Mar 062012

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Here are some free, open-source, and useful network tools for Linux:

1) tcpdump is a common packet analyzer that runs under the command line. It allows the user to intercept and display TCP/IP and other packets being transmitted or received over a network to which the computer is attached. Distributed under the BSD license. The tcpdump command has a lot of advanced features, most of which revolve around filtering and finding a needle in a haystack of packets. If you run tcpdump on a remote machine, your screen will be flooded with all the ssh traffic between your client and the remote machine. To get started without having to learn too much about how tcpdump filtering works, run the following command:

sudo tcpdump | grep -v ssh
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Oct 072011

This is my small top 7 of the most read articles from Linuxaria in the month of September, it’s your opportunity to read them if you missed them during last month.

7 – Pipes: what are they and Example of Use

Unix based operating systems like Linux offer a unique approach to join two commands on the terminal, with it you can take the output of the first command and use it as input of the second command, this is the concept of pipe or | . Pipes allow two separate process to communicate with each other also if they were not created to do it, so this open an infinite series of opportunity.

A basic example is:

ls -l | grep rwxrwxrwx

This command will print the list of all the files in the local directory that have permission rwxrwxrwx (or that have rwxrwxrwx in their name).

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Sep 192011

Article by James Hawkins

This is the second part of our guide on Nmap, you can find the first part here, in this part of the tutorial we’ll see other configurations that you can use with Nmap to avoid firewalls or debug the information obtained.
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Understanding Nmap Commands: In depth Tutorial with examples

Article by James Hawkins As we all know, Nmap (Network Mapper) is a stealth port scanner widely used by network security experts (including forensics & Pen-testing Experts). In this article we’ll see the different types of Nmap Scans, its techniques, understanding the purpose and goals of each scan , its advantages or disadvantages over other [...]

3 network scanner for Linux

Sometime it’s useful to do an assessment of what’s online on your network, probably you think to know every server and service running, but I had more than one surprise in the past, with “test server just plugged in for a short time”, “New test service” or worst, hacked machine that exposed “new service”. Network [...]