many changes and more modularizing

hosts/fw/modules/firefox-sync.nix

@@ -13,8 +13,8 @@ in {
     ephemeral = false; # because of ssh key
     privateNetwork = true;
     hostBridge = "server";
-    hostAddress = "10.42.97.1";
-    localAddress = "10.42.97.51/24";
+    hostAddress = "${config.networkPrefix}.97.1";
+    localAddress = "${config.networkPrefix}.97.51/24";
     bindMounts = {
       "/run/secrets/firefox-sync" = {
         hostPath = "/run/secrets/firefox-sync";
@@ -30,11 +30,11 @@ in {
         hostName = "firefox-sync";
         useHostResolvConf = false;
         defaultGateway = {
-          address = "10.42.97.1";
+          address = "${config.networkPrefix}.97.1";
           interface = "eth0";
         };
         firewall.enable = false;
-        nameservers = [ "10.42.97.1" ];
+        nameservers = [ "${config.networkPrefix}.97.1" ];
       };
 
       services.nginx.enable = true;