[Bug 1609546] Re: Slow DNS lookup through Netgear DG834G V4 router

[Pauli Virtanen]

I'm seeing a similar issue on current Ubuntu Yakkety with Android phone
AP via WPA2-personal:

$ systemd-resolve www.guugle.com
www.guugle.com: 208.73.210.200
                208.73.210.214
                208.73.211.178
                208.73.210.217
-- Information acquired via protocol DNS in 13.6889s.
-- Data is authenticated: no

`host www.guugle.com` and nslookup on the other hand return immediately
during this time. Disabling DNSSEC and restarting systemd-resolved using
the instructions above has no effect (the above trace is after
disabling).

syslog contains the lines:

Oct 31 20:25:41 xxxxx systemd-resolved[5309]: Using degraded feature set
(UDP+EDNS0+DO) for DNS server 127.0.0.1.

resolv.conf contains only `nameserver 127.0.0.1`. The problem disappears
if I add also the line `nameserver 192.168.43.1` (that's the upstream
DNS) --- however, the following line appears in the logs:

Oct 31 20:34:05 xxxxx systemd-resolved[5309]: Using degraded feature set
(UDP) for DNS server 192.168.43.1.

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https://bugs.launchpad.net/bugs/1609546

Title:
  Slow DNS lookup through Netgear DG834G V4 router

Status in systemd package in Ubuntu:
  Triaged

Bug description:
  On up to date Yakkety if I specify my Netgear router as the DNS server (via Network Manager) then DNS lookup takes about 30 seconds. I see the delay when I run, for example,
  systemd-resolve www.google.com
  or
  wget www.google.com

  I do not see the same delay if I run
  nslookup www.google.com

  A clue may be that in syslog I see
  Aug  3 21:20:56 dibbler systemd-resolved[2362]: Using degraded feature set (UDP+EDNS0+DO) for DNS server 127.0.1.1.
  Aug  3 21:21:16 dibbler systemd-resolved[2362]: Using degraded feature set (UDP+EDNS0) for DNS server 127.0.1.1.
  Aug  3 21:21:32 dibbler systemd-resolved[2362]: Using degraded feature set (UDP) for DNS server 127.0.1.1.

  I do not see the issue if I specify an external DNS server.
  I do not see the issue on 16.04, nor previous versions, or on other devices connected to the network. I have been using this router for years.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: systemd 231-1
  ProcVersionSignature: Ubuntu 4.4.0-33.52-generic 4.4.15
  Uname: Linux 4.4.0-33-generic x86_64
  ApportVersion: 2.20.3-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Aug  3 21:24:07 2016
  InstallationDate: Installed on 2016-08-02 (1 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160802)
  MachineType: Hewlett-Packard Presario CQ57 Notebook PC
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-33-generic root=UUID=aaca48e9-0f14-4b6b-ad60-fe93989c14b8 ro quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/17/2011
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: F.47
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: 3577
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: 24.49
  dmi.chassis.asset.tag: Chassis Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnHewlett-Packard:bvrF.47:bd12/17/2011:svnHewlett-Packard:pnPresarioCQ57NotebookPC:pvr068E120000204910000620100:rvnHewlett-Packard:rn3577:rvr24.49:cvnHewlett-Packard:ct10:cvrChassisVersion:
  dmi.product.name: Presario CQ57 Notebook PC
  dmi.product.version: 068E120000204910000620100
  dmi.sys.vendor: Hewlett-Packard

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