IBM N Series Manual page 153

The ndmpd.data_port_range option allows administrators to specify a port
range on which the NDMP server can listen for data connections.
The start_port and end_port indicate the range of ports designated for
data connection and can have values between 1024 and 65535; start_port
must be less than or equal to end_port.
If a valid range is specified, NDMP uses a port within that range to listen
for incoming data connections. A listen request fails if no ports in the
specified range are free.
The default value for ndmpd.data_port_range option is all. The all
implies that any available port can be used to listen for data connections.
Note: The ndmpd.data_port_range option is persistent across reboots.
Example:
Filer1> options ndmpd.data_port_range 1024-2048
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