[Nix-dev] "pppd is unable to open the /dev/ppp device"

[Paul Dufresne]

Well, I said the modem module was in my experience creating /dev/ppp
but now I remember it is rather /dev/modem.

Sure, /dev/ppp exist here, c type, major 108, minor 0. (using Arch
Linux right now)
But I don't know how it is created... oh wait:
Accordint to http://linmodems.technion.ac.il/archive-fourth/msg03622.html
it is created by the module ppp_generic.

I believe UDEV allows to give a specific name to the device, but that
the kernel would create it with default name, without any user mode
UDEV rules. Well, I have quite a fuzzy knowledge of UDEV, don't thrust
too much what I say.

So, if /dev/ppp is not there for you I would guess you don't have
ppp_generic listed in lsmod.

Now, I don't know how the module is suppose to be loaded under NixOS.