The ftp server port command sets the FTP server IPv4 listen port.
The undo ftp server port command resets the FTP server IPv4 listen port to default value.
By default, FTP server listen port is 21.
Usage Scenario
By default, the listening port number of an FTP server is 21. You can directly log in to the device without specifying the port number. Attackers may access the default listening port, consuming bandwidth, deteriorating server performance, and causing authorized users unable to access the server. To improve security, run this command to change the listening port number of the FTP server. After that, attackers are deprived of information about the newly configured listening port number, and the FTP server is thus well protected.
The command ftp server port sets the FTP server listen port.
Configuration Impact
The FTP server closes all FTP connection and uses the new listening port.
If the listening port number of the FTP server is 21, the FTP client can log in to the FTP server without specifying the port number. If the listening port number of the FTP server is not 21, the FTP client needs to specify the port number when trying to log in to the FTP server. The specified port number must be identical with the listening port number of the FTP server.