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[root@jcwkyl review]# tcpdump -vvv -t -X -s 1500 -w data host mail.jlu.edu.cn
tcpdump: listening on eth0, link-type EN10MB (Ethernet), capture size 1500 bytes
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tp > jcwkyl.gridlab.57415: P, cksum 0x9765
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2907544
165074058>
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