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Specifying a preferred network interface

Why to specify a preferred network interface  Top

You can specify the preferred filer network interface to be used when establishing an NDMP data connection to another filer.

By default, an NDMP data connection uses the same network interface as the NDMP control connection established by the NDMP backup application. However, when a data connection between NDMP-enabled filers needs to be established over an alternate network, it is necessary to specify the filer's interface through which the alternate network will be accessed.

For example, a UNIX or NT resident NDMP backup application and multiple filers can be interconnected via a corporate network. The same filers can also be interconnected via an isolated private network. To minimize load on the corporate network, the ndmpd.preferred_interface option can be used to direct all NDMP data connections over the isolated private network.

How to specify a preferred network interface  Top

To specify the preferred network interface to be used for NDMP data connections, complete the following step.

Step

Action

1

Enter the following command:

options ndmpd.preferred_interface interface

interface identifies the network interface to be used for all NDMP data connections. Any network interface providing TCP/IP access can be specified. If no argument is specified, the command returns the name of the interface currently configured for data connections. If no interface is currently set, it reports disable.

You can find the available network interfaces by using the ifconfig -a command.

Note
The ndmpd.preferred_interface option is persistent across filer reboots.

How to turn off data connection specification  Top

To disable a preferred network interface specification and force the NDMP default interface to be used for data connections, complete the following step.

Step

Action

1

Enter the following command:

options ndmpd.preferred_interface disable
Result

NDMP does not use the preferred interface for data connection.

The default value for the ndmp.preferred_interface option is disable.

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