fixup! nix/os/devices/CFB4ED74: add static ipv6 static address

nix/os/devices/CFB4ED74/system.nix

@@ -15,12 +15,17 @@ in {
     # iperf3
     5201
   ];
+
+  networking.useDHCP = true;
+  networking.usePredictableInterfaceNames = false;
   networking.interfaces.eth0 = {
-    useDHCP = true;
-    ipv6.addresses = [ {
-      address = "2a02:c207:3003:2387::1";
-      prefixLength = 64;
-    } ];
+    ipv6.addresses = [
+      { address = "2a02:c207:3003:2387::1"; prefixLength = 64; }
+    ];
+  };
+  networking.defaultGateway6 = {
+    address = "fe80::1";
+    interface = "eth0";
   };
 
   # Kubernetes
@@ -43,4 +48,12 @@ in {
       authorizedKeys = keys.users.steveej.openssh;
     };
   };
+
+  boot.initrd.postMountCommands = ''
+    for iface in $(cd /sys/class/net && ls); do
+      echo "Bringing down $iface..."
+      ip address flush dev $iface
+      ip link set $iface down
+    done
+  '';
 }