Network Security Tips
Anyone who administers a system connected to the Internet needs to know something about network security. It’s not uncommon for systems connected to the Internet to be probed by would-be hackers several times daily. If a would-be hacker manages to detect a vulnerability, the hacker can often exploit it in a matter of seconds. Therefore, it’s almost certain that a system administrator ignorant of network security will eventually suffer a system break-in.
Network security is a large and sophisticated topic that can be only cursorily surveyed in a book such as this. Concerned readers should consult books such as the following:
Building Internet Firewalls, Second Edition, by Elizabeth D. Zwicky, Simon Cooper, and D. Brent Chapman (O’Reilly)
Building Secure Servers with Linux , by Michael D. Bauer (O’Reilly).
Computer Security Basics, by Deborah Russell and G.T. Gangemi, Sr. (O’Reilly)
Linux Security Cookbook , by Daniel J. Barrett, Richard Silverman, Robert G. Byrnes (O’Reilly).
Linux Server Hacks , by Rob Flickenger (O’Reilly).
Practical Unix & Internet Security, 3rd. ed., by Simson Garfinkel, Gene Spafford, and Alan Schwartz (O’Reilly).
Red Hat Linux Firewalls , by Bill McCarty (Red Hat Press).
If a sufficiently skilled hacker is intent on compromising a system you administer, the hacker will probably succeed. However, here are some tips that can help you avoid falling victim to amateur hackers:
Use a network or host firewall to prevent outsiders from accessing ...
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