Public bug reported: This seems related to LP: #1717995 but that is marked fixed.
I used my laptop at work, where I have a docking station with USB ethernet included (interface enx0050b6cf4d4a). The dhcp on the wired ethernet includes my work domain, purestorage.com. I undocked, suspended, and came home, where I have no USB ethernet (just wifi wlp4s0), and dhcp on wifi doesn't mention purestorage.com. However, I still have leftover state that stops purestorage.com names from resolving: $ systemd-resolve webvpn.purestorage.com webvpn.purestorage.com: resolve call failed: No appropriate name servers or networks for name found $ 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 lan purestorage.com dev.purestorage.com $ systemd-resolve --status Global DNS Domain: lan purestorage.com dev.purestorage.com DNSSEC NTA: 10.in-addr.arpa 16.172.in-addr.arpa 168.192.in-addr.arpa 17.172.in-addr.arpa 18.172.in-addr.arpa 19.172.in-addr.arpa 20.172.in-addr.arpa 21.172.in-addr.arpa 22.172.in-addr.arpa 23.172.in-addr.arpa 24.172.in-addr.arpa 25.172.in-addr.arpa 26.172.in-addr.arpa 27.172.in-addr.arpa 28.172.in-addr.arpa 29.172.in-addr.arpa 30.172.in-addr.arpa 31.172.in-addr.arpa corp d.f.ip6.arpa home internal intranet lan local private test Link 3 (wlp4s0) Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6 LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 10.1.0.1 fda0:5173:b519::1 DNS Domain: lan Link 2 (enp0s31f6) Current Scopes: none LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no It seems there are still issues around network interfaces being removed but leaving behind their DNS config. ProblemType: Bug DistroRelease: Ubuntu 17.10 Package: systemd 234-2ubuntu12 ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4 Uname: Linux 4.13.0-16-generic x86_64 ApportVersion: 2.20.7-0ubuntu3 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed Oct 25 17:48:47 2017 InstallationDate: Installed on 2016-09-01 (419 days ago) InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160901) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 138a:0090 Validity Sensors, Inc. Bus 001 Device 003: ID 13d3:5248 IMC Networks Bus 001 Device 005: ID 056a:5087 Wacom Co., Ltd Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub 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-4.13.0-16-generic root=UUID=30d5ada5-835d-4cf7-96cf-3329c0316107 ro quiet splash vt.handoff=7 SourcePackage: systemd UpgradeStatus: Upgraded to artful on 2017-07-26 (91 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 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1727566 Title: extra left-behind domains break domain name rsolution To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1727566/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs