Perhaps related to https://bugs.launchpad.net/linuxmint/+bug/1310335

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https://bugs.launchpad.net/bugs/381896

Title:
  bad router advertisement lead to disabilitation of ipv6 privacy
  extension

Status in The Linux Kernel:
  Fix Released
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Binary package hint: linux-source

  After enabling IPV6 privacy extension (with echo 2 > 
/proc/sys/net/ipv6/conf/eth8/use_tempaddr)
  ubuntu autoconfigs, as aspected, ipv6-privacy-extension-addresses and they 
change every 60 seconds makeing outgoing connection droped every 60 seconds 
(radvd running on 6to4 prefix with  AdvPreferredLifetime 20 and 
AdvValidLifetime 30).
  After changing AdvValidLifetime to 300 in radvd (on the router) ubuntu starts 
getting assigned more and more addresses up to about 15.
  Changing AdvValidLifetime back to 30 lead ubuntu to deconfigure ALL 
ipv6-privacy-extension-addresses addresses leaving the interface with only the 
stateless address but interface is still configured to use privacy extension 
but it's no longer used. So privacy is no longer ensured without any user 
command but just some crafted ra packets.

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