2.tcpdump(1)

tcpdump - 显示网络负载

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用法概览

tcpdump [ -AdDeflLnNOpqRStuUvxX ] [ -c count ]
[ -C file_size ] [ -F file ]
[ -i interface ] [ -m module ] [ -M secret ]
[ -r file ] [ -s snaplen ] [ -T type ] [ -w file ]
[ -W filecount ]
[ -E spi@ipaddr algo:secret,... ]
[ -y datalinktype ] [ -Z user ]
[ expression ]

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选项

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条件表达式

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http://sanyk.is-programmer.com/posts/14645.html