Ping! Are you there?
summary
Explains how ping builds ICMP packets over a raw socket, puts the process ID in the identifier, increments a sequence number and includes a timestamp so each received echo reply yields a measured round trip time; shows output lines as individual ICMP replies and that RTT equals now minus timestamp; demonstrates a smurf attack where spoofing the victim as the source and sending to a network broadcast amplifies traffic by the number of hosts and floods the target.
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chapters (15)
- 0:00Intro
- 1:02The origins of Ping
- 1:58The internet is complicated
- 2:21The networking stack
- 2:34Data link layer
- 2:54Network layer
- 3:27Transport layer
- 3:46Data layer
- 3:57Header layer
- 4:38Sockets
- 5:22ICMP
- 6:28Output
- 6:55Security problems
- 7:08DDoS
- 7:51Amplifier Network
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