IMDEA Networks Institute Publications Repository

An FTP Application Layer Gateway (ALG) for IPv6-to-IPv4 Translation

Van Beijnum, Iljitsch (2011) An FTP Application Layer Gateway (ALG) for IPv6-to-IPv4 Translation. [Standardization Contributions]

PDF (An FTP Application Layer Gateway (ALG) for IPv6-to-IPv4 Translation ) - Published Version
Download (26Kb) | Preview


The File Transfer Protocol (FTP) has a very long history, and despite the fact that today other options exist to perform file transfers, FTP is still in common use. As such, in situations where some client computers only have IPv6 connectivity while many servers are still IPv4-only and IPv6-to-IPv4 translators are used to bridge that gap, it is important that FTP is made to work through these translators to the best possible extent. FTP has an active and a passive mode, both as original commands that are IPv4-specific and as extended, IP version agnostic commands. The only FTP mode that works without changes through an IPv6-to-IPv4 translator is extended passive. However, many existing FTP servers do not support this mode, and some clients do not ask for it. This document specifies a middlebox that may solve this mismatch.

Item Type: Standardization Contributions
Additional Information: FTP64 was adopted by the BEHAVE working group for an application layer gateway that makes it possible for an IPv6 FTP client to connect and exchange files with an IPv4 FTP server. It has been published as RFC 6384 in October 2011. This RFC specifies an application layer gateway (ALG) that works together with NAT64 to allow the FTP protocol to work when FTP clients that only have IPv6 connectivity connect to FTP servers that only have IPv4 connectivity and don’t understand the newer commands that are used with IPv6. The FTP64 ALG modifies the commands that the FTP client sends to the FTP server and the responses from the server to the client.
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics > QA75 Electronic computers. Computer science
T Technology > T Technology (General)
T Technology > TA Engineering (General). Civil engineering (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering, Science and Mathematics > School of Electronics and Computer Science
Depositing User: Acosta Angel
Date Deposited: 14 Aug 2012 09:09
Last Modified: 07 Aug 2013 09:49

Actions (login required)

View Item View Item