passive

The device supports the active and passive data transmission modes. In active mode, the server initiates a connection request, and the client and server need to enable and monitor a port to establish a connection. In passive mode, the client initiates a connection request, and only the server needs to monitor the corresponding port. This command is used together with the firewall function. When the client is configured with the firewall function, FTP connections are restricted between internal clients and external FTP servers if the FTP transmission mode is active. If the FTP transmission mode is passive, FTP connections between internal clients and external FTP servers are not restricted.