Nemesis – Packet Injection Suite

Keep on Guard!


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 packets for:

  • ARP
  • DNS
  • ETHERNET
  • ICMP
  • IGMP
  • IP
  • OSPF
  • RIP
  • TCP
  • UDP

Using the IP and the Ethernet injection modes, almost any custom packet can be crafted and injected.

Unix-like systems require: libnet-1.0.2a, and a C compiler (GCC)
Windows systems require: libnetNT-1.0.2g and WinPcap

Download it here:

Source code: nemesis-1.4.tar.gz (Build 26)
Windows binary: nemesis-1.4.zip (Build 26) (includes LibnetNT)

You can read more here:

Nemisis at Sourceforge

Posted in: Hacking Tools, Linux Hacking, Networking Hacking, Windows Hacking

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3 Responses to Nemesis – Packet Injection Suite

  1. yzan June 3, 2007 at 11:01 am #

    In the title and tags should be Nemesis rather than Nemisis.

  2. Darknet June 3, 2007 at 6:19 pm #

    yzan: Thanks for the correction!

  3. Hanashi June 3, 2007 at 6:59 pm #

    I’ve used Nemesis in the past, while teaching an IDS class. It’s a pretty good tool for creating arbitrary packets. I usually set up whatever header and payload the students need to detect, then just run it in a shell loop so it sends the same packets over and over. Works like a charm, and it’s pretty simple to get going.