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# Create or modify route to external service

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 File.

## Steps

1. Select a storage system that supports File.
2. Select Storage > File.
3. Select the NAS SERVERS tab.
4. Select the NETWORK tab.
5. Select the ROUTES TO EXTERNAL SERVICES tab.
6. Click Create to create a route. Alternatively, select an existing route and click Modify to modify the route properties.
7. Select a value for Source. Type values for Gateway, Destination, and Network.
8. Click OK.