"MAC addresses" tag
Blocking outgoing traffic

Guard Your Network with IPCop, Part 3: Block Outgoing Traffic

The first article in the series discussed IPCop 1.4.21, its basic installation and configuration. Though an excellent firewall distro, basic IPCop has limited functionality. To enhance it, various add-ons are available. We covered…

Yet another kind of cyber attack, eh?

Cyber Attacks Explained: DNS Invasions

We often read about defaced websites whose pages get changed to some malicious content. How do hackers do it and how do we protect our infrastructure from them? This article is about how…

Securing Database Servers

Securing Database Servers

With the ever-expanding data requirements for Web applications, database administrators often configure security parameters at the OS and database layer. Unfortunately, administrators seldom consider implementing security at a network layer to protect the…

Verify firewall security

Advanced Nmap: Scanning Firewalls Continued

The previous article detailed methods to scan an IPCop-based firewall in a test environment. The scan output revealed several open ports, which could lead to various vulnerabilities. Based on the scan results, several…

Introducing libpcap

Capturing Packets in Your C Program, with libpcap

This article provides an introduction to libpcap, and shows, with examples of source code, how you can use it to create your own packet-sniffing programs. All data on the network travels in the…

Firewall Scan

Advanced Nmap: Scanning Firewalls

After four articles on Nmap [1, 2, 3 & 4], which explained a number of command-line options for scan technique specification, target specification, port specifications, host discovery, evasion techniques, etc, it is time…

Scan time!

Advanced Nmap: FIN Scan & OS Detection

Nmap is a fantastic tool, and I just can’t refrain from praising it, every time I use it. The earlier articles in this series have detailed many important Nmap scan types. Let us…

Wi-Fi penetration testing

Aircrack-ng: Wi-Fi Troubleshooting, Auditing and Cracking Made Easy

Wi-Fi technology has today become almost ubiquitous for wireless local area networks at offices, restaurants, homes, airports, hotels, etc. However, with increased Wi-Fi usage and awareness, hackers (or, rather, crackers) are exploiting the…

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