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Les Numériques - S'informer pour mieux acheter Ubuntu Genius's Blog Planet Libre 29 Practical Examples of NMAP Commands for Linux System/Network Administrators The Nmap aka Network Mapper is an open source and a very versatile tool for Linux system/network administrators. Nmap is used for exploring networks, perform security scans, network audit and finding open ports on remote machine. It scans for Live hosts, Operating systems, packet filters and open ports running on remote hosts. I’ll be covering most of NMAP usage in two different parts and this is the first part of nmap serious. 192.168.0.100 – server1.tecmint.com192.168.0.101 – server2.tecmint.com Nmap command usage # nmap [Scan Type(s)] [Options] {target specification} How to Install NMAP in Linux Most of the today’s Linux distributions like Red Hat, CentOS, Fedoro, Debian and Ubuntu have included Nmap in their default package management repositories called Yum and APT. # yum install nmap [on Red Hat based systems] $ sudo apt-get install nmap [on Debian based systems] Once you’ve install latest nmap application, you can follow the example instructions provided in this article. 1. 2. 4. 5.

Business et Technologies - ZDNet.fr Rappels utiles Linux Webynux | L'actualité du logiciel libre et des nouvelles technologies GnuPG Basics Explained with Linux GPG Command Examples GnuPG stands for GNU Privacy Guard. GnuPG is an open implementation of OpenPGP ( Pretty Good Privacy ) standard as defined in RFC 4880. In this article we will cover the installation and the basics of generating keys using gnupg. On Debian based systems, use the following command to install GnuPg tool. # apt-get install gnupg The first step to use GnuPg is to create the public and private key pairs. $ gpg --gen-key The above command will act in Interactive mode. 1. gpg: directory `/home/lakshmanan/.gnupg' created gpg: new configuration file `/home/lakshmanan/.gnupg/gpg.conf' created gpg: WARNING: options in `/home/lakshmanan/.gnupg/gpg.conf' are not yet active during this run gpg: keyring `/home/lakshmanan/.gnupg/secring.gpg' created gpg: keyring `/home/lakshmanan/.gnupg/pubring.gpg' created Please select what kind of key you want: (1) RSA and RSA (default) (2) DSA and Elgamal (3) DSA (sign only) (4) RSA (sign only) Your selection? Each algorithm has its own advantages and disadvantages.