[Nix-dev] When creating a bridge interface, the bridge doesn't appear

[Matthew Robbetts]

Hi list,

(I filed an issue at GitHub (https://github.com/NixOS/nixpkgs/issues/16230 <https://github.com/NixOS/nixpkgs/issues/16230>), but realized that since it’s probably a PEBKAC issue, the mailing list might be more suitable. Sorry for the cross-post!)


I am configuring a new nixOS system. My machine has two ethernet interfaces (enp3s0 and enp4s0) and one wireless interface (wlp5s0). I want to bridge the wireless with one of the ethernets, so in my configuration.nix I add:

networking = {
    ...
    bridges.br0.interfaces = [ "enp4s0" "wlp5s0" ];
    ...
and run nixos-rebuild switch.

I observe in the output that, among other things, a
/nix/store/z18i1q0r4i2bn0vkpcz45d10nn0628nf-unit-br0-netdev.service/br0-netdev.service
is created. However, ifconfig does not show the new bridge interface.

If I manually run:
systemctl start br0-netdev.service

the bridge interface appears.

Probably I am doing something wrong, but I would have expected the bridge to appear immediately as a result of nixos-rebuild switch.

Anyone have an opinion?


Thanks,
Matt
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