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Cloud Computing · Foundational

Site-to-Site VPN

Encrypted IPsec tunnel over the internet connecting an on-premises network to a cloud virtual network.

Definition

In AWS, a Site-to-Site VPN connection links a customer gateway device to a virtual private gateway or transit gateway using two redundant IPsec tunnels with static or BGP routing. It can be set up within hours and is cheaper than dedicated circuits but depends on internet performance. Azure VPN Gateway and Google Cloud HA VPN provide equivalent services.

Example

A branch office connects to a transit gateway with two IPsec tunnels and BGP failover.

Exam tip

VPN is quick and encrypted but has variable latency; Direct Connect/ExpressRoute/Interconnect give consistent performance.

Related terms