在Linux命令行中使用tcpdump抓包

正如示例中所示，保存数据包到文件中时屏幕上就没有任何有关数据报文的输出，其中 -c10 表示抓取到 10 个数据包后就停止抓包。如果想有一些反馈来提示确实抓取到了数据包，可以使用 -v 选项。

tcpdump 将数据包保存在二进制文件中，所以不能简单的用文本编辑器去打开它。使用 -r 选项参数来阅读该文件中的报文内容：

$ tcpdump -nn -r webserver.pcap
reading from file webserver.pcap, link-type LINUX_SLL (Linux cooked)
13:36:57.679494 IP 192.168.122.98.39378 > 54.204.39.132.80: Flags [S], seq 3709732619, win 29200, options [mss 1460,sackOK,TS val 135708029 ecr 0,nop,wscale 7], length 0
13:36:57.718932 IP 54.204.39.132.80 > 192.168.122.98.39378: Flags [S.], seq 1999298316, ack 3709732620, win 28960, options [mss 1460,sackOK,TS val 526052949 ecr 135708029,nop,wscale 9], length 0
13:36:57.719005 IP 192.168.122.98.39378 > 54.204.39.132.80: Flags [.], ack 1, win 229, options [nop,nop,TS val 135708068 ecr 526052949], length 0
13:36:57.719186 IP 192.168.122.98.39378 > 54.204.39.132.80: Flags [P.], seq 1:113, ack 1, win 229, options [nop,nop,TS val 135708068 ecr 526052949], length 112: HTTP: GET / HTTP/1.1
13:36:57.756979 IP 54.204.39.132.80 > 192.168.122.98.39378: Flags [.], ack 113, win 57, options [nop,nop,TS val 526052959 ecr 135708068], length 0
13:36:57.760122 IP 54.204.39.132.80 > 192.168.122.98.39378: Flags [P.], seq 1:643, ack 113, win 57, options [nop,nop,TS val 526052959 ecr 135708068], length 642: HTTP: HTTP/1.1 302 Found
13:36:57.760182 IP 192.168.122.98.39378 > 54.204.39.132.80: Flags [.], ack 643, win 239, options [nop,nop,TS val 135708109 ecr 526052959], length 0
13:36:57.977602 IP 192.168.122.98.39378 > 54.204.39.132.80: Flags [F.], seq 113, ack 643, win 239, options [nop,nop,TS val 135708327 ecr 526052959], length 0
13:36:58.022089 IP 54.204.39.132.80 > 192.168.122.98.39378: Flags [F.], seq 643, ack 114, win 57, options [nop,nop,TS val 526053025 ecr 135708327], length 0
13:36:58.022132 IP 192.168.122.98.39378 > 54.204.39.132.80: Flags [.], ack 644, win 239, options [nop,nop,TS val 135708371 ecr 526053025], length 0
$

这里不需要管理员权限 sudo 了，因为此刻并不是在网络接口处抓包。

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