I just realised that this bug also impacts NetworkManager, at least on Vivid: I set the property "ipv6.ip6-privacy" on the default wired Ethernet interface to 0 (in order to prevent a remote CIFS mount from freezing every few hours), however after a reboot, privacy extensions remained active. My assumption is that NetworkManager configured the interface correctly (without privacy extensions) early on during the boot process, only to have the procps' 10-ipv6-privacy.conf overwrite it moments later. Disabling 10-ipv6-privacy.conf solved this issue too.
** Summary changed: - 10-ipv6-privacy.conf stomps on user-configured "privext" option + 10-ipv6-privacy.conf stomps on the ifup/NetworkManager "privext"/"ipv6.ip6-privacy" settings ** Also affects: ifupdown (Ubuntu) Importance: Undecided Status: New ** Also affects: network-manager (Ubuntu) Importance: Undecided Status: New ** Summary changed: - 10-ipv6-privacy.conf stomps on the ifup/NetworkManager "privext"/"ipv6.ip6-privacy" settings + procps' 10-ipv6-privacy.conf stomps on the ifup/NetworkManager "privext"/"ipv6.ip6-privacy" settings -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1497166 Title: procps' 10-ipv6-privacy.conf stomps on the ifup/NetworkManager "privext"/"ipv6.ip6-privacy" settings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ifupdown/+bug/1497166/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs