diff --git a/hosts/router.home.ts.hillion.co.uk/default.nix b/hosts/router.home.ts.hillion.co.uk/default.nix
index c5e2bd7..8a06be5 100644
--- a/hosts/router.home.ts.hillion.co.uk/default.nix
+++ b/hosts/router.home.ts.hillion.co.uk/default.nix
@@ -142,7 +142,8 @@
             };
             lease-database = {
               type = "memfile";
-              persist = false;
+              persist = true;
+              name = "/var/lib/kea/dhcp4.leases";
             };
             subnet4 = [
               {
@@ -165,25 +166,15 @@
                     data = "10.64.50.1, 1.1.1.1, 8.8.8.8";
                   }
                 ];
-                reservations = [
-                  {
-                    # tywin.storage.ts.hillion.co.uk
-                    hw-address = "c8:7f:54:6d:e1:03";
-                    ip-address = "10.64.50.20";
-                    hostname = "tywin";
-                  }
-                  {
-                    # syncbox
-                    hw-address = "00:1e:06:49:06:1e";
-                    ip-address = "10.64.50.22";
-                    hostname = "syncbox";
-                  }
-                  {
-                    # microserver.home.ts.hillion.co.uk
-                    hw-address = "e4:5f:01:b4:58:95";
-                    ip-address = "10.64.50.21";
-                    hostname = "microserver";
-                  }
+                reservations = lib.lists.imap0
+                  (i: el: {
+                    ip-address = "10.64.50.${toString (20 + i)}";
+                    inherit (el) hw-address hostname;
+                  }) [
+                  { hostname = "tywin"; hw-address = "c8:7f:54:6d:e1:03"; }
+                  { hostname = "microserver"; hw-address = "e4:5f:01:b4:58:95"; }
+                  { hostname = "theon"; hw-address = "00:1e:06:49:06:1e"; }
+                  { hostname = "server-switch"; hw-address = "84:d8:1b:9d:0d:85"; }
                 ];
               }
               {