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FTP协议详解

2016-09-20 23:07:50   0  举报

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TCP/IP 卷一详解版

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27.1 Introduction

FTP is another commonly used application. It is Internet standard for file transfer.

27.2 FTP Protocol

FTP differs from the other applications that we've described because it uses two TCP connection to transfer a file

Date Representation

Numerous choices are provided in the FTP protocol specification to govern the way the file is transferred and stored. A choice must be made in each of four dimensions.

FTP Commands

The commands and replies send across the control connection between the client and server are in NVT ASCII .

FTP Replies

The repies are 3-digit numbers in ASCII, with an optional message following the number. The intent is that the software needs to look only at the number to determine how to process the reply , and the optional string is for human consumption.

Connection Management

There are three uses for the data connection

Sending a file from the client to the server

Sending a file from the server to the client

Sending a listing of files or directories from the server to the client.

27.3 FTP Examples

Connection Management: Ephemeral Data Port

Connection Management : Default Data Port

Text File Transfer: NVT ASCII Representation or Image?

Aborting A File Transfer: Telnet Synch Signal

Anonymous FTP

Anonymous FTP from an Unknown IP Address