FTP Configuration 431
■ Operating as an FTP server, the Switch 4210 cannot receive a file whose size
exceeds its storage space. The clients that attempt to upload such a file will be
disconnected with the FTP server due to lack of storage space on the FTP server.
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To protect unused sockets against attacks, the Switch 4210 provides the following
functions:
■ TCP 21 is enabled only when you start the FTP server.
■ TCP 21 is disabled when you shut down the FTP server.
Configuring connection idle time
After the idle time is configured, if the server does not receive service requests
from a client within a specified time period, it terminates the connection with the
client, thus preventing a user from occupying the connection for a long time
without performing any operation.
Configuring the banner for an FTP server
Displaying a banner: With a banner configured on the FTP server, when you access
the FTP server through FTP, the configured banner is displayed on the FTP client.
Banner falls into the following two types:
■ Login banner: After the connection between an FTP client and an FTP server is
established, the FTP server outputs the configured login banner to the FTP client
terminal.
Figure 146 Process of displaying a login banner
■ Shell banner: After the connection between an FTP client and an FTP server is
established and correct user name and password are provided, the FTP server
outputs the configured shell banner to the FTP client terminal.
Tab le 329 Configure connection idle time
Operation Command Description
Enter system view system-view -
Configure the connection idle
time for the FTP server
ftp timeout minutes Optional
30 minutes by default
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