Public bug reported:

I access the following URL, which is done via IPv6 and returns my IPv6
address:

https://craig.mcqueen.id.au/ip.php

Then I access:

https://ipv4.craig.mcqueen.id.au/ip.php

That sub-domain has only a DNS A record, which should force it to be an
IPv4 access. But, somehow Firefox manages to access it via IPv6 and
return my IPv6 address again.

I think Firefox should access the second URL via IPv4.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: firefox 51.0.1+build2-0ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
Uname: Linux 4.4.0-57-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  craig      1936 F.... pulseaudio
BuildID: 20170125172221
Channel: Unavailable
CurrentDesktop: Unity
Date: Sun Feb  5 09:42:30 2017
Extensions: extensions.sqlite corrupt or missing
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini 
or extensions.sqlite)
InstallationDate: Installed on 2015-10-08 (485 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
IpRoute:
 default via 192.168.178.1 dev eth0  proto static  metric 100 
 192.168.178.0/24 dev eth0  proto kernel  scope link  src 192.168.178.33  
metric 100
Locales: extensions.sqlite corrupt or missing
MostRecentCrashID: bp-a5d28002-f6a2-4e09-9e15-4cc312161226
Plugins:
 Google Talk Plugin - /opt/google/talkplugin/libnpgoogletalk.so 
(google-talkplugin)
 Google Talk Plugin Video Renderer - /opt/google/talkplugin/libnpo1d.so 
(google-talkplugin)
 iTunes Application Detector - 
/usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so 
(rhythmbox-mozilla)
 Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
PrefSources:
 prefs.js
 [Profile]/extensions/[email protected]/defaults/preferences/defaultPrefs.js
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
Profiles: Profile0 (Default) - LastVersion=51.0.1/20170125172221 (In use)
RelatedPackageVersions:
 google-talkplugin 5.41.3.0-1
 rhythmbox-mozilla 3.3-1ubuntu7
RunningIncompatibleAddons: False
SourcePackage: firefox
SubmittedCrashIDs:
 bp-a5d28002-f6a2-4e09-9e15-4cc312161226
 bp-c84c5629-e2eb-4027-8054-bb86b2160724
Themes: extensions.sqlite corrupt or missing
UpgradeStatus: Upgraded to xenial on 2016-06-23 (226 days ago)
dmi.bios.date: 11/27/2008
dmi.bios.vendor: TOSHIBA
dmi.bios.version: Version 1.90
dmi.board.asset.tag: 0000000000
dmi.board.name: Portable PC
dmi.board.vendor: TOSHIBA
dmi.board.version: Version A0
dmi.chassis.asset.tag: 0000000000
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: Version 1.0
dmi.modalias: 
dmi:bvnTOSHIBA:bvrVersion1.90:bd11/27/2008:svnTOSHIBA:pnTECRAP10:pvrPTSB3A-05R001:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
dmi.product.name: TECRA P10
dmi.product.version: PTSB3A-05R001
dmi.sys.vendor: TOSHIBA

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1661891

Title:
  Access to IPv4-only subdomain via IPv6

Status in firefox package in Ubuntu:
  New

Bug description:
  I access the following URL, which is done via IPv6 and returns my IPv6
  address:

  https://craig.mcqueen.id.au/ip.php

  Then I access:

  https://ipv4.craig.mcqueen.id.au/ip.php

  That sub-domain has only a DNS A record, which should force it to be
  an IPv4 access. But, somehow Firefox manages to access it via IPv6 and
  return my IPv6 address again.

  I think Firefox should access the second URL via IPv4.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: firefox 51.0.1+build2-0ubuntu0.16.04.1
  ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35
  Uname: Linux 4.4.0-57-generic x86_64
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  craig      1936 F.... pulseaudio
  BuildID: 20170125172221
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Sun Feb  5 09:42:30 2017
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2015-10-08 (485 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IpRoute:
   default via 192.168.178.1 dev eth0  proto static  metric 100 
   192.168.178.0/24 dev eth0  proto kernel  scope link  src 192.168.178.33  
metric 100
  Locales: extensions.sqlite corrupt or missing
  MostRecentCrashID: bp-a5d28002-f6a2-4e09-9e15-4cc312161226
  Plugins:
   Google Talk Plugin - /opt/google/talkplugin/libnpgoogletalk.so 
(google-talkplugin)
   Google Talk Plugin Video Renderer - /opt/google/talkplugin/libnpo1d.so 
(google-talkplugin)
   iTunes Application Detector - 
/usr/lib/mozilla/plugins/librhythmbox-itms-detection-plugin.so 
(rhythmbox-mozilla)
   Shockwave Flash - /usr/lib/flashplugin-installer/libflashplayer.so
  PrefSources:
   prefs.js
   
[Profile]/extensions/[email protected]/defaults/preferences/defaultPrefs.js
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=51.0.1/20170125172221 (In use)
  RelatedPackageVersions:
   google-talkplugin 5.41.3.0-1
   rhythmbox-mozilla 3.3-1ubuntu7
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  SubmittedCrashIDs:
   bp-a5d28002-f6a2-4e09-9e15-4cc312161226
   bp-c84c5629-e2eb-4027-8054-bb86b2160724
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to xenial on 2016-06-23 (226 days ago)
  dmi.bios.date: 11/27/2008
  dmi.bios.vendor: TOSHIBA
  dmi.bios.version: Version 1.90
  dmi.board.asset.tag: 0000000000
  dmi.board.name: Portable PC
  dmi.board.vendor: TOSHIBA
  dmi.board.version: Version A0
  dmi.chassis.asset.tag: 0000000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: TOSHIBA
  dmi.chassis.version: Version 1.0
  dmi.modalias: 
dmi:bvnTOSHIBA:bvrVersion1.90:bd11/27/2008:svnTOSHIBA:pnTECRAP10:pvrPTSB3A-05R001:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0:
  dmi.product.name: TECRA P10
  dmi.product.version: PTSB3A-05R001
  dmi.sys.vendor: TOSHIBA

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