Re: Which takes priority, ipv4, or ipv6?
On 2023-03-27 12:48:13 +0100, Richmond wrote:
> I have configured an ipv6 tunnel. If I visit this site:
>
> http://ip6.me/
>
> The "normal" test shows my ipv4 address, and the:
>
> http://ip6only.me/
>
> shows the ipv6 address.
>
> However if I switch my DNS from opendns to the one provided by my ISP
> and then run the "normal" test it shows the ipv6.
>
> The note says:
>
> (preference depends on your OS/client)
>
> So how is the preference determined? It seems to be determined by the
> DNS, but why or how do I tell for example with host -v?
It appears to be random (based on past tests).
But one can set the preference via "/etc/gai.conf". In particular:
# For sites which prefer IPv4 connections change the last line to
#
#precedence ::ffff:0:0/96 100
I had to uncomment this line in the past when I had IPv6 issues.
--
Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)
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