File Transfer Protocol (FTP), a List of FTP Commands
FTP is a TCP based service exclusively. There is no UDP component to FTP. FTP is an unusual service in that it utilizes two ports, a 'data' port and a 'command' port (also known as the control port). Traditionally these are port 21 for the command port and port 20 for the data port. The confusion begins however, when we find that depending on the mode, the data port is not always on port 20.
Attempted to follow this procedure. It is incorrect for SLES 11 SP1, SP2, SP3 and SP4. The advice "Go into YAST. "Choose/install packages"->"Install packages" Hit Type in the directory path where the downloaded HylaFAX rpm is. Hit to show a list of all files. Choose and install." makes no sense, as such a sequence doesn't exist in YaST.
The original specification for the File Transfer Protocol was written by Abhay Bhushan and published as RFC 114 on 16 April 1971. Until 1980, FTP ran on NCP , the predecessor of TCP/IP .  The protocol was later replaced by a TCP/IP version, RFC 765 (June 1980) and RFC 959 (October 1985), the current specification. Several proposed standards amend RFC 959 , for example RFC 1579 (February 1994) enables Firewall-Friendly FTP (passive mode), RFC 2228 (June 1997) proposes security extensions, RFC 2428 (September 1998) adds support for IPv6 and defines a new type of passive mode. 
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In this screen you can add or remote file extensions of files that you wish to be transferred in ascii mode. The most common file extensions are already listed.