This file: ftp://ftp.cert.dfn.de/pub/tools/net/ftp-PASV/01-README


information about this subdirectory:
   A FTP-client with PASV support is necessary for some firewalls,
   because FTP usually tries to open the data-connection from the server to
   the client. With a packet screen in place such a connection would
   be forbidden by the filter-rules in the packet screen. The FTP PASV-command
   tells the FTP-server not to open a connection and instead wait for
   the client to open the connection.

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file: /pub/tools/net/ftp-PASV/ftp-PASV.tar.gz	(45844 Bytes)
   This archive contains the FTP-client that is currently in use at the
   DFN-CERT.