multihoming

[mic92]

multihoming

[Mic92]

The patch was applied to master in ce3bbd0 and c20ddde

[teto]

what about the multihoming issue ? it seems to work fine with the nixos/tests infrastructure. There seems to be some related code (to vlans) in nixos/lib/testing.nix but it doesn't seem called in nixos-shell

[teto]

I managed to come up in my vm.nix with sthg like

let
  vlans = [ 1 2];
  zeroPad = n: if n < 10 then "0${toString n}" else toString n;

  # see https://wiki.qemu.org/Documentation/Networking 's doc
  qemuNICFlags = nic: net: machine:
    [ "-device virtio-net-pci,netdev=vlan${toString nic},mac=52:54:00:12:${zeroPad net}:${zeroPad machine}"
      "-netdev user,id=vlan${toString nic}"
    ];

in
{
  virtualisation.qemu.options = with pkgs.lib; let
              m = {snd = 1;};
              interfacesNumbered = zipLists vlans (range 1 255);
              interfaces = flip map interfacesNumbered ({ fst, snd }:
                nameValuePair "eth${toString snd}" { ipv4.addresses =
                  [ { address = "192.168.${toString fst}.${toString m.snd}";
                      prefixLength = 24;
                  } ];
                });
    in
      flip map interfacesNumbered
        ({ fst, snd }: qemuNICFlags snd fst m.snd);
}

actually the doc of virtualisation.qemu.vlans is a bit misleading as it will work only with extra code (as in nixos tests). Also I wanted to run my own kernel but qemu-vm hardcodes it. Hopefully qemu uses the last parameter set on the command line so I can still override the nixpkgs one.
I might have a look at improving qemu-vm.nix. The pasted code uses SLIRP which seems to be bad for perf. maybe nixos-shell could run some VDE logic as the nixos tests. Anyway that should be good for now on my side.