IBM - Speaking Unix series

• Speaking UNIX, Part 1: Command the power of the command line
  
• Speaking UNIX, Part 2: Working smarter, not harder
  
• Speaking UNIX, Part 3: Do everything right from the command line
  
• Speaking UNIX, Part 4: UNIX ownership and permissions provide for privacy and participation
  
• Speaking UNIX, Part 5: Data, data everywhere
  
• Speaking UNIX, Part 6: Automate, automate, automate!
  
  Stupid, Stupid Protocols: Telnet, FTP, rsh/rcp/rlogin
  

  running ftp clients in (traditional) "active" mode requires you to open a huge port range on the client hosts. While this is mitigated by passive ftp, passive mode is impractical across a University/enterprise-sized organization, because of the intense user education cost. Even when we switch to passive mode clients, this requires the server's firewall to open up a sizable port range.