Monday 30 April 2018

Nemesis: A Command-line Network Packet Crafting And Injection Utility

A Command-line Network Packet Crafting And Injection Utility

A Command-line Network Packet Crafting And Injection Utility

The Nemesis Project is designed to be a command line based, portable human IP stack for UNIX-like and Windows systems. 

The suite is broken down by protocol, and should allow for useful scripting of injected packets from simple shell scripts.

Key Features

  • ARP/RARP, DNS, ETHERNET, ICMP, IGMP, IP, OSPF, RIP, TCP and UDP protocol support
  • Layer 2 or Layer 3 injection on UNIX-like systems
  • Layer 2 injection (only) on Windows systems
  • Packet payload from file
  • IP and TCP options from file
  • Tested on OpenBSD, Linux, Solaris, Mac OS X and Windows 2000

Each supported protocol uses its own protocol "injector" which is accompanied by a man page explaining its functionality.

Consult the ChangeLog for release details, and the documentation for each protocol injector for in-depth descriptions of the available functionality.


  • Inject malformed ICMP redirect

sudo nemesis icmp -S -D -G -i 5

  • IGMP v2 join for group

sudo nemesis igmp -v -p 22 -S -i -D

  • IGMP v2 query, max resp. time 10 sec, with Router Alert IP option

 echo -ne '\x94\x04\x00\x00' >RA
sudo nemesis igmp -v -p 0x11 -c 100 -D -O RA


echo -ne '\x94\x04\x00\x00' | sudo nemesis igmp -v -p 0x11 -c 100 -D -O -

  • IGMP v3 query, with Router Alert IP option

  echo -ne '\x03\x64\x00\x00' > v3
  sudo nemesis igmp -p 0x11 -c 100 -i -P v3 -D -O RA

  • Random TCP packet

  sudo nemesis tcp

  • DoS and DDoS testing
  sudo nemesis tcp -v -S -D -fSA -y 22 -P foo
  sudo nemesis udp -v -S -D -x 11111 -y 53 -P bindpkt
  sudo nemesis icmp redirect -S -D -G -qR
  sudo nemesis arp -v -d ne0 -H 0:1:2:3:4:5 -S -D

Build & Install

Nemesis is built around libnet. Windows platform builds require libpcap as well. On Debian and Ubuntu derived GNU/Linux systems:

sudo apt install libnet1-dev

The GNU Configure & Build system use /usr/local as the default install prefix. Usually this is sufficient, the below example installs to /usr instead:

tar xf nemesis-1.5.tar.xz
cd nemesis-1.5/
./configure --prefix=/usr
make -j5
sudo make install-strip

Building from GIT

If you want to contribute, or simply want to try out the latest but still unreleased features, then you need to know a few things about the GNU Configure & Build system:

  • and a per-directory are key files
  • configure and are generated from, they are not stored in GIT but automatically generated for the release tarballs
  • Makefile is generated by configure script

To build from GIT you first need to clone the repository and run the script. This requires automake and autoconf to be installed on your system.

git clone
cd inadyn/
./configure && make

GIT sources are a moving target and are not recommended for production systems, unless you know what you are doing!



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