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+====== tcpdump ======
+Today I check my Gmail, and found a email from Digital Ocean, warned me that the server owned by me was attacking another server.
+So I want to find out what the problem is, and the tools I used is
+  - tcpdump
+  - netstat
+  - wireshark
+<code>
+tcpdump -i eth0 -vvv -X   host   58.33.155.218
+tcpdump -i eth0 -vvv -X not  host   58.33.155.218
+</code>
+  netstat -anp
+<code>
+tcpdump tcp -i eth1 -t -s 0 -c 100 and dst port ! 22 and src net 192.168.1.0/24 -w ./target.cap
+(1)tcp: ip icmp arp rarp 和 tcp、udp、icmp这些选项等都要放到第一个参数的位置，用来过滤数据报的类型
+(2)-i eth1 : 只抓经过接口eth1的包
+(3)-t : 不显示时间戳
+(4)-s 0 : 抓取数据包时默认抓取长度为68字节。加上-S 0 后可以抓到完整的数据包
+(5)-c 100 : 只抓取100个数据包
+(6)dst port ! 22 : 不抓取目标端口是22的数据包
+(7)src net 192.168.1.0/24 : 数据包的源网络地址为192.168.1.0/24
+(8)-w ./target.cap : 保存成cap文件，方便用ethereal(即wireshark)分析
+</code>