[Bug 1731522] Re: systemd-resolved sends SERVFAIL to host/nslookup for pod51041.outlook.com

Shuhao shuhao at shuhaowu.com
Tue Nov 28 05:30:07 UTC 2017 

The bug report here is likely inaccurate. I don't exactly know where the
problem is.

I did some tcpdumps for port 53 traffic. I see that if I did a ping, it
requests for the A records of the domain name and indeed the IP
addresses are getting returned. However, weirdly, ping then requests for
the A records of pod51041.outlook.com.lan. .lan is the search domain on
my network as specified with /etc/resolv.conf automatically.

Furthermore, if I disable ipv6, thunderbird and firefox can access the
domain, but ping still cannot.

So I don't think this bug report should be filed against systemd, but I
don't really know where the problem lies.

** Description changed:

  Trying to resolve pod51041.outlook.com's domain name seems to fail for
  applications:
  
- $ nslookup                                                               
- > host pod51041.outlook.com
- Server:		127.0.0.53
- Address:	127.0.0.53#53
- 
- ** server can't find host: SERVFAIL
- 
- 
- $ ping pod51041.outlook.com                                              
+ $ ping pod51041.outlook.com
  ping: pod51041.outlook.com: Temporary failure in name resolution
- 
  
  (Also can't access via thunderbird).
  
  However, it seems to work directly via systemd-resolve:
  
  $ systemd-resolve pod51041.outlook.com
  pod51041.outlook.com: 40.97.160.2
-                       40.97.126.50
-                       132.245.38.194
-                       40.97.147.194
-                       132.245.41.34
-                       40.97.176.2
-                       40.97.150.242
-                       40.97.85.114
-                       40.97.120.50
-                       40.97.85.2
-                       40.97.176.34
-                       40.97.138.242
-                       40.97.166.18
-                       40.97.120.162
-                       40.97.119.82
-                       40.97.176.18
-                       40.97.85.98
-                       40.97.134.34
-                       40.97.84.18
+                       40.97.126.50
+                       132.245.38.194
+                       40.97.147.194
+                       132.245.41.34
+                       40.97.176.2
+                       40.97.150.242
+                       40.97.85.114
+                       40.97.120.50
+                       40.97.85.2
+                       40.97.176.34
+                       40.97.138.242
+                       40.97.166.18
+                       40.97.120.162
+                       40.97.119.82
+                       40.97.176.18
+                       40.97.85.98
+                       40.97.134.34
+                       40.97.84.18
  
  -- Information acquired via protocol DNS in 2.5ms.
  -- Data is authenticated: no
+ 
+ It also works with dig and nslookup.
  
  Not quite sure why this is the case, I've spotted this issue upstream
  that looks similar: https://github.com/systemd/systemd/issues/6520.
  However, I'm not familiar enough with DNS to tell if it is the same
  issue.
  
  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
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Fri Nov 10 13:10:02 2017
  InstallationDate: Installed on 2017-11-10 (0 days ago)
  InstallationMedia: Ubuntu-MATE 17.10 "Artful Aardvark" - Release amd64 (20171018)
  MachineType: LENOVO 2324BB9
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-generic.efi.signed root=UUID=8ab6bf88-72bd-4308-941e-3b36d4d7811b ro rootflags=subvol=@ quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/03/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ETA6WW (2.66 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2324BB9
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ETA6WW(2.66):bd03/03/2016:svnLENOVO:pn2324BB9:pvrThinkPadX230:rvnLENOVO:rn2324BB9:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.family: ThinkPad X230
  dmi.product.name: 2324BB9
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

** Summary changed:

- systemd-resolved sends SERVFAIL to host/nslookup for pod51041.outlook.com
+ Cannot ping pod51041.outlook.com but can dig.

-- 
You received this bug notification because you are a member of Ubuntu
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https://bugs.launchpad.net/bugs/1731522

Title:
  Cannot ping pod51041.outlook.com but can dig.

Status in systemd package in Ubuntu:
  New

Bug description:
  Trying to resolve pod51041.outlook.com's domain name seems to fail for
  applications:

  $ ping pod51041.outlook.com
  ping: pod51041.outlook.com: Temporary failure in name resolution

  (Also can't access via thunderbird).

  However, it seems to work directly via systemd-resolve:

  $ systemd-resolve pod51041.outlook.com
  pod51041.outlook.com: 40.97.160.2
                        40.97.126.50
                        132.245.38.194
                        40.97.147.194
                        132.245.41.34
                        40.97.176.2
                        40.97.150.242
                        40.97.85.114
                        40.97.120.50
                        40.97.85.2
                        40.97.176.34
                        40.97.138.242
                        40.97.166.18
                        40.97.120.162
                        40.97.119.82
                        40.97.176.18
                        40.97.85.98
                        40.97.134.34
                        40.97.84.18

  -- Information acquired via protocol DNS in 2.5ms.
  -- Data is authenticated: no

  It also works with dig and nslookup.

  Not quite sure why this is the case, I've spotted this issue upstream
  that looks similar: https://github.com/systemd/systemd/issues/6520.
  However, I'm not familiar enough with DNS to tell if it is the same
  issue.

  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
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.20.7-0ubuntu3
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Fri Nov 10 13:10:02 2017
  InstallationDate: Installed on 2017-11-10 (0 days ago)
  InstallationMedia: Ubuntu-MATE 17.10 "Artful Aardvark" - Release amd64 (20171018)
  MachineType: LENOVO 2324BB9
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-16-generic.efi.signed root=UUID=8ab6bf88-72bd-4308-941e-3b36d4d7811b ro rootflags=subvol=@ quiet splash vt.handoff=7
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/03/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ETA6WW (2.66 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2324BB9
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG2ETA6WW(2.66):bd03/03/2016:svnLENOVO:pn2324BB9:pvrThinkPadX230:rvnLENOVO:rn2324BB9:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.family: ThinkPad X230
  dmi.product.name: 2324BB9
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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