On top of this can be build more high level functions, for example, one that does traceroutes and give as a result only the start TTL of the request and the source IP of the answer. This has the big advantage over tools like Nmap or hping that an answer is not reduced to (open/closed/filtered), but is the whole packet. You define a set of packets, it sends them, receives answers, matches requests with answers and returns a list of packet couples (request, answer) and a list of unmatched packets. Scapy mainly does two things: sending packets and receiving answers. Scapy also performs very well on 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 encrypted channel, …), etc. It can replace hping, arpspoof, arp-sk, arping, p0f and even some parts of Nmap, tcpdump, and tshark. Scapy can easily handle most classical tasks like scanning, tracerouting, probing, unit tests, attacks or network discovery.

It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, match requests and replies, and much more. In other words, Scapy is a powerful interactive packet manipulation program.

This capability allows construction of tools that can probe, scan or attack networks. Scapy is a Python program that enables the user to send, sniff and dissect and forge network packets. Section author: Philippe Biondi About Scapy 

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