Linux--使用tcpdump抓包

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Ubuntu16系统里面的tcpdump帮助信息的输出如下：

root@ubuntu:/home/fl# tcpdump --help
tcpdump version 4.9.2
libpcap version 1.7.4
OpenSSL 1.0.2g  1 Mar 2016
Usage: tcpdump [-aAbdDefhHIJKlLnNOpqStuUvxX#] [ -B size ] [ -c count ]
        [ -C file_size ] [ -E algo:secret ] [ -F file ] [ -G seconds ]
        [ -i interface ] [ -j tstamptype ] [ -M secret ] [ --number ]
        [ -Q in|out|inout ]
        [ -r file ] [ -s snaplen ] [ --time-stamp-precision precision ]
        [ --immediate-mode ] [ -T type ] [ --version ] [ -V file ]
        [ -w file ] [ -W filecount ] [ -y datalinktype ] [ -z postrotate-command ]
        [ -Z user ] [ expression ]

1.抓取经过eth0，目的或源地址是192.168.1.1的网络数据

tcpdump -i eth0 host 192.168.1.1

2.抓取经过eth0，源地址是192.168.1.1的网络数据

tcpdump -i eth0 src host 192.168.1.1

3.抓取经过eth0，目的地址是192.168.1.1的网络数据，并把数据写入到test.cap文件

tcpdump -i eth0 -w test.cap dst host 192.168.1.1