this post was submitted on 28 Dec 2023
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Firefox not using IPv6 by default (discuss.tchncs.de)
submitted 10 months ago* (last edited 10 months ago) by [email protected] to c/[email protected]
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Websites like ipv6-test.com and test-ipv6.com say that my browser is using IPv4 by default.

This happens on Firefox and LibreWolf. I have tried creating a new profile without add-ons as well. Ungoogled Chromium uses IPv6 by default. If I go to ifconfig.io using Firefox, IPv4 is displayed. But if I use Ungoogled Chromium, IPv6 is displayed.

Is there a way to force IPv6?

I am not bothered by this, but using tools like ping6 and traceroute6 assures me that IPv6 routing is faster for, at least, one of my ISPs.

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[–] [email protected] 9 points 10 months ago* (last edited 10 months ago) (1 children)

First check if you have ipv6 disabled in Firefox. I think there was a DNS issue on some lemmy instance a while ago where people were turning ipv6 off to work around that (was later fixed) or maybe I am misremembering where that was

Go to about:config then make sure that network.dns.disableIPv6 is false.

[–] [email protected] 3 points 10 months ago (1 children)

It is false, I have checked it.

[–] [email protected] 3 points 10 months ago

Hmm, maybe this could be a DNS issue. Are you using DNS over HTTPS on Firefox (check on about:preferences#privacy? If so, what do you have the DNS provider set as?

Also what happens if you go to a website that is ipv6 only such as https://ip6only.me/? Does it fail to connect or does it then actually use ipv6?

[–] [email protected] 5 points 10 months ago (1 children)

How much faster?

[–] [email protected] 5 points 10 months ago

Pinging my server in Frankfurt, DE, from my home in India, the ping speed using IPv4 is ~300ms, and using IPv6 is ~270ms.

[–] [email protected] 5 points 10 months ago

I cannot reproduce that issue. Either site says IPv6 is working fine.

FF 121 on macOS.