diff --git a/modules/mosh.sys.nix b/modules/mosh.sys.nix
index 193f661..33571cd 100644
--- a/modules/mosh.sys.nix
+++ b/modules/mosh.sys.nix
@@ -2,12 +2,24 @@
 , lib
 , config
 , ...
-}: {
-  environment.systemPackages = [ pkgs.mosh ];
-  networking.firewall = lib.mkIf config.networking.firewall.enable {
-    allowedUDPPortRanges = [
-      { from = 60000; to = 61000; } # mosh
-    ];
+}:
+let cfg = config.mod.mosh; in
+{
+  options.mod.mosh = {
+    enable = lib.mkOption {
+      type = lib.types.bool;
+      description = "enable mosh";
+      default = true;
+      example = false;
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.mosh ];
+    networking.firewall = lib.mkIf config.networking.firewall.enable {
+      allowedUDPPortRanges = [
+        { from = 60000; to = 61000; } # mosh
+      ];
+    };
   };
 }
 
diff --git a/modules/tailscale.sys.nix b/modules/tailscale.sys.nix
index f926523..6e3e1bb 100644
--- a/modules/tailscale.sys.nix
+++ b/modules/tailscale.sys.nix
@@ -2,48 +2,53 @@
 , config
 , lib
 , ...
-}: {
-  environment.systemPackages = [ pkgs.tailscale ];
-  services.tailscale.enable = true;
-
-  systemd.services.tailscale-autoconnect = {
-    description = "Automatically connects to Tailscale";
-
-    # make sure tailscale is running before trying to connect to tailscale
-    after = [ "network-pre.target" "tailscale.service" ];
-    wants = [ "network-pre.target" "tailscale.service" ];
-    wantedBy = [ "multi-user.target" ];
-
-    # set this service as a oneshot job
-    serviceConfig.Type = "oneshot";
-
-    # have the job run this shell script
-    script = ''
-      # wait for tailscaled to settle
-      sleep 2
-      # check if we are already authenticated to tailscale
-      status="$(${pkgs.tailscale}/bin/tailscale status -json | ${pkgs.jq}/bin/jq -r .BackendState)"
-      if [ $status = "Running" ]; then # if so, then do nothing
-        exit 0
-      fi
-
-      # ${pkgs.tailscale}/bin/tailscale up # blocks, doesn't give url
-      # This time, configure device auth so that we authenticate from portal
-      # https://tailscale.com/kb/1099/device-authorization/#enable-device-authorization-for-your-network 
-      ${pkgs.tailscale}/bin/tailscale up -authkey tskey-auth-kJcgTG5CNTRL-PUVFkk31z1bThHpfq3FC5b1jcMmkW2EYW
-    '';
+}: let cfg = config.mod.tailscale; in {
+  options.mod.tailscale = { 
+    enable = lib.mkEnableOption "tailscale";
   };
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages = [ pkgs.tailscale ];
+    services.tailscale.enable = true;
 
-  networking.firewall = lib.mkIf config.networking.firewall.enable {
-    trustedInterfaces = [
-      "tailscale0"
-    ];
-    allowedUDPPorts = [
-      config.services.tailscale.port
-    ];
-    allowedTCPPorts = [
-      22
-    ];
-    checkReversePath = "loose";
+    systemd.services.tailscale-autoconnect = {
+      description = "Automatically connects to Tailscale";
+
+      # make sure tailscale is running before trying to connect to tailscale
+      after = [ "network-pre.target" "tailscale.service" ];
+      wants = [ "network-pre.target" "tailscale.service" ];
+      wantedBy = [ "multi-user.target" ];
+
+      # set this service as a oneshot job
+      serviceConfig.Type = "oneshot";
+
+      # have the job run this shell script
+      script = ''
+        # wait for tailscaled to settle
+        sleep 2
+        # check if we are already authenticated to tailscale
+        status="$(${pkgs.tailscale}/bin/tailscale status -json | ${pkgs.jq}/bin/jq -r .BackendState)"
+        if [ $status = "Running" ]; then # if so, then do nothing
+          exit 0
+        fi
+
+        # ${pkgs.tailscale}/bin/tailscale up # blocks, doesn't give url
+        # This time, configure device auth so that we authenticate from portal
+        # https://tailscale.com/kb/1099/device-authorization/#enable-device-authorization-for-your-network 
+        ${pkgs.tailscale}/bin/tailscale up -authkey tskey-auth-kJcgTG5CNTRL-PUVFkk31z1bThHpfq3FC5b1jcMmkW2EYW
+      '';
+    };
+
+    networking.firewall = lib.mkIf config.networking.firewall.enable {
+      trustedInterfaces = [
+        "tailscale0"
+      ];
+      allowedUDPPorts = [
+        config.services.tailscale.port
+      ];
+      allowedTCPPorts = [
+        22
+      ];
+      checkReversePath = "loose";
+    };
   };
 }
diff --git a/native_configs/ssh/config b/native_configs/ssh/config
index 13a3cea..a1b2f67 100644
--- a/native_configs/ssh/config
+++ b/native_configs/ssh/config
@@ -47,3 +47,8 @@ Host mokoi
     User ubuntu_admin
     Port 22
 
+Host noami
+    HostName 10.100.200.230
+    User htran
+    Port 22
+
diff --git a/nix-conf/system/configuration.nix b/nix-conf/system/configuration.nix
index 1ab2020..e4318dd 100755
--- a/nix-conf/system/configuration.nix
+++ b/nix-conf/system/configuration.nix
@@ -11,9 +11,11 @@ in
 with lib;
 {
   imports = (if includeHardware then [
-    ./profiles/${hostname}/hardware-configuration.nix
+    "${proj_root}/hosts/${hostname}/hardware-configuration.nix"
   ] else [ ]) ++ [
     "${modulesPath}/profiles/minimal.nix"
+    "${proj_root}/modules/tailscale.sys.nix"
+    "${proj_root}/modules/mosh.sys.nix"
   ];
   boot = _boot;
 
@@ -54,67 +56,6 @@ with lib;
     pkgs.inetutils # network diag
     pkgs.mtr # network diag
     pkgs.sysstat # sys diag
-    pkgs.mosh # ssh-alt; parsec-like
-    pkgs.tailscale # VPC
   ];
-  # tailscale is mandatory : ^)
-  # inherit services;
-  services = lib.recursiveUpdate _services {
-    tailscale.enable = true;
-    ntp.enable = true;
-  };
-  # create a oneshot job to authenticate to Tailscale
-  systemd.services.tailscale-autoconnect = {
-    description = "Automatic connection to Tailscale";
-
-    # make sure tailscale is running before trying to connect to tailscale
-    after = [ "network-pre.target" "tailscale.service" ];
-    wants = [ "network-pre.target" "tailscale.service" ];
-    wantedBy = [ "multi-user.target" ];
-
-    # set this service as a oneshot job
-    serviceConfig.Type = "oneshot";
-
-    # have the job run this shell script
-    script = ''
-      # wait for tailscaled to settle
-      sleep 2
-      # check if we are already authenticated to tailscale
-      status="$(${pkgs.tailscale}/bin/tailscale status -json | ${pkgs.jq}/bin/jq -r .BackendState)"
-      if [ $status = "Running" ]; then # if so, then do nothing
-        exit 0
-      fi
-
-      # ${pkgs.tailscale}/bin/tailscale up # blocks, doesn't give url
-      # This time, configure device auth so that we authenticate from portal
-      # https://tailscale.com/kb/1099/device-authorization/#enable-device-authorization-for-your-network 
-      ${pkgs.tailscale}/bin/tailscale up -authkey tskey-auth-kJcgTG5CNTRL-PUVFkk31z1bThHpfq3FC5b1jcMmkW2EYW
-    '';
-  };
-  # Don't touch networking.firewall.enable, just configure everything else.
-  # inherit networking;
-  # inherit _networking;
-  networking = lib.recursiveUpdate _networking {
-    firewall =
-      if _networking ? firewall.enable && _networking.firewall.enable then {
-        trustedInterfaces = _networking.firewall.trustedInterfaces or [ ] ++ [
-          "tailscale0"
-        ];
-        allowedUDPPorts = _networking.firewall.allowedUDPPorts or [ ] ++ [
-          config.services.tailscale.port
-        ];
-        allowedTCPPorts = _networking.firewall.allowedTCPPorts or [ ] ++ [
-          22
-        ];
-        allowedUDPPortRanges = _networking.firewall.allowedUDPPortRanges or [ ] ++ [
-          { from = 60000; to = 61000; } # mosh
-
-        ];
-        checkReversePath = "loose";
-      } else { enable = false; };
-  };
-
-  environment.noXlibs = lib.mkForce false;
-
 }
 
diff --git a/nix-conf/system/flake.nix b/nix-conf/system/flake.nix
index 31f4dde..ed34adc 100644
--- a/nix-conf/system/flake.nix
+++ b/nix-conf/system/flake.nix
@@ -56,6 +56,7 @@
           ./configuration.nix
           {
             system.stateVersion = "22.05";
+            mod.tailscale.enable = true;
           }
         ];
         specialArgs = {
@@ -205,6 +206,37 @@
           hostname = "nixos";
         };
       };
+      nixosConfigurations.htran-dev = nixpkgs.lib.nixosSystem {
+        system = "x86_64-linux";
+        modules = base_modules ++ [
+          ./configuration.nix
+          {
+            system.stateVersion = "22.11";
+            mod.tailscale.enable = false;
+            networking.defaultGateway = {
+              address = "10.100.200.1";
+              # interface = "ens32";
+            };
+            networking.interface.ens32.ipv4.addresses = [
+              {address = "10.100.200.230"; prefixLength = 24;}
+            ];
+          }
+        ];
+        specialArgs = {
+          hostname = "htran-dev";
+          _networking = {
+            firewall.enable = true;
+            useDHCP = false;
+            interfaces.eth0.useDHCP = true;
+          };
+          _boot.loader.grub.enable = true;
+          _boot.loader.grub.version = 2;
+          _services.openssh = {
+            permitRootLogin = "no";
+            enable = true;
+          };
+        };
+      };
       nixosConfigurations.bao = nixpkgs.lib.nixosSystem {
         system = "x86_64-linux";
         specialArgs.hostname = "bao";
@@ -260,14 +292,15 @@
               services.xserver.displayManager.sddm.enable = true;
               services.xserver.desktopManager.plasma5 = {
                 enable = true;
-                excludePackages = let plasma5 = pkgs.libsForQt5; in [
-                  plasma5.elisa # audio viewer
-                  plasma5.konsole # I use alacritty instaed
-                  plasma5.plasma-browser-integration
-                  plasma5.print-manager # will enable if I need
-                  plasma5.khelpcenter # why not just write manpages instead :(
-                  # plasma5.ksshaskpass   # pls just put prompts on my dear terminal
-                ];
+                excludePackages = let plasma5 = pkgs.libsForQt5; in
+                  [
+                    plasma5.elisa # audio viewer
+                    plasma5.konsole # I use alacritty instaed
+                    plasma5.plasma-browser-integration
+                    plasma5.print-manager # will enable if I need
+                    plasma5.khelpcenter # why not just write manpages instead :(
+                    # plasma5.ksshaskpass   # pls just put prompts on my dear terminal
+                  ];
               };
 
               # disables KDE's setting of askpassword
@@ -292,6 +325,7 @@
               hardware.pulseaudio.support32Bit = true;
               nixpkgs.config.pulseaudio = true;
               hardware.pulseaudio.extraConfig = "load-module module-combine-sink";
+              mod.tailscale.enable = true;
 
               # Sound: pipewire
               # sound.enable = false;