[Nix-dev] networking.wlanInterfaces issues

[Kirill Elagin]

On Sat, May 27, 2017 at 10:28 PM Tomas Hlavaty <tom at logand.com> wrote:

> Hi,
>
> I have issues with wifi configuration on 17.03.1203.58e227052d
> (Gorilla):
>
> 1) specifying mac address doesn't work:
>
>    building the system configuration...
>    error: undefined variable ‘device’ at
> /nix/store/nm3nvlszbsg7c574airhra5gj2xwc9s8-nixexprs.tar.xz/nixos/modules/tasks/network-interfaces.nix:1120:89
>    (use ‘--show-trace’ to show detailed location information)
>
>    with config like this:
>
>    networking.wlanInterfaces = {
>      wlan1 = {
>        device = "wlan0";
>        mac = "12:34:56:78:90:12";
>      };
>    }
>
>    Commenting out the mac line avoids the error but doesn't set the mac
>    address.
>

This should help: https://github.com/NixOS/nixpkgs/pull/26170.


> 2) What is wlanInterfaces supposed to do?  It does nothing as far as I
>    can see.  In the example above, I would expect that "ip a" doesn't
>    show wlan0 anymore but shows wlan1 instead.  Is my expectation
>    correct?
>
> 3) How can I set a wireless interface to ad-hoc mode?  The device
>    supports it, but wlanInterfaces does nothing again:
>
>    $ iw list | grep -i ibss\\.
>            Device supports RSN-IBSS.
>            Device supports HT-IBSS.
>
>    networking.wlanInterfaces = {
>      wlan1 = {
>        type = "ibss";
>        device = "wlan0";
>        mac = "12:34:56:78:90:12";
>      };
>    }
>

https://github.com/NixOS/nixpkgs/blob/953616907493c5b81ba3ec9dd86f1422f4d1fcd3/nixos/modules/tasks/network-interfaces.nix#L816

Your wireless card is a “physical” device, on top of it you can create a
number of “virtual” interfaces (e.g. `wlan0`). The `device` attribute
inside `wlanInterfaces` refers to this physical device, not virtual
interface (you need something along the lines of `iw phy`, I can’t remember
exactly, I’m sorry).


> Thanks for ideas.
>
> Tomas
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