NDMPPORTRANGE
The NDMPPORTRANGE option specifies the range of port numbers through which IBM® Storage Protect cycles to obtain a port number for accepting a session from a network-attached storage (NAS) device for data transfer. The default is 0,0 which means that IBM Storage Protect lets the operating system provide a port (ephemeral port).
If all ports specified are in use when a NAS device attempts to connect to the server, the operation fails. If a single port number is chosen (no comma and no port number for the high value), the default for the high port number is the low port number plus 100.
When Network Data Management Protocol (NDMP) data is directed to an IBM Storage Protect native pool, communication can be initiated from either the NDMP systems or the IBM Storage Protect server. If a firewall separates the server and NAS devices, it may be necessary to specify port numbers in firewall rules to allow traffic to pass to and from the NAS devices. NAS devices communicate to the IBM Storage Protect server the port numbers that they will use when contacting the server. The port numbers of the server are controlled with the NDMPPortrange options. Port number control for NAS devices is specific to vendors. Consult your vendor documentation.
Syntax
Parameters
- port_number_low
- The low port number from which IBM Storage Protect starts to cycle when needing a port number for accepting session from a NAS device for data transfer. The minimum port number value is 1024.
- port_number_high
- The high port number to which IBM Storage Protect can cycle when needing a port number for accepting session from a NAS device for data transfer. The maximum port number value is 32767. The high port number must be the same or larger than the low port number.
Examples
Specify that IBM Storage Protect can cycle from port numbers 1024 - 2024.
ndmpportrange 1024,2024