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[Launchpad Bug Tracker <1574483@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 229-5ubuntu1

---------------
systemd (229-5ubuntu1) yakkety; urgency=medium

  * Merge with Debian unstable. Remaining Ubuntu changes:
    - Hack to support system-image read-only /etc, and modify files in
      /etc/writable/ instead.

systemd (229-5) unstable; urgency=medium

  * debian/tests/unit-config: Call "daemon-reload" to clean up generated units
    in between tests.
  * debian/tests/unit-config: Check that enable/disable commands are
    idempotent.
  * debian/tests/unit-config: Detect if system units are in /usr/, so that the
    test works on systems with merged /usr.
  * debian/tests/unit-config: Use systemd-sysv-install instead of update-rc.d
    directly, so that the test works under Fedora too.
  * debian/tests/unit-config: Check disabling of a "systemctl link"ed unit,
    and check "systemctl enable" on a unit with full path which is not in the
    standard directories.
  * Rename debian/extra/rules/73-idrac.rules to 73-special-net-names.rules, as
    it is going to get rules for other devices. Also install it into the
    initramfs.
  * debian/extra/rules/73-special-net-names.rules: Add DEVPATH number based
    naming schema for ibmveth devices. (LP: #1561096)
  * Don't set SYSTEMD_READY=0 on DM_UDEV_DISABLE_OTHER_RULES_FLAG=1 devmapper
    devices with "change" events, as this causes spurious unmounting with
    multipath devices. (LP: #1565969)
  * Fix bogus "No [Install] section" warning when enabling a unit with full
    path. (LP: #1563590)
  * debian/tests/cmdline-upstart-boot: In test_rsyslog(), check for messages
    from dbus instead of NetworkManager. NM 1.2 does not seem to log to syslog
    by default any more.
  * Bump Standards-Version to 3.9.8 (no changes necessary).
  * debian/tests/boot-smoke: Add some extra debugging if there are pending
    jobs after 10s, to figure out why lightdm is sometimes "restarting".
    (for LP #1571673)
  * debian/tests/boot-smoke: Configure dummy X.org driver (like in the
    boot-and-services test), to avoid lightdm randomly fail. (LP: #1571673)
  * Move Debian specific patches into debian/patches/debian (which translates
    to "Gbp-Pq: Topic debian" with pq). This keeps upstream vs. Debian
    patches separated without the comments in debian/patches/series (which
    always get removed by "pq export").
  * Don't ship an empty /etc/X11/xinit/xinitrc.d/ directory, this isn't
    supported in Debian. (Closes: #822198)
  * udev: Mark nbd as inactive until connected. (Closes: #812485)
  * On shutdown, unmount /tmp before disabling swap. (Closes: #788303)
  * debian/systemd-coredump.postinst: Do daemon-reload before starting
    systemd-coredump, as the unit file may have changed on upgrades.
    (Closes: #820325)
  * Set MAC based name for USB network interfaces only for universally
    administered (i. e. stable) MACs, not for locally administered (i. e.
    randomly generated) ones. Drop /lib/systemd/network/90-mac-for-usb.link
    (as link files don't currently support globs for MACAddress=) and replace
    with an udev rule in /lib/udev/rules.d/73-special-net-names.rules.
    (Closes: #812575, LP: #1574483)

 -- Martin Pitt <martin.pitt@xxxxxxxxxx>  Mon, 25 Apr 2016 13:18:04
+0200

** Changed in: systemd (Ubuntu Yakkety)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1574483

Title:
  assigns MAC-based names for devices with locally administered MAC
  address

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  In Progress
Status in systemd source package in Yakkety:
  Fix Released
Status in systemd package in Debian:
  Fix Released

Bug description:
  Originally from https://bugs.debian.org/812575: Our current
  /lib/systemd/network/90-mac-for-usb.link assigns MAC-based names to
  all USB devices. However, this is wrong and pointless for locally
  administered MAC addresses (with the second bit set to '1', see
  https://en.wikipedia.org/wiki/MAC_address#Address_details).

  The old 75-persistent-net generator had this rule:

     ENV{MATCHADDR}=="?[2367abef]:*",        ENV{MATCHADDR}=""

  which ignored these devices. We need to adjust 90-mac-for-usb.link to
  do the same, and only apply to universally administered MAC addresses
  (at least until https://lists.ubuntu.com/archives/ubuntu-
  devel/2016-April/039302.html gets concluded).

  We should simply fall through the default policy of assigning location
  based names. The kernel assigned ones have no meaning whatsoever, so
  this at least provides name stability for use cases where you can rely
  on plugging the device into the same port.

  SRU INFORMATION:
  ================
  Fix: https://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?id=ec7e332

  Test case:
   - Plug in an Android phone and enable USB tethering, or a different USB device which uses locally administered MAC addresses, i. e. they change after every reboot of the device. The first byte of the MAC address must have the second bit set, i. e. the hex number matches ?[2367abef].
   - Check "ip a". With current xenial version the interface name is MAC based, like "enx12345678", and it changes after rebooting the device.
   - With this fix, the name is location based, like "enp0s1u2", and it remains stable as long as you use the same USB port.

  Regression potential: This only affects naming USB network devices. It
  should be tested that devices with universally administered MACs (i.
  e. stable, second bit is zero) keep MAC based names to avoid changing
  existing stable names. For devices with locally administered MACs (i.
  e. random ones) the name currently changes all the time anyway, so any
  /etc/network/interfaces or firewall script that refers to them is
  already broken and there cannot be further regressions there. Also,
  the updated policy is only applied after a computer reboot or
  replugging the device, the name does not change while the device is
  already plugged in.

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