[Bug 1920781] Re: Mobile phone hotspot unusable due to systemd-resolved not liking the DNS

[Dimitri John Ledkov]

@callegar

It would be nice to see the full resolvectl status.

Because depending on which things you have configured it might be
expected to have DNSSEC validation working, and the request is routed to
multiple interfaces, and none of them return results or the results fail
to validate.

Also note that strict DNSSEC is off by default.... did you turn it on in
the first place?

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Title:
  Mobile phone hotspot unusable due to systemd-resolved not liking the
  DNS

Status in systemd package in Ubuntu:
  Incomplete
Status in systemd source package in Focal:
  Incomplete
Status in systemd source package in Groovy:
  Incomplete

Bug description:
  Seen in 20.04.

  Trying to connect to the internet using the mobile phone hotspot is
  impossible due to systemd-resolved not resolving and reporting things
  like:

  resolve call failed: DNSSEC validation failed: incompatible-server

  and

  systemd-resolved[81699]: DNSSEC validation failed for question d.3.1.b.d.e.1.e.1.6.9.e.7.8.4.5.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa IN PTR: no-signature
  DNSSEC validation failed for question b.d.e.1.e.1.6.9.e.7.8.4.5.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa IN DS: no-signature

  etc etc.

  Name resolution works just fine from the mobile phone.

  Funny thing is that the issue persists if DNSSEC is disabled via
  resolvectl for the interface:

  Link 3 (wlan0)
        Current Scopes: DNS          
  DefaultRoute setting: yes          
         LLMNR setting: yes          
  MulticastDNS setting: no           
    DNSOverTLS setting: opportunistic
        DNSSEC setting: no           
      DNSSEC supported: no           
    Current DNS Server: 192.168.43.1 
           DNS Servers: 192.168.43.1

  Systemd-resolved won't accept the issue to be reported upstream saying
  that a too old version of systemd is being used.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.5
  ProcVersionSignature: Ubuntu 5.8.0-45.51~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-45-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Mon Mar 22 15:39:23 2021
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2020-02-16 (400 days ago)
  InstallationMedia: Kubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
  MachineType: SCHENKER SCHENKER_SLIM14_SSL14L19
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-45-generic root=/dev/mapper/VG_NVMe-root ro quiet splash vt.handoff=7
  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/user at .service → /usr/lib/systemd/system/user at .service.d/timeout.conf
   
   2 overridden configuration files found.
  UpgradeStatus: Upgraded to focal on 2020-05-23 (303 days ago)
  dmi.bios.date: 10/02/2019
  dmi.bios.release: 7.4
  dmi.bios.vendor: INSYDE Corp.
  dmi.bios.version: 1.07.04RTR1
  dmi.board.asset.tag: Tag 12345
  dmi.board.name: N141CU
  dmi.board.vendor: SCHENKER
  dmi.board.version: Not Applicable
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Notebook
  dmi.chassis.version: N/A
  dmi.ec.firmware.release: 7.2
  dmi.modalias: dmi:bvnINSYDECorp.:bvr1.07.04RTR1:bd10/02/2019:br7.4:efr7.2:svnSCHENKER:pnSCHENKER_SLIM14_SSL14L19:pvrNotApplicable:rvnSCHENKER:rnN141CU:rvrNotApplicable:cvnNotebook:ct10:cvrN/A:
  dmi.product.family: Not Applicable
  dmi.product.name: SCHENKER_SLIM14_SSL14L19
  dmi.product.sku: Not Applicable
  dmi.product.version: Not Applicable
  dmi.sys.vendor: SCHENKER
  modified.conffile..etc.systemd.resolved.conf: [modified]
  mtime.conffile..etc.systemd.resolved.conf: 2021-02-10T11:20:21.512139
  mtime.conffile..etc.systemd.sleep.conf: 2020-08-13T07:55:23.365733

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