680466 - Firefox 9 prefers ipv4 and not ipv6

Status: RESOLVED DUPLICATE of bug 679090

(Core :: Networking: HTTP, defect)

Description

[Elodie - France]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0a1) Gecko/20110819 Firefox/9.0a1
Build ID: 20110819030749

Steps to reproduce:

I was on the Web site  http://test-ipv6.com/  which makes it possible to test its connection ipv6.

OS : Windows 7 64 bits - Connection Dual Stack IPV4-IPV6


Actual results:

In the test, the first time Firefox 9 prefers IPV4 and the second time, it prefers IPV6.


Expected results:

Firefox should prefer IPV6 in permanence and not in a random way.

Firefox 6 release does not have this problem, it always prefers IPV6.

Comment 1

[Bob Clary [:bc] (inactive)]

not security sensitive.

Comment 2

[Jo Hermans]

That's because of bug 621558 - If IPv4 doesn't respond in 250 ms, IPv4 is tried as a quick fallback. See also <http://tools.ietf.org/html/draft-wing-http-new-tech-00>

Comment 3

[Matthias Versen [:Matti]]

Jo meant "If IPv6 doesn't respond in 250 ms, IPv4 is tried as a quick fallback".
I can confirm that IPv6 works fine if the IPv6 connection is fast enough.
Is your IPv6 connection to http://test-ipv6.com/  slower as 250ms ?

Comment 4

[Elodie - France]

My connection IPV6 towards  http://test-ipv6.com/ is of 207ms.

I made the test on Firefox 8 Aurora and Firefox 7 Beta, the first time they prefer IPV4 and as of I reactualize the page, they prefer IPV6.

I carried out this test on various navigators IE 9, Opéra 11.50, Safari 5.1, Chrome 13, they prefer all IPV6 as of the first time.

This operating mode of the new versions of Firefox poses problem on Web sites which identifies you by your IPV6 static with login and password, if it detects a change of IP in course of consultation of the site, they refuse you the access.

One would need an option in Firefox for preferred IPV6 in permanence and not only by detection of the latency time.