To check

  netsh interface ipv6 show prefixpolicies

You should see the following output:


        50      0  ::1/128
        40      1  ::/0
        35      4  ::ffff:0:0/96
        30      2  2002::/16
         5      5  2001::/32
         3     13  fc00::/7
         1     11  fec0::/10
         1     12  3ffe::/16
         1      3  ::/96
The first line with a precedence of 50 is the IPv6 loopback adapter.
The second line with a precedence of 40 is the IPv6 default gateway.
The third with a precedence of 35 is all IPv4 compatible addresses. To change the precedence, type the following:

  netsh interface ipv6 set prefixpolicy ::ffff:0:0/96 46 4