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详解vsftp服务器通过匿名用户、本地用户、虚拟用户三种登录方式实现文件传输-11895606

 5 years ago
source link: http://blog.51cto.com/11905606/2140599
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概述FTP(FileTransferProtocol)中文称为“文件传输协议”。用于Internet上的控制文件的双向传输。工作原理一、主动模式:客户端通过用户名和密码登录服务器端,登录的是21端口(服务器端主动开启的)。服务器端通过21端口接收到客户端的访问,验证用户名和密码。登陆成功,客户端会随机开启一个1024以上的端口,在端口上会传递一个叫port的命令,通过命令告知服务器,打开端口,向客

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