+dit(bf(ftp))
+FTP URis; ftp::Proxy is the default proxy server to use. It is in the
+standard form of em(http://[[user][:pass]@]host[:port]/) and is overriden
+by the ftp_proxy environment variable. To use a ftp proxy you will have to
+set the ftp::ProxyLogin script in the configuration file. This entry
+specifies the commands to send to tell the proxy server what to connect
+to. Please see em(/usr/doc/apt/examples/apt.conf) for an example of how
+to do this. The subsitution variables available are $(PROXY_USER),
+$(PROXY_PASS), $(SITE_USER), $(SITE_PASS), $(SITE), and $(SITE_PORT).
+Each is taken from it's respective URI component.
+
+Several settings are provided to control passive mode. Generally it is safe
+to leave passive mode on, it works in nearly every environment. However some
+situations require that passive mode be disabled and port mode ftp used
+instead. This can be done globally, for connections that go through a proxy
+or for a specific host (See the sample config file for examples)
+