This paper will discuss the common Internet application “FTP” and its interaction with equally-common Internet
Firewalls. In general, non-technical terms, FTP is used to transfer files from one machine to another. Its download capability has been incorporated into most common web-browsers as one method of point-and-click downloading.
And, in non-technical term, Firewalls are typically used to restrict the Internet traffic that can reach a specific set of machines with the intent of protecting those machines from troublesome and potentially malicious Internet traffic. Some Internet services pose special difficulties for firewalls, especially firewalls that also provide Network Address Translation (NAT) capability, and causes them to be identified as “problem services’. This paper focuses on the oldest of the “problem
services” – the File Transfer Protocol or FTP.
Because FTP was designed for ease of use in an era when network security was a distant consideration, its design is often at cross-purposes with the restrictions imposed by modern firewalls. Careful examination of these interactions, and consideration of ways in which careful firewall design can avoid or minimize most of the problems, can provide a basis for developing methods of accommodating similar limitations that appear as new “problem services” come into being.
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