi.sys.vendor: LENOVO
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