Matt Domsch wrote:
2) udev may have rules to change the device names. This is most often
seen in the '70-persistent-net.rules' file. Here we have
additional challenges:
...
c) udev may not always be able to change a device's name. If udev
uses the kernel assignment namespace (ethN), then a rename of
eth0->eth1 may require renaming eth1->eth0 (or something else).
Udev operates on a single device instance at a time, it becomes
difficult to switch names around for multiple devices, within
the single namespace.
I would classify this as a bug, especially the fact that udev doesn't
undo a failed rename, so you end up with ethX_rename. Virtual devices
using the same MAC address trigger this reliably unless you add
exceptions to the udev rules.
You state that it only operates on one device at a time. If that is
correct, I'm not sure why the _rename suffix is used at all instead
of simply trying to assign the final name, which would avoid this
problem.
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