说明:tcp dump for android
./tcpdump -xx host 10.21.49.38 //打印本地IP发出和收到的所有包,并显示各层
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 262144 bytes
14:18:26.648709 ARP
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