By default on WinXP, Win2003 or WinVista, IPv6 addresses built from IPv6 prefix (stateless configuration for instance) are using the EUI-64 (cf MAC address) of your network card as a suffix. This can lead to some privacy issues, hence another IPv6 address is dynamically computed and used by default. Such an anonymous address changes (according to a computation algorithm) each time the IPv6 stack starts. This can cause some trouble under certain conditions where the server needs a unique and static IPv6 (containing the EUI-64). The solution is to deactivate the creation of those “privacy addresses”. But be carefull, this will then lead to leaking the EUI-64 and also enables people to track you (logs, google, etc). So, it’s a tradeoff.
If you want to disable temporary IPv6 addresses, try the command :
netsh interface ipv6 set privacy state=disable
or
ipv6 -p gpu UseTemporaryAddresses no
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