Practical Industrial Internet of Things Security

Secure tunnels and VPNs

Tunnels provide secured data transport, where the payload remains isolated from the underlying infrastructure. A virtual private network (VPN) is a prevalent application of tunneling technology. VPNs provide a cost-effective and reliable mechanism to extend a private network across a public network (VPN-DEF) without requiring dedicated transport links. Virtual Private LAN Service (VPLS), pseudo-wire (PW), and Ethernet over IP are some other OSI layer 2-based tunneling solutions.

VPNs can be used to connect a single device to a remote network, or securely connect two network domains over a public network. To protect privacy, VPNs typically allow only authenticated remote access using tunneling protocols (for example, ...