[Nix-dev] network interface naming

[Lluís Batlle i Rossell]

networking.usePredictableInterfaceNames = false;

A must since it 'appeared' and got the default true! :)

On Sun, May 11, 2014 at 10:29:45PM +0200, Mathijs Kwik wrote:
> Hi all,
> 
> Some time ago, udev changed to stable interface names for networking.
> So instead of eth0 and eth1 you would get enp0s3 (wired) and wlp1s5
> (wireless) for example. And I think there existed a (nixos?) option to
> stick to the previous behaviour for some time.
> 
> I recently upgraded an older system to our new 14.04 release and noticed
> it now uses the new naming scheme, while it previously still used the
> old scheme. I could not find the use-old-scheme option, nor did I enable
> such a thing in the past.
> 
> I do not mind the new names (actually, I prefer them), so I changed all
> references to the new names (firewall rules, custom networking setup,
> vpn tweaking). This works fine on the real system, but I run into issues
> when running such configuations in a vm. It seems qemu/kvm still has the
> guest create eth0. 
> 
> Now, I can of course parameterise the entire config by an interface name
> to easily modify the configuration for a vm build. But this is somewhat
> ugly, especially because of the networking.interfaces.<name>. attrset.
> 
> But I'm hoping there's a better/nicer way to either force some interface
> name to vms, or have the real system stick to the old naming scheme.
> 
> Any pointers?
> Thanks,
> Mathijs
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