FreeTDS User Guide: A Guide to Installing, Configuring, and Running FreeTDS
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# What it does

The `interfaces` file aliases a dataserver name to the hostname and port number of the dataserver's machine. When FreeTDS receives a request to connect to a database server, it looks up the dataserver name in `interfaces`. There, it finds the machine name (or address) and port number to connect to, that is, the port where the database server is listening.

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