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.

Download NEMESIS

Linux Source code : nemesis-1.4.tar.gz (Build 26)

Windows binary : nemesis-1.4.zip (Build 26)

Other Requirements

Unix-like systems require

libnet-1.0.2a, and a C compiler (GCC)

Windows systems require

libnetNT-1.0.2g and either WinPcap-2.3 or WinPcap-3.0

Supported Platforms

*BSD, Linux, Solaris, Mac OS X, Microsoft Windows

Official Site : http://nemesis.sourceforge.net