[Nix-dev] network interface naming

[Mathijs Kwik]

Lluís Batlle i Rossell <viric at viric.name> writes:

> networking.usePredictableInterfaceNames = false;
>

:) I must have been sleepy

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

I wonder why this didn't affect me sooner. My system was upgraded just 2
or 3 months back, but kept on using 'eth0' (as that's what I used in
network.interfaces and other places). Probably systemd-212 became a bit
more aggressive about interface naming.

Anyway, thanks!


>
> 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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