例として www.example.com への HTTP GET のパケットキャプチャをやってみる。 $ sudo tcpdump host www.example.com and port 80 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on en0, link-type EN10MB (Ethernet), capture size 65535 bytes 09:36:20.760358 IP 10.0.1.23.65428 > 93.184.216.119.http: Flags [S], seq 2250708012, win 65535, options [mss 1460,nop,wscale 4,nop,nop,TS val 938288017 ec
![tcpdump の見方を勉強](https://cdn-ak-scissors.b.st-hatena.com/image/square/87bb59df23f4ab97a94294d3a89d9daa76699003/height=288;version=1;width=512/https%3A%2F%2Fplease-sleep.cou929.nu%2Fimages%2Fkosei-pic.png)