SD-WAN comes up more and more in conversations with Perth businesses that have multiple locations or that have moved heavily to cloud applications. It's often described in technical terms that obscure a straightforward idea. This guide explains it plainly - what SD-WAN is, what problem it solves, who needs it, and what it costs.
The problem SD-WAN solves
Traditional business networking was designed for a world where all your applications lived on servers in your office. Your staff connected to a server in the server room, and your internet connection was mostly used for email and web browsing.
That world no longer exists for most businesses. Microsoft 365, Xero, Salesforce, cloud ERPs, video conferencing - all of these applications live in the cloud. Every user at every site needs a reliable, fast connection to the internet to do their work.
The old solution was MPLS - dedicated private circuits connecting your offices together and to the internet. MPLS is reliable but expensive, inflexible, and often slow to provision. For many Perth businesses with regional offices or multiple sites, the cost is prohibitive.
SD-WAN was built to solve this: get the performance and reliability of MPLS, using standard internet connections that are a fraction of the price.
How SD-WAN works - the plain English version
SD-WAN places a smart device (the SD-WAN appliance or “edge device”) at each office location. This device can connect to multiple internet circuits at once - for example, an NBN connection and a 4G/5G backup link.
Software manages traffic across all those connections in real time. It measures the quality of each connection - latency, packet loss, jitter - and routes traffic across whichever path is performing best at that moment.
If your NBN drops out, traffic automatically shifts to the 4G backup. If your primary link is congested, the SD-WAN splits traffic across both links to maximise throughput. Your staff may not even notice a link failure - the failover happens in seconds.
On top of that, SD-WAN understands which traffic is most important. A video call should get priority over a software update downloading in the background. Microsoft Teams traffic can be routed to go directly to Microsoft's network rather than hairpinning through a central office.
SD-WAN vs traditional WAN vs MPLS
| Feature | Traditional NBN/internet | MPLS | SD-WAN |
|---|---|---|---|
| Cost | Low | High | Medium |
| Reliability / failover | Single point of failure | High (dedicated circuit) | High (automatic failover) |
| Performance for cloud apps | Variable | Good (for DC-to-DC) | Excellent (optimised) |
| Multi-site management | Complex | Managed by carrier | Centralised dashboard |
| Provisioning time | Days | Weeks to months | Days |
| Suitable for cloud-first | Basic | Limited | Yes, designed for it |
Who needs SD-WAN in Perth?
Multi-site businesses
If you have two or more office locations that need to communicate - whether that's a head office and a warehouse, multiple clinics, or offices across Perth and regional WA - SD-WAN gives you a reliable, manageable connection between them without the cost of MPLS.
Businesses with unreliable internet
If your business has had NBN outages that caused real disruption, SD-WAN with a 4G/5G failover link means a single ISP outage no longer takes your business offline. The failover is automatic and typically transparent to users.
Cloud-heavy businesses
Businesses running most applications in the cloud - Microsoft 365, a cloud ERP, cloud VoIP - benefit from SD-WAN's ability to optimise traffic routing to those cloud services. Teams calls that previously dropped or lagged often improve significantly.
Businesses with remote workers needing secure access
SD-WAN platforms often include built-in VPN capabilities, allowing remote workers to connect securely to the office network without a separate VPN appliance. See our guide to business VPNs for how remote access and site-to-site VPN compare to SD-WAN.
Who doesn't need SD-WAN
A single-site business with a reliable NBN connection and no significant inter-office connectivity requirement probably doesn't need SD-WAN. A standard business-grade router and a quality ISP is typically sufficient. The value of SD-WAN comes from having multiple connections to intelligently manage or multiple locations to connect.
What does SD-WAN cost for a Perth business?
Costs vary depending on the platform, the number of sites, and whether management is included:
- Hardware / appliance - $800–$3,000 per site depending on throughput requirements
- Licensing - $50–$200 per site per month for the SD-WAN software licence
- Management - included in managed IT arrangements or priced separately
- Internet circuits - you still pay for your NBN and any backup 4G/5G SIM separately
For a Perth business with three locations, SD-WAN typically runs $500–$1,500/month total including hardware amortisation, licensing, and management. Compared to equivalent MPLS, the saving is typically 40–70%.
Common SD-WAN platforms
We work with several enterprise-grade SD-WAN platforms depending on the business's requirements - including FortiGate SD-WAN (part of the Fortinet security fabric, which integrates NGFW and SD-WAN in a single device) and Meraki MX. The right choice depends on your existing firewall, security requirements, and management preferences.
Frequently Asked Questions
What is SD-WAN?
SD-WAN (Software-Defined Wide Area Network) is a networking approach that uses software to intelligently route traffic across multiple internet connections - NBN, 4G/5G, fibre - choosing the best path in real time. It improves performance, adds redundancy, and reduces reliance on expensive dedicated circuits.
Who needs SD-WAN?
SD-WAN is most valuable for businesses with multiple office locations, heavy cloud application usage (Microsoft 365, Salesforce, cloud ERPs), or a need for high-availability internet without the cost of dedicated MPLS circuits. Single-site businesses with one internet connection typically don't need it.
Is SD-WAN expensive?
SD-WAN is significantly cheaper than traditional MPLS circuits. For a Perth business with 3–5 sites, SD-WAN typically costs $200–600 per site per month including hardware licensing and management, compared to $1,000–3,000 per site for equivalent MPLS capacity.
Multi-site or struggling with internet reliability in Perth?
We design and manage SD-WAN solutions for Perth businesses - from two-site setups to multi-location networks across WA. We'll assess whether SD-WAN is the right fit and what it would actually cost.
Talk to us about SD-WAN →For related reading, see our guides to NBN for Perth Businesses: A Complete Guide, Starlink for Business in Regional WA: When It Beats the NBN, and IT Support for Manufacturing & Warehouses in Perth.