Packet traffic on the network

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A long time ago, I had knowledge of a technique that basically all the data that is sent or received by the router, is "duplicated" and forwarded to a specific address and the obvious original sender/recipient.
Obviously this causes an overload at that specific address and this is used by malicious p/access data but also purposely to check the integrity of the packets.
My question is: What is the name of this "technique"?

networks
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    Broadcast, that would be it?

  • I don’t know much about nets but what I was looking for is called Sniffer

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    Sniffer is verifying all packets that are passing on the network including those that are not intended for you. Broadcast is when vc sends one or more packages to all hosts on the network.

  • If it’s a switch you can achieve this by doing "Port mirroring", where all traffic is routed to a specific port where you have a sniffing device.

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Perhaps the "man-in-the-Middle" technique is what you are looking for, since there is a "Sniffer pivot" between the sender and the recipient of the package, where this "pivot" is responsible for receiving the sent package, doing whatever it takes and sending it to the destination. If you need more information, you can read here: https://www.owasp.org/index.php/Man-in-the-middle_attack

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