x) Saturday Feb 17, 2018, 18:35. Michiel van der Vlist ÄÄ Alex Shuman.

 AS>>>> No, it's the default "prefer IPv4 over IPv6" in your system or
 AS>>>> browser settings.
 MvdV>>> Odd. Because this only happens when I use the RELAY6 method
 MvdV>>> when locally accessing my website. When I used the netsh
 MvdV>>> method, I always connected via IPv6. And wneh connected other
 MvdV>>> websites aroud the world, IPv6 is the preferred method.
 AS>> Then it's something with RELAY6 altering IPv6 default route priority.
 MvdV>>> Hmmm...
 MvdV> It loooks like it is something peculiar to Firefox. Apparently
 MvdV> Firefox remebers if a site ismore easley reacheable via IPv4 than
 MvdV> via IPv6. It will eventually adjust when a site goes from IPv4 only
 MvdV> to dual stack, but it takes a while.

Well, if the site is not reachable via IPv6, FF indeed does a "quick fallback" 
to IPv4 and caches it.

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