[systemd-devel] networkd: Support setting mtu / mac address by interface name

Lennart Poettering lennart at poettering.net
Thu Dec 4 11:08:02 PST 2014

On Thu, 04.12.14 18:53, Tom Gundersen (teg at jklm.no) wrote:

> >> Moreover, if we
> >> give people this feature I'm pretty sure we'll get lots of people
> >> expecting it to work also for any other sort of name and getting
> >> confused when it doesn't.
> >
> > Well, this is something we can fix by documentation, no?
> >
> > Or maybe name the match option differently, maybe OriginalName= or
> > KernelName= or so, and then only matching interfaces where you know
> > that the name was selected by userspace in the first place?
> I like the idea of OriginalName, much less likely to get people
> confused. I now implemented that, with the restriction that we cannot
> match on renamed names. For now I left it open to match on ethX style
> names, as people in principle could do sensible things like
> "OriginalName=eth*" or even "OriginalName=eth0" when we know there is
> only one interface.
> One thing to consider would be to disallow renaming from a .link file
> where the OriginalName was used to match. That way we don't have the
> somewhat odd situation that a .link file can only be applied once (we
> do not remember the original name, so cannot match on that the second
> time around, as that would be a mess)...

Maybe we should even store the original name in a udev property, so
that we can make this fully idempotent simply because we can always
check this new property for the original name passed down from the


Lennart Poettering, Red Hat

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