Hi all, In order to protect end point's privacy, microsoft's operating systems use privacy address in their ipv6 implementation. There are two parameters about privacy address, maxvalidlifetime and maxpreferredlifetime. The default values about these two parameters are 7d and 1d. This means when the operating system generates a privacy address, it can be used as preferred address for 1 day. When the time is expired, this privacy address will not be used as source address, but other end points can sent ipv6 package to this address. And the operating system will generate another privacy address. After 7 days (the machine does not shut down in this time), the primary privacy address will disappear. We can use netsh to modify these two parameters. But the minimum value of maxpreferredlifetime is 11m. In window xp, everything is operating correctly as it is designed. But in windows 7, when I modify maxpreferredlifetime to be 11m. After 11 minutes, another privacy address is not generated, and the primary privacy address's maxpreferredlifetime changes to be 7d as equal as maxvalidlifetime automatically. I don't know why? Is it a bug about windows 7?

Hi, I suggest updating the network adapter driver from the manufacture. In addition, please let me know which command you used to set the value. Regards, Niki Please remember to click "Mark as Answer" on the post that helps you, and to click "Unmark as Answer" if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

netsh int ipv6 set privacy maxpreferredlifetime=12m store=persistent show privacy