Public bug reported:
Some domains are not resolved with default systemd-resolved set up on
Ubuntu 16.10. This set up is querying the DNS server given by DHCP, and
is my ISP's router.
Now, checking with `dig` directly against 192.168.1.1 (the router), dig
complains that "Warning: Message parser reports malformed message
packet.". And indeed, for the domains that do not resolve, this warning
is always given by dig, when I query the router.
It would appear that the router or its upstream is somehow breaking the
DNS packets/responses and I'll have to figure that one out separately.
The bug here is that systemd-resolved is failing on those while every
other resolver seems to be working fine with those (supposedly
malformed) replies. All other devices in the network, phones, windows,
ubuntu 16.04, etc... are resolving with those just fine.
Most notably, I can't resolve "buy.ubuntu.com". I've captured the
packet/reply I get from my router, it's attached.
ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: systemd 231-9ubuntu1
ProcVersionSignature: Ubuntu 4.8.0-30.32-generic 4.8.6
Uname: Linux 4.8.0-30-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl nvidia_uvm nvidia_drm
nvidia_modeset nvidia
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Dec 7 11:17:43 2016
InstallationDate: Installed on 2016-11-28 (8 days ago)
InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2)
MachineType: ASUS All Series
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-30-generic
root=UUID=eb750983-a34c-4b58-b5f0-a0cfa1130d1b ro
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/04/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0504
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H81M-R
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr0504:bd06/04/2015:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH81M-R:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: All Series
dmi.product.version: System Version
dmi.sys.vendor: ASUS
modified.conffile..etc.systemd.resolved.conf: [modified]
mtime.conffile..etc.systemd.resolved.conf: 2016-12-07T10:46:19.412121
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug yakkety
** Attachment added: "capture of "tcpdump -w ... port 53""
https://bugs.launchpad.net/bugs/1648037/+attachment/4788515/+files/malformed-dns-reply-tcpdump.dump
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https://bugs.launchpad.net/bugs/1648037
Title:
Ubuntu 16.10: systemd-resolved does not resolve some domains
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