IPv6: disable, enable, prefer, auto config

Disable IPv6 in Windows:

netsh interface teredo set state disabled

netsh interface ipv6 6to4 set state state=disabled undoonstop=disabled
netsh interface ipv6 isatap set state state=disabled

netsh int ipv6 isatap set state disabled
netsh int ipv6 6to4 set state disabled
netsh interface teredo set state disable

regedit
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters
DisabledComponents = DWORD 0xffffffff
https://www.ipv6.cz/Jak_vypnout_IPv6

reg query HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters /v DisabledComponents



Enable IPv6 in Windows:
Microsoft Quick Fix
http://support.microsoft.com/kb/929852



Prefer IPv6 over IPv4:
Control prefix policies
netsh int ipv6 sho prefix

Precedence  Label  Prefix
----------  -----  --------------------------------
        50      0  ::1/128
        40      1  ::/0
        30      2  2002::/16
        20      3  ::/96
        10      4  ::ffff:0:0/96
         5      5  2001::/32



Client IPv6 auto configuration:
Radvd - Linux daemon for IPv6 auto configuration of network clients
DHCPv6