[Bug 1574483] Re: assigns MAC-based names for devices with locally administered MAC address
Launchpad Bug Tracker
1574483 at bugs.launchpad.net
Thu May 12 01:23:41 UTC 2016
This bug was fixed in the package systemd - 229-4ubuntu5
systemd (229-4ubuntu5) xenial-proposed; urgency=medium
* debian/udev.postinst: Don't fail if /var/log/udev is a directory.
* 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)
* debian/extra/init-functions.d/40-systemd: Invoke status command with
--no-pager, to avoid blocking scripts that call an init.d script with
"status" with an unexpected pager process. (Closes: #765175, LP: #1576409)
* Add debian/extra/rules/70-debian-uaccess.rules: Make FIDO U2F dongles
accessible to the user session. This avoids having to install libu2f-host0
(which isn't discoverable at all) to make those devices work.
* On shutdown, unmount /tmp before disabling swap. (Closes: #788303)
-- Martin Pitt <martin.pitt at ubuntu.com> Mon, 02 May 2016 15:04:42
** Changed in: systemd (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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assigns MAC-based names for devices with locally administered MAC
Status in systemd package in Ubuntu:
Status in systemd source package in Xenial:
Status in systemd source package in Yakkety:
Status in systemd package in Debian:
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
The old 75-persistent-net generator had this rule:
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.
- 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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