About This Architecture

Multi-site SSL VPN infrastructure using FortiGate firewall, OpenVPN gateway, and FreeRADIUS authentication to securely connect HQ, branch offices, and remote clients across isolated VLANs. Internet traffic flows through the FortiGate WAN interface with NAT and VPN policies, then to the HQ OpenVPN server which bridges the 10.8.0.0/24 VPN zone and enforces RADIUS-based access control. Branch routers and remote laptops establish SSL VPN tunnels to the central gateway, receiving dynamic IPs within the VPN subnet while maintaining segmentation between Admin (VLAN 10) and User (VLAN 20) networks. This architecture demonstrates zero-trust segmentation with inter-VLAN isolation and centralized authentication, critical for organizations requiring secure remote access without compromising internal network boundaries. Fork this diagram on Diagrams.so to customize subnets, add additional branch sites, or integrate alternative VPN protocols and firewall vendors.

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How do you design a multi-site VPN infrastructure that securely connects branch offices and remote clients while maintaining VLAN isolation and centralized authentication?

This diagram shows a FortiGate firewall protecting the WAN edge, routing VPN traffic to a central OpenVPN gateway (10.8.0.1/24) with FreeRADIUS authentication. Branch routers and remote laptops tunnel to the gateway, while Admin (VLAN 10) and User (VLAN 20) networks remain isolated with blocked inter-VLAN traffic, enforcing zero-trust segmentation.