diff --git a/hosts/workstation/systemd.nix b/hosts/workstation/systemd.nix
index 59d9f56..e12d31e 100644
--- a/hosts/workstation/systemd.nix
+++ b/hosts/workstation/systemd.nix
@@ -48,8 +48,28 @@ in {
           '';
           serviceConfig = { Type = "oneshot"; };
         };
+        check-nic = {
+          description = "Adjust tailscale MTU based on location";
+          unitConfig = {
+            Type = "simple";
+          };
+          serviceConfig = {
+            Type = "oneshot";
+            Environment =
+              "PATH=/run/current-system/sw/bin:/etc/profiles/per-user/don/bin:/home/don/bin";
+            ExecStart = "/home/don/bin/check-nic";
+          };
+        };
       };
       timers = {
+        check-nic = {
+          wantedBy = [ "timers.target" ];
+          partOf = [ "check-nic.service" ];
+          timerConfig = {
+            OnCalendar = "1m";
+            Unit = "check-nic.service";
+          };
+        };
         detect-reboot-for-upgrade = {
           wantedBy = [ "timers.target" ];
           partOf = [ "detect-reboot-for-upgrade.service" ];