Even though IPv6 is default on most systems now and has been for a number of years, it still seems to be more problematic than using IPV4. It is interesting that a new router I bought had IPV6 disabled by default and the settings buried for turning it on. That is why I prefer to have my web browser default to ipv4 first with the fallback to ipv6 within a second.
To configure this on Linux edit the /etc/gai.conf file using root priviledges, scroll down to where you see the following text and uncomment the precedence line. Save the file and reboot.
# For sites which prefer IPv4 connections change the last line to
#
precedence ::ffff:0:0/96 100
To test that its working properly go to https://ipv6-test.com/
It will show the default protocol and the fallback to ipv6 time. The score should be 14/20 typically.
Thats it, now using a more proven and reliable protocol first with the newer and less proven protocol as backup.
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