Category: Network Hacks


Nemesis is a command-line network packet crafting and injection utility for UNIX-like and Windows systems. Nemesis, is well suited for testing Network Intrusion Detection Systems, firewalls, IP stacks and a variety of other tasks. As a command-line driven utility, Nemesis is perfect for automation and scripting.

Nemesis can natively craft and inject ARP, DNS, ETHERNET, ICMP, IGMP, IP, OSPF, RIP, TCP and UDP packets. Using the IP and the Ethernet injection modes, almost any custom packet can be crafted and injected.

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It’s been known for a while that WEP is easily cracked. Today I will show you just how easy it is and how to test your network’s security yourself. Since I usually find that there’s generally too much explanation involved in these tutorials, I will try to keep it simple.

You Will Require :

A Wireless Router with WEP encryption
A Wireless Card Capable of Injection ( Atheros Cards are Preferred)
A Copy of BackTrack Linux
A USB Drive (2GB or larger)

Steps To Follow :

First, you need BackTrack on a USB drive. Plug your USB drive into your computer and format it with FAT32.

Nmap Hacking Theory

Following are the states that ports are available in

1. Open                                 Closed

2. Filtered                            Unfiltered

3.  Open / filtered               Closed/Unfiltered

Scanning through Nmap gives you list of ports that are opened or filtered. Most of closed ports are not disclosed as there are almost 65000 ports in a computer for communication.

(Filtered packet : It means the data packets that are sent or received are filtered by firewall to secure it.)