Data ONTAP supports a designated range of TCP/IP ports that can be used for NDMP data connections in response to NDMP_DATA_LISTEN and NDMP_MOVER_LISTEN operations.
Starting with Data ONTAP 8.0.1, administrators can designate range of ports that can be used for NDMP data connections in response to NDMP_DATA_LISTEN and NDMP_MOVER_LISTEN operations. Therefore, Data ONTAP enables you to perform data migration by using ndmpcopy command and 3-way tape backups even in environments where the source and destination networks are separated by a firewall.
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.
Filer1> options ndmpd.data_port_range 1024-2048