[Bug 1683066] Re: Broken DNS when using Three UK mobile internet (17.04 zesty)

[DieterDrewanz]

>From here I picked idea of testing different wlan connections (router
and smart phone as hot spot) and looking for differences.  Although
there was another reason for this bug and this bug is not similar but
some similar error messages.

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Title:
  Broken DNS when using Three UK mobile internet (17.04 zesty)

Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  When connected via 4G to Three/3 (UK), DNS lookups fail (though the
  internet is otherwise working).

  The connection receives the correct DNS servers, but as far as I can
  work out systemd-resolve is unaware of them.

  Connection info screenshot is attached.

  DNS lookups time out:

  $ nslookup www.bbc.co.uk
  ;; connection timed out; no servers could be reached

  However they work when manually specifying the DNS server:

  $ nslookup www.bbc.co.uk 217.171.132.0
  Server:		217.171.132.0
  Address:	217.171.132.0#53

  Non-authoritative answer:
  www.bbc.co.uk	canonical name = www.bbc.net.uk.
  Name:	www.bbc.net.uk
  Address: 212.58.246.54
  Name:	www.bbc.net.uk
  Address: 212.58.244.26

  Connections to IP addresses work (though redirect to a Three page at
  present):

  $ curl http://212.58.246.54 -v
  * Rebuilt URL to: http://212.58.246.54/
  *   Trying 212.58.246.54...
  * TCP_NODELAY set
  * Connected to 212.58.246.54 (212.58.246.54) port 80 (#0)
  > GET / HTTP/1.1
  > Host: 212.58.246.54
  > User-Agent: curl/7.52.1
  > Accept: */*
  >
  < HTTP/1.1 302 Moved Temporarily
  < Location: http://mbbinfo.three.co.uk/payg_mbb_data_usage2.html
  < Content-Type: text/plain; charset=UTF-8
  < Content-Length: 0
  <
  * Curl_http_done: called premature == 0
  * Connection #0 to host 212.58.246.54 left intact

  Below is the output of systemd-resolve --status:

  $ systemd-resolve --status
  Global
           DNS Servers: 8.8.8.8
                        8.8.4.4
                        2001:4860:4860::8888
                        2001:4860:4860::8844
            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 4 (wlp4s0)
        Current Scopes: none
         LLMNR setting: yes
  MulticastDNS setting: no
        DNSSEC setting: allow-downgrade
      DNSSEC supported: yes

  Link 3 (wwp0s20f0u6i12)
        Current Scopes: LLMNR/IPv4 LLMNR/IPv6
         LLMNR setting: yes
  MulticastDNS setting: no
        DNSSEC setting: allow-downgrade
      DNSSEC supported: yes

  Link 2 (enp0s31f6)
        Current Scopes: none
         LLMNR setting: yes
  MulticastDNS setting: no
        DNSSEC setting: allow-downgrade
      DNSSEC supported: yes

  Note: Everything works fine on Wi-Fi, this problem is only happening
  on 4G.

  Note 2: I removed the automatically added UdevDb.txt and
  CurrentDmesg.txt attachments as they contained serial numbers of
  devices in my computer (such as for my SSD).

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: systemd 232-21ubuntu2
  ProcVersionSignature: Ubuntu 4.10.0-19.21-generic 4.10.8
  Uname: Linux 4.10.0-19-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4
  Architecture: amd64
  CurrentDesktop: Unity:Unity7
  Date: Sat Apr 15 20:54:33 2017
  InstallationDate: Installed on 2017-04-08 (7 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Beta amd64 (20170407)
  MachineType: LENOVO 20HDCTO1WW
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-19-generic.efi.signed root=UUID=88cb6912-997a-41b4-a0f8-050239177218 ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/29/2017
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N1QET53W (1.28 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20HDCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrN1QET53W(1.28):bd03/29/2017:svnLENOVO:pn20HDCTO1WW:pvrThinkPadT470:rvnLENOVO:rn20HDCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20HDCTO1WW
  dmi.product.version: ThinkPad T470
  dmi.sys.vendor: LENOVO

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