Public bug reported:
Hi,
in Ubuntu 21.10 I am facing a problem with DNS server list and search domain
list is not properly reset back to the previous values after a VPN is
disconnected. I reproduced this in Ubuntu 21.10 instance which was upgraded
from the older version of Ubuntu as well as in Live USB Ubuntu 21.10 so it is
not an "upgrade issue".
I use this resolv.conf symlink:
/etc/resolv.conf -> ../run/systemd/resolve/resolv.conf
Actual behavior:
VPN connect will add VPN's DNS servers and search domains into
/etc/resolv.conf. When VPN is disconnected there are some of the VPN's DNS
server and search domain entries left there, so it is not reset back properly.
Desired behavior:
VPN connect will add VPN's DNS servers and search domains into
/etc/resolv.conf. When VPN is disconnected DNS servers and search domain list
is restored to exactly the same state as was prior to the VPN connection.
Steps for reproducing:
1. Before VPN is connected this is the DNS server and search domain list in
/etc/resolv.conf:
nameserver 192.168.122.1
search .
2. Once the VPN is connected, we see there were VPN's DNS server and
serach domain list entries added:
nameserver 2xx.xx.xx.x0
nameserver 2xx.xx.xx.x1
nameserver 192.168.122.1
search domain1.local domain2.internal domain3.internal
3. After VPN disconnection, we see the DNS server and search domain list
in /etc/resolv.conf is not restored to the state at point (1.) and some
entries from VPN is being kept there:
nameserver 2xx.xx.xx.x1
nameserver 192.168.122.1
search domain2.internal domain3.internal
ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: systemd 248.3-1ubuntu8
ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
Uname: Linux 5.13.0-19-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.465
CurrentDesktop: ubuntu:GNOME
Date: Wed May 25 06:06:05 2022
LiveMediaBuild: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 0627:0001 Adomax Technology Co., Ltd QEMU USB Tablet
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Lsusb-t:
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/15p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/15p, 480M
|__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 480M
MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/username.seed
maybe-ubiquity quiet splash ---
SourcePackage: systemd
SystemdDelta:
[EXTENDED] /usr/lib/systemd/system/rc-local.service →
/usr/lib/systemd/system/rc-local.service.d/debian.conf
[EXTENDED] /usr/lib/systemd/system/systemd-localed.service →
/usr/lib/systemd/system/systemd-localed.service.d/locale-gen.conf
[EXTENDED] /usr/lib/systemd/system/user@.service →
/usr/lib/systemd/system/user@.service.d/timeout.conf
3 overridden configuration files found.
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/01/2014
dmi.bios.release: 0.0
dmi.bios.vendor: SeaBIOS
dmi.bios.version: 1.14.0-2
dmi.chassis.type: 1
dmi.chassis.vendor: QEMU
dmi.chassis.version: pc-q35-6.0
dmi.modalias:
dmi:bvnSeaBIOS:bvr1.14.0-2:bd04/01/2014:br0.0:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-6.0:sku:cvnQEMU:ct1:cvrpc-q35-6.0:
dmi.product.name: Standard PC (Q35 + ICH9, 2009)
dmi.product.version: pc-q35-6.0
dmi.sys.vendor: QEMU
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug impish
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https://bugs.launchpad.net/bugs/1975667
Title:
systemd-resolved does not reset DNS server and search domain list
properly after VPN disconnect
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