Administration and Security Using nmap

From “Using nmap for Linux administration and security” at http://searchenterpriselinux.techtarget.com/tip/Using-nmap-for-Linux-administration-and-security

nmap “Network Mapper” is a free and open source utility for network exploration or security auditing.

Ping scan to inventory network

nmap -sP -n 192.168.1.0/24

What changed since the last inventory scan?

diff monday.scan tuesday.scan | grep “> Host”

Host-specific inventory

nmap -n -sV 192.168.1.5

Who has ports 80 or 443 open on the network?

nmap -n -p 80,443 192.168.1.0/24 | egrep “ports|open”

What is the state of port 139 on the network?

nmap -n -sV -p 139 192.168.1.0/24 | egrep “ports|139”

Run and test nmap

nmap –A –T4 scanme.insecure.org

Articles about nmap from searchsecurity.techtarget.com:

Introduction

Video demo: How to use nmap to scan a network

Nmap: A valuable open source tool for network security

How to install and configure Nmap for Windows

How to install and configure Nmap on Linux

How to scan ports and services

More port scanning techniques

Firewall configuration testing

Techniques for improving Nmap scan times

Interpreting and acting on Nmap scan results

Nmap parsers and interfaces

Nmap and the open source debate

Nmap tutorial: How to use the open source network scanner

Detecting irregular programs and services installed in your network

Testing for opened ports with firewalk technique