Nmap (“Network Mapper”) is an open source tool for network scanning and security auditing. This intro gives you some basic and interesting Nmap usages with examples on a GNU/Linux system.

The new release of Nmap (free software network port scanner) is here. A primary focus of this release is the Nmap Scripting Engine, which has allowed Nmap to expand up the protocol stack and take network discovery to the next level.

Nmap, or the Network Mapper, is a powerful command-line tool for diagnosing network problems, finding security vulnerabilities, and host of other uses. Its many options and scanning methods can be daunting to even the most experienced of end users, but nmapFE is a graphical interface for nmap that makes it easy to use even the most powerful aspects of the network mapper, and can be a life-saver when you run into networking problems.

nmap has -D option. It is called decoy scan. With -D option it appear to the remote host that the host(s) you specify as decoys are scanning the target network too. Thus their IDS might report 5-10 port scans from unique IP addresses, but they won’t know which IP was scanning them and which were innocent decoys.

Use nmap to discover network elements and to scan ports on those network elements, learn here how to install nmap GUI front ends, and how to use them.

Zenmap is the official graphical user interface (GUI) for the Nmap Security Scanner. It is a multi-platform, free and open-source application designed to make Nmap easy for beginners to use while providing advanced features for experienced Nmap users. The purpose of Zenmap is not to replace Nmap.

Remote OS Fingerprinting is becoming more and more important, not only for security pen-testers,but for the black-hat. Just because Nmap is getting popularity as the tool for guessing which OS is running in a remote system, some security tools have been developed to fake Nmap in its OS Fingerprinting purpose.

In a surprise this morning, Fyodor announces the immediate availability of Nmap v5.00

One of the most frustrating problems a network administrator can come across is an IP address conflict, when two or more machines on a network try to use the same IP. It's frustrating because it's a difficult problem to detect and resolve -- unless you know the right tools.