TAC Gateway also gives users a new level of SharePoint file sharing. SharePoint was originally intended for internal use within an organization, allowing employees to easily store and share documents. As such, links to SharePoint documents don’t have public IP addresses, only internal ones. So, if a user passes a link to a SharePoint document to someone outside the organization, the address will be broken – the remote user won’t be able to access the document.
The Total Access Control Gateway uses host address translation to turn that internal link into a public one. But that public link doesn’t connect directly to the SharePoint application. Instead, it terminates at the TAC Gateway, which can ensure the remote user is authorized to view and/or manipulate the document. If so, the gateway resolves the public address to one that SharePoint can understand and allows the user access to the document.