About the Port Ranges properties

Article:HOWTO14632  |  Created: 2008-01-11  |  Updated: 2008-01-15  |  Article URL http://www.symantec.com/docs/HOWTO14632
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About the Port Ranges properties

NetBackup communicates between computers by using a combination of registered and dynamically allocated ports. Use the Port Ranges properties to determine how hosts connect to one another. The Port Ranges properties apply to selected master servers, media servers, and clients.

The following items describe the different types of ports:

  • Registered ports are registered with the Internet Assigned Numbers Authority (IANA) and are permanently assigned to specific NetBackup services. For example, the port for the NetBackup client service (bpcd) is 13782. These ports are specified in a system configuration file:

    %systemroot%\system32\drivers\etc\services

    Media Manager services include tape library control daemons, which accept connections from daemons on other servers that share the same library. See the services file on the media server to determine the ports that are required for a specific library.

  • Dynamically-allocated ports are assigned as needed, from configurable ranges in the Port Ranges host properties for NetBackup servers and clients.

    In addition to the range of numbers, you can configure the following for dynamically-allocated ports:

    • Whether NetBackup selects a port number at random or starts at the top of the range and uses the first one available.

    • Whether connections to bpcd on a client use reserved or non-reserved ports.

Figure: Port Ranges dialog box

Port Ranges dialog box

The Port Ranges dialog box contains the following options:

Use random port assignments

This property specifies how NetBackup communicates with NetBackup on other computers. This property specifies that NetBackup randomly chooses a port from those that are free in the allowed range. For example, if the range is from 1023 through 5000, it chooses randomly from the numbers in this range.

By default, Use random port assignments is selected, and ports are randomly chosen.

If this property is not selected, NetBackup chooses numbers sequentially. NetBackup starts with the highest number that is available in the allowed range. For example, if the range is from 1023 through 5000, NetBackup chooses 5000 (if port 5000 is free). If 5000 is in use, port 4999 is chosen.

Client port window

This property specifies the range of non-reserved ports on this computer that are used to connect to NetBackup on other computers. This setting applies to the selected host that connects to a client that is configured to accept only non-reserved ports.

That means that the Allow non reserved ports property is enabled in the Universal Settings dialog box.

See About the Universal Settings properties.

To let the operating system determine the non-reserved port to use, enable Use OS selected non reserved port.

Client reserved port window

This property specifies the range of reserved ports on this computer that are used for connecting to NetBackup on other computers. This setting applies to the selected host that that is configured to accept only reserved ports.

That means that the Allow non reserved ports property is enabled in the Universal Settings dialog box.

See About the Universal Settings properties.

The default range is 512 through 1023.

To let the operating system determine the non-reserved port to use, enable Use OS selected non reserved port.

Server port window

This property specifies the range of non-reserved ports on which this computer accepts connections from NetBackup on other computers. This setting applies to the selected host that connects to a client that is configured to accept only non-reserved ports.

That means that the Accept connections on non reserved ports property is enabled in the Universal Settings dialog box.

See About the Universal Settings properties.

Server port window does not appear in a client configuration.

The default range is 1024 through 5000.

To let the operating system determine the non-reserved port to use, enable Use OS selected non reserved port.

Server reserved port window

This setting specifies the range of local reserved ports on which this host accepts connections from NetBackup on other hosts. This setting applies to the selected host that connects to a client that is configured to accept only reserved ports.

That means that the Allow non reserved ports property is enabled in the Universal Settings dialog box.

See About the Universal Settings properties.

The default range is 512 through 1023.

This property does not appear in a client configuration.

To let the operating system determine the non-reserved port to use, enable Use OS selected non reserved port.



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