[[...]]


[FTP] command issued as part of setting up a transfer with the connection connection direction being in the same direction as the command channel (i.e. the FTP server creates a temporary server socket and it is up to the client to connect to it.)






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http://compnetworking.about.com/library/glossary/bldef-pasv.htm




RFC 478
[http://www.faqs.org/rfcs/rfc478.html]:
"Server-Server Interaction"

RFC 1579
[http://www.faqs.org/rfcs/rfc1579.html]:
"Firewall-friendly FTP"

RFC 959
[http://www.faqs.org/rfcs/rfc959.html]
"File Transfer Protocol"