passive-port-min
Sets the lowest port value for the passive port range.
Syntax
passive-port-min
port
Parameters
port
Specify the lower end of the passive port range. Use an integer in the
range of 1024 through 65534. The default is 1024.
Guidelines
The
passive-port-min
command sets the lowest port value for the passive port
range. This value must be less than the value set by the
passive-port-max
command.
This command is relevant when allowing or requiring the use of passive mode and
when limiting port usage to a specific range. In other words, this command is
relevant when both of the following conditions are met:
v
The value of the
passive
command is any keyword except
disallow
.
v
The value of the
passive-port-range
command is the keyword
on
.
Related Commands
passive
,
passive-port-max
,
passive-port-range
passive-port-range
Controls whether to limit the port range for passive connections.
Syntax
passive-port-range
{
on
|
off
}
Parameters
on
Enables the use of a limited port range.
off
(Default) Disables the use of a limited port range.
Guidelines
The
passive-port-range
controls whether to use a limited, TCP port range for
passive connections. This command is useful when a firewall or proxy server want
to allow incoming FTP data connections for a limited port range only. This
behavior is common with the FTP server that cannot use a packet analyzer
(sometimes known as a
packet sniffer
) on the control connection.
The range limits the maximum number of FTP clients that can be in the state
between when the FTP server issues a 227 (“Entering Passive Mode”) in response
to the
PASV
or
EPSV
command from the FTP client and when the FTP client must
establish a TCP data connection to the listening port and issue a data transfer
command. To control the pressure on this limited resource, use the
passive-idle-timeout
command to adjust the idle timeout value for passive data
connections.
306
Command Reference
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