x) Tuesday Jan 23, 2018, 13:48. Michiel van der Vlist ÄÄ Alex Shuman.

 AS>> No, it's the default "prefer IPv4 over IPv6" in your system or browser
 AS>> settings.
 MvdV> Odd. Because this only happens when I use the RELAY6 method when locally
 MvdV> accessing my website. When I used the netsh method, I always connected
 MvdV> via IPv6. And wneh connected other websites aroud the world, IPv6 is the
 MvdV> preferred method.

Then it's something with RELAY6 altering IPv6 default route priority.

 MvdV> Hmmm...

Well, you can try this as cmd file (it's from that site, labeled as for WinXP)

echo Setting IPv6 loopback
netsh int ipv6 set prefixpolicy ::1/128 50 0 store=persistent
echo Setting Native IPv6
netsh int ipv6 set prefixpolicy ::/0 40 1 store=persistent
echo Setting IPv4
netsh int ipv6 set prefixpolicy ::ffff:0:0/96 35 4 store=persistent
echo Setting 6to4
netsh int ipv6 set prefixpolicy 2002::/16 30 2 store=persistent
echo Setting Teredo
netsh int ipv6 set prefixpolicy 2001::/32 5 5 store=persistent
echo Setting ULAs
netsh int ipv6 set prefixpolicy fc00::/7 3 13 store=persistent
echo Setting v4compat
netsh int ipv6 set prefixpolicy ::/96 1 3 store=persistent
echo Setting IPv6 site-local
netsh int ipv6 set prefixpolicy fec0::/10 1 11 store=persistent
echo Setting 6bone
netsh int ipv6 set prefixpolicy 3ffe::/16 1 12 store=persistent
rem Show results
netsh int ipv6 show prefixpolicy
pause

...or you can experiment with such settings by yourself (highest priority value 
is used as most preferred)

 AS>>>> ipv6.dynamic.ziggo.nl [2001:1c02:1100:d700:f1d0:2:280:5555]
 AS>>>> but your ISP does not seem to assign proper reverse DNS for
 AS>>>> customers.
 MvdV>>> Indeed, that is a bit of a joke. Every IPv6 addres
 MvdV>>> (2001:1c02::/32) of my provider backresolves to
 MvdV>>> ipv6.dynamic.ziggo.nl.
 AS>> Is it dynamic or static?
 MvdV> Dynamic.

So it is set automatically by ISP and changes every time you reconnect? Then 
how did you set it to f1d0-style?

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