• Halted Linux firewalls
• Web Content Filtering
• Port numbers
• Building a Secure Gateway System
• Building a Secure Gateway System II
• Securing and Optimizing Linux
• SSH JAVA Applet
• How to secure your BASH history

How to implement a halted linux firewall. Limited application but makes up for it in coolness factor.
(Halted Firewalls @ Sys Admin)

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by nil

Content filtering allows the system administrator to control access to unproductive and objectionable web sites/materials.

Content filtering may be accomplished by using a proxy server such as Squid (»www.squid-cache.org/), but frequently this is insufficient for all circumstances. Most proxy servers require you to manually add the names of sites/domains that should be blocked, by maintaining complex access control lists.

Specialized software for content filtering can not only block sites and domains contained in downloadable blacklists, but also filter based on keywords, search terms, etc.

One very powerful, yet easy to install, configure and maintain application, is DansGuardian. It works with Redhat Linux 6.2, 7.x, Madrake 8.x, Debian, Solaris and FreeBSD. It is available for download from »www.dansguardian.org/

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by Lazarus Long edited by howe81
last modified: 2002-06-05 19:17:38

The port numbers are divided into three ranges: the Well Known Ports,
the Registered Ports, and the Dynamic and/or Private Ports.

The Well Known Ports are those from 0 through 1023.

The Registered Ports are those from 1024 through 49151

The Dynamic and/or Private Ports are those from 49152 through 65535

(IANA)

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by howe81

Tips on how to build and secure your gateway.

(Linux Gazette)

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by howe81

This is part II of Building a Secure Gateway System.

(Linux Gazette)

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by howe81

How to secure and optimize your Red Hat Linux box.

(Linux Documentation Project)

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by howe81

This is a java applet link to connect to SSH (Secure Shell) servers over the Internet without having an SSH client such as SecureCRT or PUTTY.

(java-ssh)

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by howe81

Prevent unauthorized fiddling with the BASH history file.

»Securing .bash_history

Courtesy of KJ4AUR

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by No_Strings