keepalive

systems/gateway/default.nix

@@ -14,6 +14,9 @@ in {
     settings = {
       PasswordAuthentication = false;
       PermitRootLogin = "prohibit-password";
+      ClientAliveInterval = 60;
+      ClientAliveCountMax = 3;
+      TCPKeepAlive = true;
     };
   };
   users.users = lib.mapAttrs (name: userList: {