In order to setup Dragnet to recognize Vault, go to the Setup screen in Dragnet (you must be administrator to do so). The Setup screen can be accessed from the links on the right of the main page.
In the setup screen, choose “Vault” as the Source Code Control Provider”, and then provide the URL for the Vault server in the form of:
http://[vaultserver]/VaultService
Check the Require Bug ID for Checkins checkbox to require users to enter a bug ID during checkins. If Require Bug ID is enabled, users will be forced to enter a bug ID when committing an added or modified file.