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SD-WAN

SD-WAN (Software-Defined Wide Area Network) lets you build secure, resilient networks across geographically distributed sites using commodity Internet links — fiber, broadband, cellular, or satellite — instead of expensive private circuits. RansNet implements SD-WAN as an encrypted VPN overlay between branch devices and central gateways, with intelligent multi-WAN failover, traffic steering, and shaping layered on top.

All SD-WAN configuration is accessible under Device Settings → SD-WAN in the mfusion management interface, or via the CLI on each device.

How RansNet SD-WAN Works

A RansNet SD-WAN deployment combines four building blocks:

VPN Overlay

Each device builds encrypted tunnels (SSL/OpenVPN or WireGuard) to one or more central gateways, forming a virtual overlay network that is independent of the underlying transport. Branches reach each other and central resources through this overlay regardless of which physical link (fiber, LTE, 5G) carries the traffic.

Multi-WAN Resilience

Devices with more than one WAN uplink continuously monitor link health and steer traffic across the available links. If a primary link degrades or fails, traffic fails over automatically — keeping the tunnels and applications online without manual intervention.

Traffic Steering

Policy-based routing directs specific traffic flows down specific paths — for example, sending voice over the lowest-latency link, bulk backups over the cheapest link, and SaaS traffic directly to the Internet (local breakout) rather than backhauling it through the hub.

Traffic Shaping

QoS policies prioritize latency-sensitive traffic (voice, video, management) over best-effort data, ensuring critical applications stay responsive even when a link is congested.

In This Section

Topic Description
VPN Protocols Overview of supported tunnel protocols (SSL/OpenVPN, WireGuard) and when to use each
VPN Topology Hub-and-spoke, full-mesh, and dual-hub overlay designs
VPN Instance Configuring tunnel endpoints, keys, and overlay addressing
Multi-WAN Multiple WAN uplinks with health-checked failover and load sharing
Traffic Steering Policy-based routing to direct flows across specific links or tunnels
Traffic Shaping QoS policies to prioritize latency-sensitive traffic under congestion

Deployment Examples

For end-to-end, real-world SD-WAN deployments, see the use-case guides: