Is IPv4 Pale Moon's default/preferred protocol?

back2themoon · Post by **back2themoon** » 2025-06-20, 10:23

This test website seems to indicate that Pale Moon always prefers IPv4 over IPv6, when both protocols are advertised by websites.

https://ipv6-test.com/
(browser section on the right)

I don't know how reliable these tests are so I'd rather ask. If this is correct, is there a way to reverse it and make IPv6 the preferred one? Router is set to IPv6 (preferred/native) and ISP fully supports it.

Thanks

Pentium4User · Post by **Pentium4User** » 2025-06-20, 10:39

For me it gives IPv6 default.

How is the latency?
Is network.http.fast-fallback-to-IPv4 set?

back2themoon · Post by **back2themoon** » 2025-06-20, 10:51

Haven't touched network.http.fast-fallback-to-IPv4. It's set to default/true.

This test doesn't seem very reliable. I get different results on each attempt on the other sections. The Browser section was always Default: IPv4 but now I got IPv6 too a few times. Fallback: to IPv4 in < 1 second (also got 8 seconds)

Currently, it's also reporting no IPv6 connectivity so I think I'll leave it at that. Thanks for testing, Pentium4User.

suzyne · Post by **suzyne** » 2025-06-20, 10:56

For me, the results vary between the 32 and 64 bit versions of Pale Moon. The first pic is 32-bit and the second is 64-bit.

Clipboard_06-20-2025_03.png

Clipboard_06-20-2025_04.png

Post by **Moonchild** » 2025-06-20, 11:25

Pale Moon prefers IPv6 if both are available and IPv6 has fast response times (which is often not the case because of the complicated mess that is IPv6 ICMP; also often misconfigured in routers or at ISPs). On Dual-stack it will try IPv6 first, but is rather strict on the fallback policy to IPv4 (as already noted).

Post by **Moonchild** » 2025-06-20, 11:29

back2themoon wrote: ↑
2025-06-20, 10:51
This test doesn't seem very reliable. I get different results on each attempt on the other sections. The Browser section was always Default: IPv4 but now I got IPv6 too a few times. Fallback: to IPv4 in < 1 second (also got 8 seconds)

Currently, it's also reporting no IPv6 connectivity so I think I'll leave it at that. Thanks for testing, Pentium4User.

I do think the test is too fragile to be useful.
For the record, despite it showing no IPv6 in the test, your post to the forum was made from an IPv6 address so it obviously works just fine

back2themoon · Post by **back2themoon** » 2025-06-20, 13:09

Great, thanks for verifying.

Goodydino · Post by **Goodydino** » 2025-06-20, 20:15

What I got was IPv4 not supported. It also says browser default is IPv4.

Pentium4User · Post by **Pentium4User** » 2025-06-20, 20:19

It seems that this test is not reliable.

Post by **Moonchild** » 2025-06-20, 21:44

Pentium4User wrote: ↑
2025-06-20, 20:19
It seems that this test is not reliable.

I'd say this test is just broken, period. I checked from my connection now (my ISP doesn't support IPv6 at all) and according to the test I should have no connection at all (no IPv4 and no IPv6)! The ads on it worked fine though. I hope they enjoy the personalized ad revenue they got from my one-time visit.

Pentium4User · Post by **Pentium4User** » 2025-06-21, 04:28

Use https://test-ipv6.com/

Pale Moon forum

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