A system and method are provided for use in establishing secure end-to-end communication links over a VPN gateway via a network interface unit. Illustrative embodiments include establishing and providing secure communication relationships between users (customers) and companies for e-commerce and other business purposes. Each company's data and linkage to users remaining private and secure from the other participating companies as well as from the general public over the Internet. Login by user with network interface units, addressing, authentication, and other configuration operations achieved using a web page-based GUI are applied in establishing tunnels from LAN clients to desired VPN destinations. Required authentication exchanges and required encryption key exchanges facilitate the secure communications. Financial arrangements regarding the provisioning and use of network interface units are also disclosed.