Description:

Packit (Packet toolkit) is a network auditing tool. Its value is
derived from its ability to customize, inject, monitor, and manipulate
IP traffic. By allowing you to define (spoof) nearly all TCP, UDP,
ICMP, IP, ARP, RARP, and Ethernet header options, Packit can be useful
in testing firewalls, intrusion detection/prevention systems, port
scanning, simulating network traffic, and general TCP/IP auditing.
Packit is also an excellent tool for learning TCP/IP.