Information, Computer and Network Security Terms Glossary and
Nemesis is a packet generation and crafting tool, which can be used by attackers to forge packets for the purpose of compromise, crash or fool systems or network equipment. They are nemesis-arp, nemesis-dns, nemesis-icmp, nemesis-igmp, nemesis-ospf, nemesis-rip, nemesis-tcp, and nemesis-udp. Each is designed to construct and send a particular type of packet. The inclusion of support for protocols like OSPF or IGMP really sets nemesis apart from similar tools.