I have IPv6 addresses from sixxs.net but if I ping a host that has both IPv4 and IPv6 addresses (i.e. www.google.com or www.facebook.com) I get the IPv4 address on windows 10 but on all the windows 7 and windows 8.1 machines in the same network get the IPv6 address. I have to use -6 to force it to ping the IPv6.
I have tried the shortcuts mentioned here https://support.microsoft.com/en-us/kb/929852 to prefer IPv6 over IPv4 but it does not fix the issue. When I go to web sites that are IPv4 and IPv6 I always get the IPv4 page.
test-ipv6.com is telling me that my browser has a real working IPv6 address but is avoiding using it. http://test-ipv6.com/faq_avoids_ipv6.html
h:\>ping www.facebook.com
Pinging star.c10r.facebook.com [31.13.66.1] with 32 bytes of data:
Reply from 31.13.66.1: bytes=32 time=8ms TTL=87
h:\>ping -6 www.facebook.com
Pinging star.c10r.facebook.com [2a03:2880:f013:1:face:b00c:0:1] with 32 bytes of
data:
Reply from 2a03:2880:f013:1:face:b00c:0:1: time=145ms
netsh interface ipv6 show prefixpolicies
Querying active state...
Precedence Label Prefix
---------- ----- --------------------------------
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
UPDATE
Thought there was an issue with my router. When I upgraded from Shibby Tomato v131 to v132 it seemed to fix the issue but now it's back again. It still works with Windows 7 and 8.1 but not Windows 10. I use fixed wireless so there is some latency in my internet connection already. When I use the IPv6 tunnel it sometimes adds significant latency (59-100ms). I think there is a feature of windows 10 that will favor IPv4 if IPv6 is significantly slower but I don't know what the limits are.
