Public bug reported:
I installed rdnssd on a laptop which I mostly use in two places. At one
place, I have dual stack network, with dual stack DNS servers, in the
other place, the network is IPv4 only.
When I go to the first place, rdnssd correctly receives the advertised
DNS (IPv6) servers and places them in /etc/resolv.conf. Everything
works.
However, when I go to the second network, the IPv6 addresses for the DNS
servers remain in /etc/resolv.conf, and that means networking mostly
doesn't work, since most DNS queries are sent to the two IPv6 addresses
which are now "Network unreachable".
When switching to a IPv4 only network (or an IPv6 network which doesn't
advertise IPv6 addresses for it's DNS via RDNSS), the IPv6 addresses of
the DNS should be removed from /etc/resolv.conf
lsb_release -rd
Description: Ubuntu 14.04.4 LTS
Release: 14.04
apt-cache policy rdnssd
rdnssd:
Installed: 1.0.1-1ubuntu1
Candidate: 1.0.1-1ubuntu1
Version table:
*** 1.0.1-1ubuntu1 0
500 http://ftp.arnes.si/pub/mirrors/ubuntu/ trusty/universe amd64
Packages
100 /var/lib/dpkg/status
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: rdnssd 1.0.1-1ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-58.64~14.04.1-generic 3.19.8-ckt16
Uname: Linux 3.19.0-58-generic x86_64
NonfreeKernelModules: nvidia wl
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Mon May 9 09:16:48 2016
InstallationDate: Installed on 2015-11-28 (162 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
SourcePackage: ndisc6
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: ndisc6 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1579640
Title:
IPv6 nameservers not removed from /etc/resolv.conf when switching to a
IPv4 network
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