Forging packets or spoofing packets are common ways of describing packet injection. Packet injection is one way hackers try to disrupt or intercept packets from already established network connections. The way they do this is by injecting their own packets into the data stream. The packets injected by the hacker will appear as normal packets. This causes malicious activity to be overlooked and ignored. Packet injection is used mostly in denial-of-service (DoS) and man-in-the-middle attacks.
