嗅探器可以获取网络上流经的数据包。用集线器组建的网络是基于共享的原理的，局域网内所有的计算机都接收相同的数据包，而网卡构造了硬件的过滤器，通过识别MAC地址过滤掉和自己无关的信息，嗅探程序只需关闭这个过滤器，将网卡设置为混杂模式就可以进行嗅探。
浏览器嗅探功能是用于在浏览器网页上查找要下载的视频地址的一种功能，具体浏览器使用嗅探功能的操作步骤如下：1、首先我们打开ie浏览器，点击右上角的设置选项，再点击附加插件选项。
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2、打开面板后，点击服务，在搜索栏输入netvideohunter。
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3、然后我们点击搜索，出来一大堆插件，选择NetVideoHunterVideoDownloader插件安装。
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4、安装完成后，关闭浏览器重启即可。
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5、再次打开ie浏览器，右上角的资源嗅探功能已经打开了。
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6、点击资源嗅探功能，即可进去查看。
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