Install Multi-DB: server's IP address


I'm confusing... In the Step 3: db-config.php it asks to inform my server’s IP address at line 16 of the db-config.php

1) Which is that IP? The dedicated IP of my multisite wp? Or the IP of my computer? Do I have to inform the complete IP?

2) In I have to inform "DB Remote Host". How to know if I use a remote DB?