[Bug 576979] [NEW] Firefox dual-IPv6/IPv4-stack favors IPv4 over IPv6 connections.

[Inox]

Public bug reported:

Binary package hint: firefox

After upgrade from karmic to lucid IPv4 enabled version of websites load
prior top IPv6 ones. I'm using miredo. ufw is set to accept IPv6
traffic. However, even if ufw is stopped the problem persists.

IPv6 connectivity is present - I can connect to IPv6 only web-sites and
SSH servers, can ping6, can get ubuntu distro via torrent from v6
tracker, can do anything, but...

...Firefox (and Opera) load IPv4 versions. In about:config (Firefox)
"network.dns.disableIPv6" is set to "false".

Test at http://test-ipv6.com shows the following result:

Test with IPv4 DNS record success (0.199s)
Test with IPv6 DNS record success (0.228s)
Test with IPv6 DNS record + IPv6 DNS server failed (0.032s)
Test with Dual Stack DNS record success (0.199s; used IPv4)
Test IPv4 without DNS success (0.197s)
Test IPv6 without DNS success (0.223s)
Test IPv6 large packet success (0.225s)

Nothing else was changed since upgrade took place.

Expected behavior is to load IPv6 sites prior to IPv4.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: firefox 3.6.4+build3+nobinonly-0ubuntu0.10.04.1
ProcVersionSignature: Ubuntu 2.6.32-22.33-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-22-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
CrashDB: ubuntu
Date: Fri May  7 15:02:30 2010
FirefoxPackages:
 firefox 3.6.4+build3+nobinonly-0ubuntu0.10.04.1
 firefox-gnome-support 3.6.4+build3+nobinonly-0ubuntu0.10.04.1
 firefox-branding 3.6.4+build3+nobinonly-0ubuntu0.10.04.1
 abroswer N/A
 abrowser-branding N/A
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
ProcEnviron:
 LANGUAGE=en
 LANG=en_US.utf8
 SHELL=/bin/bash
SourcePackage: firefox
ThirdParty: True

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


** Tags: apport-bug i386 ppa

-- 
Firefox dual-IPv6/IPv4-stack favors IPv4 over IPv6 connections.
https://bugs.launchpad.net/bugs/576979
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