What is Site-to-site VPN?

Site-to-site VPN is a network-to-network VPN connection that securely links two or more private networks over the internet or another untrusted network.

It is commonly used to connect headquarters, branch offices, data centers, and cloud environments so users and systems at each location can reach approved internal resources without exposing traffic directly to the public internet.

How does it work?

A Site-to-site VPN uses VPN gateways, usually firewalls, routers, cloud gateways, or dedicated VPN appliances, at each network edge. These gateways authenticate each other, negotiate encryption settings, build an encrypted tunnel, and route selected traffic between the connected networks.

Most deployments use IPsec with IKE for authentication and key exchange. Administrators define routes, allowed subnets, encryption parameters, failover options, and logging so the tunnel carries only trusted business traffic.

Site-to-site VPN vs remote access VPN

A Site-to-site VPN connects entire networks, so users usually do not launch a VPN client individually. Once traffic matches the configured route, the gateway handles the encrypted connection in the background.

A remote access VPN connects one user or device to a private network. It is better for mobile employees, contractors, and work-from-home scenarios, while site-to-site connectivity is better for persistent links between offices or cloud networks.

How Hexnode supports Site-to-site VPN

Hexnode does not replace the network gateway that terminates a site-to-site tunnel. It supports the endpoint side of the architecture by helping IT teams keep managed devices compliant, visible, and ready to use trusted network services.

With Hexnode UEM, teams can enforce security policies, deploy certificates and VPN profiles where applicable, monitor endpoint compliance, manage applications, run patch workflows, and trigger remote actions. This reduces the chance that unmanaged or noncompliant devices become the weak point behind a trusted tunnel.

When should organizations use it?

Organizations should use a Site-to-site VPN when two trusted networks need continuous, encrypted connectivity. Common use cases include branch-to-headquarters access, cloud migration, backup replication, shared enterprise applications, and partner network integrations with strict routing rules.

It is less suitable when access must be limited to individual users, unmanaged devices, or highly granular application-level permissions. In those cases, remote access VPN, zero trust network access, or per-app VPN may offer tighter control.