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FTP is an older unsecure protocol to transfer files (1972. extended 1985). It is considered deprecated but it's still widely used.
An improved sucessor implementing transport security is the FTPS protocol.

FTP uses Port-20-tcp for the data connection and Port-21-tcp for the control connection.
It requires special treatment in firewalls like the Fritzbox SPI firewall due to its 2 ports.


In FRITZ!OS FTP is one of the protocols to access the NAS, if enabled, served by the ftpd (lincmd) daemon.
In recent firmware ftpd (lincmd) is launched as an inetd service defined in inetd.conf using the wrapper script inetdftp.

Other programs which use FTP are the BusyBox-Commands ftpget and ftpput.

The commands evaput (5188) and ar7-lite (5590) as well as the bootloaders ADAM2 / EVA use a limited subset of FTP.


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