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-rw-r--r--nixos/lib/qemu-flags.nix5
1 files changed, 3 insertions, 2 deletions
diff --git a/nixos/lib/qemu-flags.nix b/nixos/lib/qemu-flags.nix
index b310914d36c..4774fd23168 100644
--- a/nixos/lib/qemu-flags.nix
+++ b/nixos/lib/qemu-flags.nix
@@ -9,10 +9,11 @@ let
        else pkgs.lib.toHex n);
 in
 
-{
+rec {
+  qemuNicMac = net: machine: "52:54:00:12:${zeroPad net}:${zeroPad machine}";
 
   qemuNICFlags = nic: net: machine:
-    [ "-device virtio-net-pci,netdev=vlan${toString nic},mac=52:54:00:12:${zeroPad net}:${zeroPad machine}"
+    [ "-device virtio-net-pci,netdev=vlan${toString nic},mac=${qemuNicMac net machine}"
       "-netdev vde,id=vlan${toString nic},sock=$QEMU_VDE_SOCKET_${toString net}"
     ];