Re: Which takes priority, ipv4, or ipv6?
On Tue, 28 Mar 2023, Andy Smith wrote:
Thirdly, if no special handling is in use then your operating
system chooses which address to use. There's an RFC for that, and
all of that is configured in /etc/gai.conf on Debian. The default
behaviour is to try IPv6 first.
The default differs from RFC 3484
See the comment in gai.conf
If you are using ULA then ipv4 will be chosen in preference.
I have configured an ipv6 tunnel.
The op doesn't say how this is configured but ULAs often appear around
tunnels.
uncomment the first five lines here to do what RFC3484 suggests.
#label ::1/128 0
#label ::/0 1
#label 2002::/16 2
#label ::/96 3
#label ::ffff:0:0/96 4
#label fec0::/10 5
#label fc00::/7 6
#label 2001:0::/32 7
Tim
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