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# Change preferred interface for a NAS server

Network-attached storage is a file-level storage architecture that makes stored data more accessible to networked devices.

## About this task

See Understanding PowerMax File for storage systems for an overview of PowerMax File.

This control is also available from the NAS Server All Details > Network > File Interface tab.

The preferred interface of NAS Server is an interface from which all the non-local outbound connections of this NAS Server are initiated. The preferred interfaces for IPv4 and IPv6 are independent from each other. The acting preferred interfaces, one for IPv4 and one for IPv6, are selected among active interfaces by the following rules, ordered by priority (highest first):

- Manually selected interfaces have priority over automatically selected ones.
- Production interfaces have priority over backup and DR testing ones.
- The interface with the default gateway has priority over one not having one.
- From the otherwise equal priority interfaces, one with the most routes has the priority.
- From the otherwise equal priority interfaces, one with the minimal value of IP address has the priority

## Steps

1. Select a storage system that supports PowerMax File.
2. Select Storage > File.
3. Select the NAS SERVERS tab.
4. Select a server, click , and select Change Preferred Interface.
5. Modify the values for the IPv4 or IPv6 production and backup IP interfaces.
6. Click OK.