A site-to-site VPN tunnel allows two or more secure networks to communicate as if they were on the same local network. This usually requires dedicated equipment like firewalls, routers, or dedicated VPN appliances from Cisco, Fortinet, or Palo Alto. Here’s how to create a VPN tunnel on any device. Typically used by businesses, this type of VPN tunnel helps securely connect international offices and enables resources to be shared safely across locations.