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Coping With FTP

FTP is one of those protocols that you just have to sit back and ask "What the heck were they thinking?" FTP has many problems that the firewall administrator needs to deal with. What's worse, the problems the administrator must face are different between making ftp clients work and making ftp servers work.

Within the FTP protocol, there are two forms of data transfer, called active and passive. Active transfers are those where the server connects to an open port on the client to send data. Conversely, passive transfers are those where the client connects to the server to recieve data.