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It enables you to build exactly the packets you want. For instance, do you know a tool that reports the Ethernet padding? But it is not complete, and you have a bias. The network’s vision they give you is the one their author thought was sufficient. Third, even programs which only decode do not give you all the information they received. And you often end up using tcpdump -xX to decode and interpret what the tool missed. It’s easier for beginners, but when you know what you’re doing, you keep on trying to deduce what really happened from the program’s interpretation to make your own, which is hard because you lost a big amount of information. For instance they say “ this port is open” instead of “ I received a SYN-ACK”. Some programs try to mimic this behavior. Interpretation is reserved for human beings.
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Machines are good at decoding and can help human beings with that.
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Second, they usually confuse decoding and interpreting. In fact, each time you have a new need, you have to build a new tool. Or try to find a program that can send, say, an ICMP packet with padding (I said padding, not payload, see?). For example, an ARP cache poisoning program won’t let you use double 802.1q encapsulation. These tools have been built for a specific goal and can’t deviate much from it. What makes Scapy so special įirst, with most other networking tools, you won’t build something the author did not imagine. One that does a portscan and returns a LaTeX report. One that pings a whole network and gives the list of machines answering. 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.
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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