WebProNews

Understanding the FTP PORT Command

You may already know that when FTP (File Transfer Protocol) commands cross the wire, they use port 21 by default. You may also know that port 20 is assigned to FTP data. Unfortunately, most FTP data sessions do not actually use port 20.

Operating System Concepts

The CPU (Central Processing Unit) is the heart of any computer, but the operating system is the brain. Unfortunately, understanding exactly how these things really work can be difficult, because it's fairly hard to "play" with the operating system that you are actually using. You can do quite a bit with sophisticated debuggers, but eventually you run into confusion and difficulty.

DSL and Cable Modem Security

Although high speed internet access may not have reached you yet, it probably will soon. The advantages are obvious, but there's a dark side: security. I'm not going to talk about the more general aspects of securing your system here (I've done that in General Security), but only specifically about the issue of clear text passwords with telnet, pop, and ftp.

Java FTP client libraries reviewed

This article explains how to write FTP client code in Java using available libraries. It compares an exhaustive list of FTP libraries, presents pros and cons of each library, and helps decision makers choose the most appropriate one for their needs.

Library Cross Reference

This is a cross reference of libraries needed by Skunkware and other binary packages and where to obtain the library or other needed tool. You know you need a library when the program fails to work; sometimes it is friendly enough to tell you what it needs, but sometimes it is not.