net/scapy - The NetBSD Packages Collection

Scapy is a powerful Python-based interactive packet manipulation program
and library. It is able to forge or decode packets of a wide number of
protocols, send them on the wire, capture them, store or read them using
pcap files, match requests and replies, and much more. It is designed to
allow fast packet prototyping by using default values that work.

It can easily handle most classical tasks like scanning, tracerouting,
probing, unit tests, attacks or network discovery (it can replace hping,
85% of nmap, arpspoof, arp-sk, arping, tcpdump, wireshark, p0f, etc.).
It also performs very well at a lot of other specific tasks that most
other tools can't handle, like sending invalid frames, injecting your
own 802.11 frames, combining techniques (VLAN hopping+ARP cache
poisoning, VoIP decoding on WEP protected channel, ...), etc.

Scapy supports Python 2.7 and Python 3 (3.4 to 3.10). It's intended to be
cross platform, and runs on many different platforms (Linux, OSX, *BSD,
and Windows).