Technical data

5.4.1 FTP (File Transfer Protocol)
FTP is a TCP/IP standard, high-level protocol used to transfer files bidirectionally.
FTP enables users to access files interactively, list directories on a remote host,
delete and rename files on the remote host, and transfer files between hosts.
FTP also provides authentication control, which requires users or clients to
correctly enter a login name and password to the server before requesting file
transfers. The server can refuse access if login and password combinations are
invalid.
FTP allows users who do not have a login name or a password to access certain
files on a system using an anonymous login name. This functionality is called
Anonymous FTP and might include one or more of the following restrictions:
• Limited browsing through the file system. Users can access only the anonymous
guest (or home) directory and a public directory. The public directory might
contain general bulletin information to which the user has read-only access.
• Access to files from (get) or copying files to (put) the guest directory only.
• Access to files (get) from the public directory only.
• Delete privileges for files in the guest directory that are owned by the
anonymous account.
For more information about setting up FTP, refer to the Compaq TCP/IP Services
for OpenVMS Management guide.
5.4.2 Trivial FTP (TFTP)
TFTP provides a simple, unsophisticated file transfer service. It is intended for
applications that do not need complex interactions between a client and server.
TFTP can be hardcoded in read-only memory to execute a network bootstrap
program. Once it begins execution, TFTP allows the bootstrap program to use the
same underlying protocols that the operating system uses. This makes it possible
for one host to boot from a server on another physical network.
TCP/IP Services supports downloading of system images and other types of
information for client hosts with TFTP.
TFTP transfers files from a TFTP server to diskless clients or other remote
systems. The client initiates the file transfer. If the client sends a read request to
the TFTP server, the server attempts to locate this file.
TFTP has the following characteristics:
• TFTP clients are not registered in a database.
• TFTP runs as an unprivileged user in the TCPIP$TFTP account and therefore
is restricted to files that the unprivileged user can access.
• TFTP clients are not regulated by the usual OpenVMS user security methods.
• NousernameorpasswordisrequiredtousetheTFTPservice.
For information about how to set up TFTP, refer to the Compaq TCP/IP Services
for OpenVMS Installation and Configuration manual.
5.4.3 R Commands
The TCP/IP Services software includes client and server implementations of the
Berkeley Remote (R) command applications. These applications provide users
with the following capabilities:
5–10 Network Server Services