Network injection, also known as packet injection or packet crafting, is a technique used in computer networking and security to send specially crafted packets into a network with the goal of performing various actions, such as testing network performance or security, manipulating network traffic, or exploiting network vulnerabilities.

The technique involves creating custom packets with specific values for various fields, such as the source and destination IP addresses, port numbers, and packet contents. These packets are then sent into the network to simulate different types of network traffic or attacks.

Network injection can be used for both defensive and offensive purposes. It can be used to test network security by simulating attacks and vulnerabilities, and to test network performance by simulating different types of traffic. However, it can also be used for malicious purposes, such as to launch denial-of-service (DoS) attacks, intercept sensitive information, or modify network traffic.

It is important to note that network injection can be illegal if used for malicious purposes, and should only be performed by authorized individuals who have obtained proper permissions and legal clearance.

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