问一个ftp的问题,大虾请帮帮小虾米的忙啊~~

[isaxu]

FILE TRANSFER FUNCTIONS

The communication channel from the user-PI to the server-PI is
established as a TCP connection from the user to the standard server
port. The user protocol interpreter is responsible for sending FTP
commands and interpreting the replies received; the server-PI
interprets commands, sends replies and directs its DTP to set up the
data connection and transfer the data.

If the second party to the
****what's "the second party"?******
data transfer (the passive transfer process) is the user-DTP, then it
is governed through the internal protocol of the user-FTP host; if it
is a second server-DTP,
*******what's the meaning of "a second server-DTP"********
then it is governed by its PI on command from
the user-PI.

*****第二段是什么意思呢？********

[imquestion]

看情况是，second party 指数据传输的那个tcp连接。

[roan]

具体的原文，我忘了，根据理解：由于ftp协议中，实际上有两个tcp连接，一个用来传输命令，一个用来传输数据。一次对于client或server端，实际上都有两个进程（first,second)，first party用于传输命令，second party 用于传输数据。