计算机网络怎么学？学会这几个工具有助你理解网络协议！

{"type":"doc","content":[{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"在实际开发过程中，熟悉使用Linux或者Windows中相关网络工具，可以让我更快更准的找到故障，所以今天分享几个必回的网络利器"}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"1 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表示ICMP的类型，如果为0表示请求类型，为8表示应答"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"代码：用来查找产生错误的原因"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"校验和：检查错误的数据"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"标识符:使用标识符确认到底是谁发送的控制协议"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"序列号：唯一确定的一个报文"}]}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"ping命令组装成上述的IP报文进行发送，报文目的地之为ping目的地址，原地址为发送ping主机地址，然后按照ICMP的规则填写数据。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"随后IP报文通过ARP协议，知道"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"查看详细参数"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/92/9296418ffde09d63c3abf5fe98d67a6c.png","alt":"ping参数","title":null,"style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"常用参数"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"[-l] 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main():\n parser = optparse.OptionParser('[*] Usage : ./pcapTest.py -f ')#测试包\n parser.add_option('-f',dest='fileName',type='string',help='specify target filename')\n (options,args) = parser.parse_args()\n fileName = options.fileName# 取得包名\n \n if fileName == None:\n print parser.usage\n exit(0)\n else:\n #f = open('geotest.pcap')\n f = open(fileName)\n pcap = dpkt.pcap.Reader(f)\n printPcap(pcap)\n \nif __name__ == '__main__':\n main()"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"9 scapy"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"注意哈，这个是嗅探包不是爬虫框架scrapy哈。看看官网怎么说的，如“强大的交互式包操作工具”、“支持大量协议的包解析和包构造”、“轻松取代 hping，85% 的 nmap，arpspoof，tcpdump 等等”。不过归根到底，它说的强大功能，都是基于 Scapy 是一个强大的网络数据包操作工具才能实现得了的。只是大概介绍，具体用法官网非常详细，有助于学习网络协议"}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"有收获？希望老铁们来个三连击，给更多的人看到这篇文章"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"给俺点个赞呗，可以让更多的人看到这篇文章，顺便激励下我，嘻嘻。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":""}]},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/0c/0c6a27b8b1e87740be2ebb404e2a0908.png","alt":null,"title":"","style":[{"key":"width","value":"50%"},{"key":"bordertype","value":"none"}],"href":"","fromPaste":false,"pastePass":false}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}}]}