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Traffic Sniffing, FTP Bounce and Smurf This lesson covers packet sniffing, FTP bounce and Smurf. Packing sniffing involves capturing network traffic. A way to mitigate packet sniffing is to secure WiFi, eliminate hubs and encrypt traffic. File transfer protocol bounce connects to FTP server with port to specify port on another client. FTP bounce sends data to open port on specific client. Smurf sends a forged ICMP packet into the network specifying broadcast recipient. Smurf attacks have mostly been eliminated by advancements in routers and how we respond to ICMP echo requests.