"TCP port" tag
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…

The cop's patrolling

Guard Your Network with IPCop, Part 1: Installation Basics

The classic version of IPCop 1.4.20, which was released on July 24, 2008, was immediately upgraded to the 1.4.21 ISO installer. The much awaited version 2.0 has been out since September 23, 2011….

Oops, am under attack, again!

Cyber Attacks Explained: DoS and DDoS

With this article, we begin a new series on the major kinds of cyber attacks that weaken the IT security infrastructure within organisations. With the rapid spread of Internet technologies and applications, 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…

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…

Nmap Scanning Techniques

Advanced Nmap: Scanning Techniques Continued

The earlier articles on Nmap had covered the basic features, the working of the TCP 3-way handshake, and some important scan types, along with their practical use. The third article in this series…

Advanced Nmap

Advanced NMap: Some Scan Types

A broad overview and the basic features of NMap have been covered in an earlier article in this series of articles on Nmap. In this article, we discuss in detail various NMap scan…

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