Consistent names changed yet again?

[Adam Williamson]

On Wed, 2014-08-06 at 07:41 -0400, Tom Horsley wrote:
> I've got F21 branched installed on an alternate partition on
> my system, and I noticed this nonsense. On F21 I get this:
> 
> enp5s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>         inet 10.134.30.143  netmask 255.255.255.0  broadcast 10.134.30.255
>         inet6 fe80::20b:eff:fe0f:ed  prefixlen 64  scopeid 0x20<link>
>         ether 00:0b:0e:0f:00:ed  txqueuelen 1000  (Ethernet)
>         RX packets 112  bytes 13242 (12.9 KiB)
>         RX errors 0  dropped 0  overruns 0  frame 0
>         TX packets 84  bytes 10207 (9.9 KiB)
>         TX errors 0  dropped 0 overruns 0  carrier 1  collisions 0

That's systemd:
https://fedoraproject.org/wiki/Features/SystemdPredictableNetworkInterfaceNames

> On F20 the same hardware (note the MAC address) gives this:
> 
> p6p1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
>         inet 10.134.30.143  netmask 255.255.255.0  broadcast 10.134.30.255
>         inet6 fe80::20b:eff:fe0f:ed  prefixlen 64  scopeid 0x20<link>
>         ether 00:0b:0e:0f:00:ed  txqueuelen 1000  (Ethernet)
>         RX packets 1233320  bytes 144491797 (137.7 MiB)
>         RX errors 0  dropped 0  overruns 0  frame 0
>         TX packets 2058583  bytes 2951769070 (2.7 GiB)
>         TX errors 0  dropped 0 overruns 0  carrier 1  collisions 0

That's biosdevname:
https://fedoraproject.org/wiki/Features/ConsistentNetworkDeviceNaming

In Fedora 21 we've more or less dropped biosdevname in favour of
systemd. systemd's system is a cleaner implementation and the weight of
opinion favours the systemd approach to naming. See the discussion from
https://bugzilla.redhat.com/show_bug.cgi?id=965718#c76 onwards.

>From F21 onwards new Fedora installations should reliably result in the
use of the systemd naming scheme. Existing installs that use biosdevname
will continue to use it (with the same naming scheme, obviously) unless
the admin intervenes.

We should probably put this in the release notes.