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Perl for Web Site Management
book

Perl for Web Site Management

by John Callender
October 2001
Beginner content levelBeginner
528 pages
15h 20m
English
O'Reilly Media, Inc.
Content preview from Perl for Web Site Management

Getting Started with SSH/Telnet

You’re probably already familiar with the process of making a dial-up PPP connection to the Internet from your Windows PC or Macintosh. Once connected, you then run client software to access various Internet services: a web client (like Netscape Navigator) to access web sites, a mail client (like Netscape’s mail reader, or Eudora) to send and receive email, or an FTP client (like WS_FTP or Fetch) to transfer files. Traditionally, a Telnet client is just another piece of software that runs on top of your Internet connection. You use Telnet to log into a shell session on a remote server. Once you’re in the shell session, you type text commands into the Telnet window, and those commands are then executed on the remote server and the results sent back to you.

We’ll talk more about shell sessions. For now, let’s talk a bit more about Telnet.

There’s an inherent problem with using Telnet to connect to a remote server. Because Telnet traffic is sent across the network unencrypted, a malicious user located on a network somewhere along the path between you and the web server could easily obtain your username and password and use them to connect to the server as you. For that reason, a growing number of ISPs don’t allow customers to make Telnet connections to their servers. Instead, they require customers to use something called ssh (for secure shell), an encrypted protocol that makes it much harder for bad guys to get hold of your login information. Once ...

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Publisher Resources

ISBN: 1565926471Catalog PageErrata