These monitors have special parameters user Name and Password which are used to connect to FTP servers that need authentication) The FTP monitor checks basic functionality the FTP-EXTENDED monitor also verifies that the FTP server is able to transmit a file correctly. (The NetScaler appliance has two built-in monitors for FTP services: the FTP monitor and the FTP-EXTENDED monitor. Note: NetScaler supports both active FTP and passive FTP which is decided on the runtime, so there is no specific configuration to be done for active FTP/passive FTP. Because the client always initiates the required connections. Passive FTP should be viewed as the server never making an active attempt to connect to the client for FTP data transfers. The source port of data transfer connection is always a high port on the client with a destination port of a high port on the server.
Whenever the client requests data over the control connection, the client initiates the data transfer connections to the server.
Client connects to the FTP server by establishing an FTP control connection to port 21 of the server. The source port of data transfer connection is always port 20 on the server, and the destination port is a high port (greater than 1024) on the client.įor passive FTP, the connection is initiated from the FTP client.
Whenever the client requests data over the control connection, the server initiates data transfer connection back to the client. Client connects to the FTP server by establishing FTP control connection to port 21 of the server. In active FTP, the FTP server initiates a data transfer connection back to the client. Multiple data types (ASCI, EBCDIC, image and local) and file types are supported to allow flexibility for various types of transfers. FTP supports either active or passive data connections, allowing either the server or client to initiate the data connection. Second a data connection is established for each individual data transfer to be performed. An FTP session is composed of two flows, first an FTP control connection is created to pass FTP commands (such as GET, PUT, etc) back and forth between the client and server. It is based on a client/server model with an FTP client on a user machine initiating a connection to a FTP server to send and retrieve files to and from the server. File transfer protocol is a standard for the exchange of files across a network.
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