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- Use port knocking for a more secure method of opening ports
- Every open port on a firewall or a router is a security risk. That's why a technique called "port knocking" can be valuable. Port knocking is a method of allowing access to firewalled services given a preconfigured "knock." The knock consists of a sequence of access attempts to closed ports...
- Tags: security, Thomas Nooning CCNA, CCDA
- Technical articles 2004-12-15
- Take advantage of antispam options for Sendmail
- Over the last few years, there has been an ever-increasing need for tools to combat the endless stream of spam choking mailboxes everywhere. Despite progressive legislation toward this goal, there are few signs that an end is near. While politicians and industry heavyweights debate the future of e-mail, it is...
- Tags: anti-spam, e-mail, relay, Sendmail Inc., server, spam, Thomas Nooning CCNA, CCDA
- Technical articles 2004-10-15
- Analog, AWStats, and Webalizer offer powerful Apache logging
- When most administrators think of log analyzers for Webservers, they typically view them as being useful for monitoring Web traffic.However, these log analyzers can also be useful for performance tuning andsecurity auditing, as well as helping to meet the demand for certain types ofcontent on the Web site. For ApacheĀthe...
- Tags: Analog, analyzer, Apache Software Foundation, log analyzer, Thomas Nooning CCNA, CCDA
- Technical articles 2004-06-09
- Use these built-in antispam techniques for protecting Sendmail
- With a large percentage of e-mail being unsolicited—and that number is increasing every day—there's a growing need to tighten e-mail policies in an effort to block spam. The creators of Sendmail are certainly aware of this issue and continue to create antispam options for mail administrators. Later versions of Sendmail...
- Tags: Sendmail Inc., Thomas Nooning CCNA, CCDA, anti-spam, technique
- Technical articles 2004-05-12
- Take advantage of antispam options for Sendmail
- Over the last few years, there has been an ever-increasing need for tools to combat the endless stream of spam choking mailboxes everywhere. Despite progressive legislation toward this goal, there are few signs that an end is near. While politicians and industry heavyweights debate the future of e-mail, it is...
- Tags: anti-spam, e-mail, e-mail server, open relay, relay, Sendmail Inc., server, spam, Thomas Nooning CCNA, CCDA
- Technical articles 2004-03-31
- Use port knocking for a more secure method of opening ports
- Every open port on a firewall or a router is a security risk. That's why a technique called "port knocking" can be valuable. Port knocking is a method of allowing access to firewalled services given a preconfigured "knock." The knock consists of a sequence of access attempts to closed ports...
- Tags: security, sequence, server, Thomas Nooning CCNA, CCDA
- Technical articles 2004-03-03
- Configure IT Quick: Use rdesktop to administer Windows from Linux
- Use this tutorial to install and use rdesktop to allow a Linux system to access Windows Terminal Services.Working in a cross-platform data center is now the rule rather than the exception for the vast majority of administrators, as both Windows and Linux have made inroads into organizations around the world....
- Tags: Operating systems, UNIX, OPEN SOURCE, Terminal services, information technology, Thomas Nooning CCNA, CCDA, Rdesktop, Microsoft Windows, Linux, server, administrator
- Technical articles 2002-11-26
- Set up customized network monitoring with Perl
- While there are many full-featured network monitoring solutions available, from commercial software to open source packages, these programs don't always do exactly what you need them to do. Plus, with cost considerations and installation requirements, bigger is not always better when it comes to network monitoring packages. In certain circumstances,...
- Tags: Perl, Thomas Nooning CCNA, CCDA, network, network monitoring
- Technical articles 2004-02-03
- Set up ModSecurity on Apache for Web intrusion detection
- In the constant battle against malicious Web server activity you have an ally in the form of ModSecurity, an open source Apache module designed to provide intrusion detection and prevention of HTTP exploits. The module does this by filtering requests before they are handed off to the Web server or...
- Tags: Apache Software Foundation, Set-up ModSecurity, Thomas Nooning CCNA, CCDA, intrusion detection, Web
- Technical articles 2004-01-19
- Implement password security in Linux
- Get the lowdown on the basic steps you can take to secure passwords on Linux systems.The most basic aspect of securing information systems is password security. Unfortunately, this is often overlooked or not given the attention it deserves. Source IP addresses can be spoofed, physical access can be gained, social...
- Tags: Thomas Nooning CCNA, CCDA, Linux, password
- Technical articles 2002-10-21
- Track network connections with LSOF on Linux
- Use the LiSt Open Files LSOF utility to track data flow related to ports, users, and applications.LiSt Open Files LSOF is a Linux utility that allows you to view current network connections and the files associated with them. LSOF provides verbose output and is useful in tracking down all sorts...
- Tags: UNIX, OPEN SOURCE, Thomas Nooning CCNA, CCDA, Linux, network connection, LSOF
- Technical articles 2002-09-10
- Verify DNS records with Dlint on Linux
- Your DNS database is the lifeblood of your domain. But as hosts and Web servers change, it can easily become outdated and conflicted. Catch misconfigurations and fix them in a timely manner with the help of Dlint.If you manage Domain Name System DNS records, you probably already know how seemingly...
- Tags: Domain names, NETWORKING, Thomas Nooning CCNA, CCDA, Linux, Dlint, domain name, DNS
- Technical articles 2002-09-05
- Lock IT Down: Use Libsafe to secure Linux from buffer overflows
- See how you can use Libsafe to intercept calls to unsafe functions and processes in order to secure Linux against many buffer overflows.One of the more common types of attacks directed at Linux systems comes in the form of buffer overflows, which have accounted for more than 50 percent of...
- Tags: Viruses and worms, SECURITY, Thomas Nooning CCNA, CCDA, Linux, buffer-overflow, Libsafe
- Technical articles 2002-08-07
- Configure IT Quick: Use MRTG to monitor Linux routers and firewalls
- Install, configure, and use MRTG on Linux to monitor network systems and devices by using this tutorial as your guide.MRTG, or Multi Router Traffic Grapher, is a popular monitoring and statistics tool for use on Linux platforms. It was designed to monitor the traffic load on network links, but it's...
- Tags: Network administration, NETWORKING, Thomas Nooning CCNA, CCDA, Linux, firewall, information technology, router, monitor, SNMP, MRTG
- Technical articles 2002-08-01
- Lock down your system with Bastille Linux
- Use Bastille Linux to perform common security tasks that can quickly and easily lockdown a Linux system.Bastille Linux can help you tighten the security on your network. Originally designed to assist new Linux users unfamiliar with proper security procedures, Bastille has since become robust enough for administrators of any level....
- Tags: OPEN SOURCE, Thomas Nooning CCNA, CCDA, Bastille Linux, Mandrake
- Technical articles 2002-07-12
- Make easy work of monitoring Linux firewalls with firelogd
- Use firelogd to track Linux firewall logs and send e-mail summaries and alerts to administrators.Having a firewall is important for overall security, but it's equally important to regularly monitor its logs. Log monitoring helps you track possible access problems, provides data on the effectiveness of your rule sets, and documents...
- Tags: Firewalls, Network security, SECURITY, Thomas Nooning CCNA, CCDA, monitoring, firewall, firewall log, Linux firewall, Linux
- Technical articles 2002-05-30
- Get serious about monitoring hosts and services with Nagios
- Nagios, formerly known as NetSaint, is a comprehensive host and service monitoring tool that is distributed under the open source GPL license and runs on Linux/UNIX. Like Big Brother, Nagios has the ability to monitor and report on a wide variety of standard services. However, unlike its counterpart, Nagios provides...
- Tags: monitoring, Nagios, Thomas Nooning CCNA, CCDA
- Technical articles 2003-09-22
- Set up a Linux firewall with ease using Firestarter
- See how you can streamline the configuration of Linux firewalls by using the Firestarter tool.In a recent article, we looked at manually creating a firewall using iptables, the packet-filtering program built into the Linux 2.4 kernel. Now, we’re going to look at a front-end graphical user interface GUI you can...
- Tags: Firewalls, Network security, SECURITY, OPEN SOURCE, Linux, Thomas Nooning CCNA, CCDA, FireStarter, Installing Firestarter, firewall
- Technical articles 2002-04-26
- Utilizing the advanced firewall techniques in iptables
- The clear successor to the Linux firewall crown is iptables. See what features the netfilter/iptables package includes that can make your firewall more secure, provide better network performance, and improve logging.The netfilter/iptables firewall software for Linux includes advanced firewall features such as NAT, rate limiting, connection tracking, and packet mangling....
- Tags: Firewalls, NETWORKING, SECURITY, Thomas Nooning CCNA, CCDA, technique, Network Address Translation, firewall, SNAT, IP address, network
- Technical articles 2002-04-08
- Set up a strong Linux firewall with iptables
- Learn the basics to get started with manually coding iptables in Linux.In most organizations, network security has become interwoven with standard network and system administration. Threats in the form of malicious hackers, self-propagating worms, denial of service attacks, and other nefarious security problems loom large for administrators. Of course, one...
- Tags: Firewalls, Network security, SECURITY, Thomas Nooning CCNA, CCDA, firewall, kernel, Linux
- Technical articles 2002-04-02
