Plasmon Server ii 97707987 Rev A User Manual download pdf (Page 24)

18 97707987 Rev A

FTP

To configure FTP access to the SNAZ:

1 From the menu bar, select System - Services and click on FTP.

The FTP (Configuration) page opens:

2 If required, enter an FTP Server Banner. This is a message

which will be displayed to users when they access the SNAZ via

FTP.

3 Enter a Data Mode. The data mode can be:

• PORT - The client connects from a random unprivileged

port (N > 1024) to the FTP server's command port, port 21.

Then, the client starts listening to port N+1 and sends the

FTP command PORT N+1 to the FTP server. The server will

then connect back to the client's specified data port from

its local data port, which is port 20

• PASV - The client initiates both connections to the server,

solving the problem of firewalls filtering the incoming

data port connection to the client from the server. When

opening an FTP connection, the client opens two random

unprivileged ports locally (N > 1024 and N+1). The first port

contacts the server on port 21, but instead of then issuing a

PORT command and allowing the server to connect back to

its data port, the client will issue the PASV command. The

result of this is that the server then opens a random

unprivileged port (P > 1024) and sends the PORT P

command back to the client. The client then initiates the

connection from port N+1 to port P on the server to

transfer data

• BOTH - The FTP client defines the connection method

(PORT or PASV) and the server responds accordingly.

4 Enter a Connection Timeout. This defines how long the SNAZ

should remain connected, but idle, before disconnecting.

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Plasmon Server ii 97707987 Rev A User Manual Page 24