Mar 062012
 

Article by http://itechmasters.blogspot.com

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
Continue reading »

flattr this!

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.
Continue reading »

flattr this!

Sep 162011
 

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 scanning tools, which could be better at evading firewalls & IDS (To a certain extent) and much more. In this first part, I have made my best to explain the basic scanning techniques, Host discovery options, port scanning options, techniques used in detecting Operating system & services running on the system.
i also give Nmap as already installed on your system.
Continue reading »

flattr this!