Public bug reported:
I use a VPN (network manager "vpnc" config) to connect to my work
network. The gateway is "webvpn.purestorage.com". When I connect, I
get "purestorage.com" added to the "search" line in my /etc/resolv.conf
(and /run/resolvconf/interface/systemd-resolved) - which makes perfect
sense, the VPN passes this info to me and then I can connect to systems
within the work network without having to use a FQDN.
The bug (which is a regression from older versions of Ubuntu) is that
when I lose my connection to the VPN (either because I disconnect
explicitly, or because the network goes down or I suspend my laptop),
the "purestorage.com" domain is not removed from those "search" lines.
And for some reason this prevents me from resolving
webvpn.purestorage.com (which prevents me from reconnecting to the VPN).
In particular, if I connect and disconnect my VPN, I get:
$ systemd-resolve webvpn.purestorage.com
webvpn.purestorage.com: resolve call failed: No appropriate name servers or
networks for name found
If I then edit /etc/resolv.conf by hand to remove all the
purestorage.com entries from the search line - in other words, change
$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.53
search home.digitalvampire.org purestorage.com dev.purestorage.com
to
$ cat /etc/resolv.conf
# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
# 127.0.0.53 is the systemd-resolved stub resolver.
# run "systemd-resolve --status" to see details about the actual nameservers.
nameserver 127.0.0.53
search home.digitalvampire.org
and change nothing else, then:
$ systemd-resolve webvpn.purestorage.com
webvpn.purestorage.com: 192.30.189.1
(vpn.purestorage.com)
-- Information acquired via protocol DNS in 25.9ms.
-- Data is authenticated: no
I'm not sure if the bug is in systemd, network manager, or some other package,
but I'm happy to try any debugging that is helpful to resolve this (no pun
intended).
ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: systemd 234-2ubuntu10
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: GNOME
Date: Mon Sep 18 11:20:17 2017
InstallationDate: Installed on 2016-09-01 (381 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160901)
MachineType: LENOVO 20FRS2FK00
ProcEnviron:
TERM=screen
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.12.0-13-generic
root=UUID=30d5ada5-835d-4cf7-96cf-3329c0316107 ro quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to artful on 2017-07-26 (53 days ago)
dmi.bios.date: 07/13/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N1FET53W (1.27 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20FRS2FK00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 31
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN1FET53W(1.27):bd07/13/2017:svnLENOVO:pn20FRS2FK00:pvrThinkPadX1Yoga1st:rvnLENOVO:rn20FRS2FK00:rvrSDK0J40697WIN:cvnLENOVO:ct31:cvrNone:
dmi.product.family: ThinkPad X1 Yoga 1st
dmi.product.name: 20FRS2FK00
dmi.product.version: ThinkPad X1 Yoga 1st
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/1717995
Title:
extra domains not removed from resolv.conf when VPN disconnects
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