FTP服務器的工作模式有哪些

與大多數Internet服務一樣，FTP也是客戶機/服務器系統。用戶通過支持FTP協議的客戶機程式，連接到遠程主機上的FTP服務器程式。
FTP服務器的工作模式有哪些？
PORT：FTP客戶端首先與FTP服務器的TP21端口建立連接，通過通道發送命令，客戶端需要接收數據時在通道上發送PORT命令。
PASV：建立控制通道時與PORT相似，但建立連接後發送的不是PORT命令，而是PASV命令。FTP服務器收到PASV命令後，隨機打開一個高端端口，並通知客戶端在該端口上傳數據請求。
FTP服務器的優缺點
PORT FTP對FTP服務器管理有利，但對客戶端管理不利，因為FTP服務器企圖與客戶端的高位隨機端口建立連接，而該端口可能被客戶端防火墻阻擋。
PASVFTP對客戶端管理有利，對FTP服務器管理不利，因為客戶端要與服務器端建立兩個連接，其中一個連到高位隨機端口，該端口可能被服務器防火墻阻塞掉。
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What are the working modes of the FTP server?
PORT: The FTP client first establishes a connection with the TP21 port of the FTP server, and sends commands through the channel. When the client needs to receive data, it sends the PORT command on the channel.
PASV: It is similar to PORT when establishing a control channel, but after establishing a connection, it is not a PORT command, but a PASV command. After the FTP server receives the PASV command, it randomly opens a high-end port and notifies the client to upload data requests on this port.
Advantages and disadvantages of FTP server
PORT FTP is good for FTP server management, but not good for client management, because the FTP server attempts to establish a connection with the client's high random port, which may be blocked by the client firewall.
PASVFTP is good for client management but not good for FTP server management, because the client has to establish two connections with the server, one of which is connected to a high random port, which may be blocked by the server firewall.
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