Comment 15 for bug 590537

Tom-H4 writes for ubuntu-users mailing list
http://old.nabble.com/lo:-Disabled-Privacy-Extensions-td26630008.html

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It is a kernel config - IPV6_PRIVACY - and it is set to "y" in KK so
you would have to recompile your kernel in order to set it to "n" or
"m".

The corresponding proc entry is
/proc/sys/net/ipv6/conf/lo/use_tempaddr

and when I "sysctl" or "cat" mine, it returns "-1". (And it is 0 for wlan0.)

You could sysctl yours to "-1" if it isn't and it might stop the
"Privacy" messages. (And if it isn't set to "-1" for KK server
edition, you might want to file a bug report.)

The values that use_tempaddr can take are

<= 0 disable Privacy Extensions

== 1 enable Privacy Extensions, but prefer public addresses over
temporary addresses

> 1 enable Privacy Extensions and prefer temporary addresses over public addresses

Default 0 (for most devices)

Default -1 (for point-to-point devices and loopback devices)