More on Telnet: the
Number One Hacker Tool
How to Turn off a Telnet Server on your
Unix-type Computer
If you go online with Linux or other Unix-type computer, a
telnet server is the easiest way to ensure you get destroyed
by a malicious hacker. Here's how to prevent this. On most of
these, the file /etc/inetd.conf launches most of your servers.
Edit the file to put a "#" in front of the line that
has telnet in it and either reboot your computer or kill and
restart inetd.
If your computer doesn't use inetd to launch services, you
should be able to find telnetd under /etc/init.d.
Install ssh instead and only use that to log into your shell
account.
How to Explore Computers
Using Telnet
Even if a computer doesn't have a telnet server, there are
lots of fun and even legal things to do to it using telnet. The
easiest thing to do is extract "banners" from a victim
computer. A banner is a message a computer will often give when
you telnet to a port that is running an Internet server of some
sort.
For example, most mail sending servers use port 25. To telnet
to port 25 from Win 2000 or a Unix shell, simply type:
telnet <hostname or IP address> 25
Windows 95, 98 and NT make it a tiny bit harder. Figure 2
shows how:
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