Re: Proposal: enable stateless persistant network interface names
On Fri, 8 May 2015 10:50:30 -0700, Josh Triplett
<josh@joshtriplett.org> wrote:
>Karsten Merker wrote:
>> while this probably works resonably well for (semi-)fixed devices
>> like onboard-NICs and PCI/PCIe cards, it results in a completely
>> unsuitable behaviour with pluggable devices such as USB network
>> adapters. When using ifnames, the interface name depends on the
>> USB port into which the device is currently plugged and the
>> interface name changes when one uses a USB hub or plugs the
>> device into another host port. This would mean that a user would
>> always have to plug his USB network device into the same port
>> that was used during initial setup to keep it working, and
>> one-off use of a USB hub would require changing the network
>> configuration. Despite the problems of the MAC-based system
>> that we use currently, the ifnames method appears way worse
>> to me than what we have now.
>
>That would only be a problem if you're using ifupdown and its hardcoded
>network interface names. Other network software handles dynamic names.
Do we have other network software other than ifupdown,
systemd-networkd and network-manager, the latter handling dynamic
names rather ungracefully.
>Without this, you can't reliably use a system with *two* USB network
>devices, because they won't consistently come up with the same names.
>Or, for that matter, a system with a built-in network interface and a
>USB network interface.
The current, purely udev-based method with persistent net generator
foo will note the MAC address of the USB interface and make sure that
it always gets the same ethX name. It is even possible to hand-edit
70-persistent-net.rules and make it come up as usbeth0, regardles of
the port it is being plugged in.
Greetings
Marc, seeing Karsten's point
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