diff --git a/.sops.yaml b/.sops.yaml
index b23668b..e9ba820 100644
--- a/.sops.yaml
+++ b/.sops.yaml
@@ -1,6 +1,9 @@
 # Generate AGE keys from SSH keys with:
 #   ssh-keygen -A
 #   nix-shell -p ssh-to-age --run 'cat /etc/ssh/ssh_host_ed25519_key.pub | ssh-to-age'
+# update keys after addin/removing a key
+#   nix-shell -p sops --run "sops updatekeys users/secrets.yaml" users/secrets.yaml
+
 keys:
   - &admin_richie age1u8zj599elqqvcmhxn8zuwrufsz8w8w366d3ayrljjejljt2q45kq8mxw9c # cspell:disable-line
 
@@ -8,6 +11,7 @@ keys:
   - &system_brain age1jhf7vm0005j60mjq63696frrmjhpy8kpc2d66mw044lqap5mjv4snmwvwm # cspell:disable-line
   - &system_jeeves age13lmqgc3jvkyah5e3vcwmj4s5wsc2akctcga0lpc0x8v8du3fxprqp4ldkv # cspell:disable-line
   - &system_rhapsody age1ufnewppysaq2wwcl4ugngjz8pfzc5a35yg7luq0qmuqvctajcycs5lf6k4 # cspell:disable-line
+  - &system_portal_1 age1vyav6kxtvt3z4vtnkkjj38eu8hlts5m7ygyckhskvalg2gpjk52su53d0a # cspell:disable-line
 
 creation_rules:
   - path_regex: users/secrets\.yaml$
@@ -18,3 +22,4 @@ creation_rules:
           - *system_brain
           - *system_jeeves
           - *system_rhapsody
+          - *system_portal_1
diff --git a/common/optional/tailscale.nix b/common/optional/tailscale.nix
new file mode 100644
index 0000000..31528ec
--- /dev/null
+++ b/common/optional/tailscale.nix
@@ -0,0 +1,33 @@
+{
+  config,
+  inputs,
+  ...
+}:
+{
+  networking.firewall.trustedInterfaces = [ "tailscale0" ];
+
+  services.tailscale = {
+    enable = true;
+    openFirewall = true;
+    authKeyFile = config.sops.secrets.tailscale_auth_key.path;
+
+    # OAuth client secrets create ephemeral nodes by default. NixOS machines
+    # are persistent and should enroll without interactive device approval.
+    authKeyParameters = {
+      ephemeral = false;
+      preauthorized = true;
+    };
+
+    extraUpFlags = [ "--advertise-tags=tag:nixos" ];
+  };
+
+  sops = {
+    age.sshKeyPaths = [ "/etc/ssh/ssh_host_ed25519_key" ];
+
+    secrets.tailscale_auth_key = {
+      sopsFile = "${inputs.self}/users/secrets.yaml";
+      owner = "root";
+      mode = "0400";
+    };
+  };
+}
diff --git a/users/secrets.yaml b/users/secrets.yaml
index 68bc49c..c3e3c70 100644
--- a/users/secrets.yaml
+++ b/users/secrets.yaml
@@ -1,62 +1,64 @@
 richie_password: ENC[AES256_GCM,data:DMi3M8aqrQ60APIofr8wJMh+VZ14hLRxz6jWZgzswr0pV/QVSX53ShBFr90ruO3mucOLYv0l+bI31covfqMAhXWBJp9wUgtC2Q==,iv:qgtn30hZfIL4dBnQSLkjbo7zPJA4m9TR0f52sTFc0v4=,tag:ydLbcGyXjv0fE+4b5ECX5w==,type:str]
 math_password: ENC[AES256_GCM,data:ykiSr3iBHrShJarEQSJ/zuXbCPcbW2oUpaAjblu1V15ufFKVSMZM94LlpMiCYtN9cYBLs98hcMeajJbvgbwT5emPHthy9+TJDw==,iv:1TJEUo0ishqFAZiUE1473yR3RT6Gbtqt4zM+C1a1KEk=,tag:pR6jyIj+bu3XaSx5yIHSmA==,type:str]
+tailscale_auth_key: ENC[AES256_GCM,data:SZEfpVnqA84AQLA/geGsPNZfsWBktlM3Zrm7OpuSS/hCWWEKtSIbRYyovH68h8tQJBQFpv18n4oXJe9eAr6Mog==,iv:x1m6XPS/h818qNRcO+uqYjgTfd/FkxHHaSHHJrLyrp4=,tag:eOpcJIhzUWFzXTuRdS9S6w==,type:str]
+tailscale_oauth_client_id: ENC[AES256_GCM,data:+cWxKlLIcJtsLhqmZUNLVDs=,iv:qrTjhLfu82pzbZnU6BrK1n+Ncbm2Cl3MMCSTKCJ6H8U=,tag:s/N5XpLwNH1gZ+LzbqRr2g==,type:str]
 sops:
     age:
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBObHhkaFlnaG4zaTZtbkIw
-            TkxSQnMxbDNwUVo4R1VYRDNKVFRDUE9kb0ZjCnpWWElJUVNuNFBsMzZod1ZQY0Fa
-            VXgxNjZ0TUJ3cEt2OTFWL2dGY0txVHMKLS0tIHNQU3Rsanh4dkc3ZElsai9YMFdH
-            cXUzVmFxTUVIOWZVR2Fpa2crdWsrdlkKwdGLfbKWc25qfBKyd/cawiUWv9iepKHN
-            EOp/LdH2GbCfnQSVbxi28ukLHxWqOLdqMm8xSni/Of2PXvMnpdyCyQ==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBEMjQvSzZSY08vRlI0dzBP
+            YytpVlpPSGFHaTI5b2xzUkFFdEY0bVhQdGgwClM3UmM1OElpcEZTcTB0NHpSZ2d6
+            aVBpcjVIaDk3Tko1cm4xYjdkYVQ1L1EKLS0tIE1aQW95U0JIVGc4MGloSXRXc3ZS
+            a3EvU1dJdmxOeVBIS28yT3dHd2ZEYWcKv5TIqRRQs3AXER1WHEx8wotyXr2Ktxsu
+            dwldwEHyDNqwf7UgGOZu7JueeZ7y2KC8KZ7ixIdrhVaoxuLEvCg7VA==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1u8zj599elqqvcmhxn8zuwrufsz8w8w366d3ayrljjejljt2q45kq8mxw9c
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSB6R0djMTArVmFySE5DMnFr
-            WFdBUERFbE1HRVVFd0oyaXJ2eU5HUStBUFN3CnR3ckZ2bkpGZFFScHQwTlBZYTMv
-            cTBXbGVoTXlWczhId05QVjZDRzFqRjQKLS0tIDNIcVBydHYwTGRnVU1mWWk4WTlR
-            eVlwQWgxSG5SdmFrWTlOcFo5eXZONWMKgx4huoSnbkRq0wQbsYgsWUKDTxDGNvYR
-            anVMQg+c7PwDlk1V4JQZ4WrYLx63Ep5qDjGlN/Ssf2Vo6rAuuKetcA==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSByaE5jb3p3VzZ1dE05Wmlx
+            c1ZoWGhTcTRHRE9oMWtkaCtBY1l1a2QyWWlvCk9MM2FmcEZubXR1REpOcHZ6aHVE
+            UEkzbllZdkxPYzlTMHNod3VWNnhoaTgKLS0tIGVCdEpqUzhFM0swRjVjb0Z6ckFN
+            UzlYb1U4UGJqWE9oczdlNVh1S1lqL3cKSKxaJFhun2ee45I1jC55YKNdfYB8MsS+
+            dgFOFCvn/4uEcUyKZbUf0STjbIZ5eMHl8NVRTupI4tftGiE559M5Wg==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1q47vup0tjhulkg7d6xwmdsgrw64h4ax3la3evzqpxyy4adsmk9fs56qz3y
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSA2QjZYejFYbCswQjdmaDA0
-            L2ZqUUhtYU12YlpISmxueHQzRG5YL0tQNXh3CndGamMwRzYvUzkvaE9DVnMwTkNC
-            cFMxczZuOUorS3dnVUpjaVdCUjhLZ2MKLS0tIGlDeGRGa3dRbWgzT3NVYjBaYUJ4
-            VW5yeFlvWUZ5MVpNZHA5M1VXR1hxU1kKqii08/MB2aabgP4RQs1ry8AxmFqB8Mn+
-            m7B0u64aziKXLSl0u471wqgD+YGRwNcajXT2pHCy8QWLznzvIMSrxA==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSA2U01jTVZQT1RRRU1nQmVv
+            Z0lnOGJLN1c0UkNLbnJjV29na3Rub0xzbXhNCjY0aFNuUnFDUnZheDRHT3R5L3Fv
+            ZkJ3QkF2RENKRVdUYjRzRXMrNklvN2cKLS0tIFJzK2o1MmVTWHZMWmVDWlgzeGY5
+            VDg4OGl0NGFYY2VNZGY5UkR1cVdWY0UK1qa3swdfgUw1tnnThRf1sl9f2zTP/d/d
+            iwcenOEryXatVMJjZVWrLC5C7MwtKz+pIBXa98yaSpCDLqjAMwOCPg==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1jhf7vm0005j60mjq63696frrmjhpy8kpc2d66mw044lqap5mjv4snmwvwm
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBrSUc3VnllVDFZTm1jRnlP
-            ZDBqelhkeHliZ1VlcjVnblQyeFlWclZTWkZjCjhJQk5EWkVoQjdoMHg4Zko4OU1C
-            NWFnVTIwV3RYbTZSeWttaVRPbjNrMG8KLS0tIDZWUHJSbVVlR0lKUDRtc3VqOTc1
-            cGJ3NDBLem9FNUpnbStYRTlqQStHV2sKwxPe4nTULsU0mVeUh8mhr2KX9U0iT5dL
-            zvHldoQG6mZHgtHK6XI5AQJYf+zUW66OKqNSxAnn+BM20QkAQVZNVw==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBTREI2UEZwS0Y0SmEvK1F4
+            Y1hZZjRVWWxMT29mc3ZXcHFDclRUYi96LzA4CkIwZ2h4T2JQRW1OL2hmRTFHWkFY
+            RHZqQUFqU3hvNlRBZHRiSThPVUE3TG8KLS0tIHh0Z2tlNXREczJsa1g2ekZyZjBt
+            dW41aVA3VEVqa1NDMHM0T3FKZFNTN0kKGQPRUMSRtibFVFRZR/igsjgxgDo4ogga
+            dUHBRU65r41er+Wk3lKdtbXJX1g83K8ay7540hNXheOhxFi57trrzA==
             -----END AGE ENCRYPTED FILE-----
           recipient: age13lmqgc3jvkyah5e3vcwmj4s5wsc2akctcga0lpc0x8v8du3fxprqp4ldkv
         - enc: |
             -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSB0NU9ac2FuRHI1dkQycmc0
-            YlhGK29UeTdiZEZXcWtPUW4rMis4Z2NWYWpJCkVldEdMc3ZTaDFidHpaZk5mM283
-            bTd0RlN5SHVabGhjeXFnSThydnVoem8KLS0tIElWclYvTmtkb0wyNDlKT3ZEckwx
-            L2NObzZadlJ5d3MyeGRqKy95L3BOMFEKtoswi6r2TmCZzngUkiGQV5TTsuzisMFS
-            5QI0aQZwhexqUMvbPuajYKvcPj+D6a2xaxbL3TBRLjOrFmcp5J7/YA==
-            -----END AGE ENCRYPTED FILE-----
-          recipient: age1l272y8udvg60z7edgje42fu49uwt4x2gxn5zvywssnv9h2krms8s094m4k
-        - enc: |
-            -----BEGIN AGE ENCRYPTED FILE-----
-            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSByUlVjM2xpc281bHZzOGVo
-            L3VEclhJZDd5SS9mazFiTk9DcmxMaWxPT213ClNPWERKQU03OWk0OEVIY05ib2VG
-            WXhiZDhuMDZ5ZmFPWHB5RTFKYmpkVzAKLS0tIGppUndCb25wb2dyV01YbENrWjdU
-            TmMvWVpobnl0eXBIOGQwMW5BSlhJTUkKzua1artJWbZlKfzv27xfZJeBpntBYwUf
-            c8i1gNlvRwkhFAlrWcKR65vgyxsO3rbkLJRkcwG/q4hHj9zBeC/K2A==
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBrV1Z2MGNPK28wTStRSUZW
+            dmFMaUt5MENHeUpVcDVxQnZhd1o5RmJwOWwwCittaGNrcW1hV25VaGJaTEhZRFBJ
+            Y2toWEpFWFZYT0plb2lkTlJCS2Mwb3MKLS0tIHlkVjVESWFsbWlVQ0xVQ0llclF2
+            L1FMbC91YjJsR3BGRjJ0QVQ1MDdBbEUKNnOI9+H1LJcvVcwl9uQMmFp35y5RB+Zl
+            Mo3z3unweQtS+jiUn7RyVs5daG1E2tfihu2CQDWaktuCuunMpt3Wew==
             -----END AGE ENCRYPTED FILE-----
           recipient: age1ufnewppysaq2wwcl4ugngjz8pfzc5a35yg7luq0qmuqvctajcycs5lf6k4
-    lastmodified: "2026-06-29T20:19:44Z"
-    mac: ENC[AES256_GCM,data:GIvQxWt4tZGn0fyiXVtxGFQQoNcFUgilF+/PSz50exVrmzsS0XQUk/TIDFHaQR9jlJI50jqlyc1rBHgjnqC2oPHhPWaaVhgF18vQI55rGKdymNFjsHnaCkblFVdR1RJm0FSB2Ri6y5k8tfN3ywiwromJRz4NYzr1hbmr36azfg4=,iv:V3jspeYt/d2wy13gUrQmPGARm0hxwvSL/mocJAUofdw=,tag:vARoUzBWTJKkONDGoQdzNQ==,type:str]
+        - enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBqR0hUT3hxTzRwTVhuTm9E
+            TUFtNFFCYWNUNUNVbHNaNXQ0aEVBa04vSEU0CkRPVzhuYUsrM0wxZjRDdkxvTVA2
+            UW9CSjlIQW5yenhaUi9mbEdLYlhWYk0KLS0tIGRXMm9Wa3l4UWxqcGl6ZlBZV3E0
+            Z3YrbUYrSmV0NHNTeTdhMkJEdytwSmMKGLpe5+p4FGJNHy6SVgnsDbEsiP0J8lW/
+            0+3X3LQoL0f1S2L5DjexF/H0NGvWjAPaGzDNB6V50VxGDabEIVqjvQ==
+            -----END AGE ENCRYPTED FILE-----
+          recipient: age1vyav6kxtvt3z4vtnkkjj38eu8hlts5m7ygyckhskvalg2gpjk52su53d0a
+    lastmodified: "2026-08-25T15:35:53Z"
+    mac: ENC[AES256_GCM,data:4/WuSmUb2ONlB56dgbwwekZ8h7E1vvPzPxYCvNM8N68nt1nb9JxoMeAX9PktmljAarYLQJd1O5+49ZEph3Gzx9LrwvWnm9asq0UeeJi08x7wdQDcawNFlBFzXF2qlgxU1JssNHZZOB+5nYH4t8vFzPTq/9BqoifPR2+pLBYhUQI=,iv:N/gVgeWT2/1bfHuR6TanyDBijWmXAqyACXpnwfwDuVA=,tag:pQ4ct4G7SARz2wyjOc7AKQ==,type:str]
     unencrypted_suffix: _unencrypted
-    version: 3.13.1
+    version: 3.13.3