Re: [gentoo-user] network interface names in gentoo

[Simon Thelen]

On 17-06-11 at 16:33, Ian Zimmerman wrote:
> Without tweaking anything in particular (as far as I remember), I get
> the "predictable" names.  For example, on the desktop box where I'm
> writing this, the main interface is enp3s0.
>
> But, of course, there's no systemd on this box, and never has been.  So,
> reading [1], I am somewhat puzzled: that page sure makes it sound as if
> systemd was responsible for the new style names.  What is the mechanism
> by which they appear on gentoo, if not systemd?
Quoting from the sys-fs/eudev-3.2.2-r1 ebuild:
pkg_pretend() {
	ewarn
	ewarn "As of 2013-01-29, ${P} provides the new interface renaming functionality,"
	ewarn "as described in the URL below:"
	ewarn "https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames"
	ewarn
	ewarn "This functionality is enabled BY DEFAULT because eudev has no means of synchronizing"
	ewarn "between the default or user-modified choice of sys-fs/udev.  If you wish to disable"
	ewarn "this new iface naming, please be sure that /etc/udev/rules.d/80-net-name-slot.rules"
	ewarn "exists: touch /etc/udev/rules.d/80-net-name-slot.rules"
	ewarn
}

and from sys-fs/udev-233:
	elog
	elog "Starting from version >= 197 the new predictable network interface names are"
	elog "used by default, see:"
	elog "https://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames"
	elog "https://cgit.freedesktop.org/systemd/systemd/tree/src/udev/udev-builtin-net_id.c"
	elog
	elog "Example command to get the information for the new interface name before booting"
	elog "(replace <ifname> with, for example, eth0):"
	elog "# udevadm test-builtin net_id /sys/class/net/<ifname> 2> /dev/null"
	elog
	elog "You can use either kernel parameter \"net.ifnames=0\", create empty"
	elog "file /etc/systemd/network/99-default.link, or symlink it to /dev/null"
	elog "to disable the feature."

Depending on which of those you have installed.

-- 
Simon Thelen