VPN has been the default way to connect remote workers to office systems for two decades. SD-WAN has entered the conversation as a more flexible alternative for multi-site businesses. If you have heard both terms and want to understand when each one is appropriate, this post explains the practical difference for a BC SMB.
What a VPN Does
A virtual private network (VPN) creates an encrypted tunnel between a remote device and a central server, typically at your office or cloud environment. Traffic through the tunnel is encrypted, so it cannot be read by anyone monitoring the connection. The remote device appears to be inside your network for access control purposes.
Traditional VPN is simple, well-understood, and widely supported. The limitation is that it routes all traffic through a central hub. This creates a bottleneck: a remote worker in Kelowna connects to VPN in Prince George, then their Microsoft 365 traffic goes from Kelowna to Prince George to the internet and back - even though the nearest Microsoft datacentre is in Vancouver.
What SD-WAN Does Differently
Software-Defined Wide Area Networking (SD-WAN) manages connectivity across multiple internet links intelligently, routing traffic based on application type, link quality, and policy. Cloud applications like Microsoft 365 can be routed directly to the nearest Microsoft datacentre from the local site, while sensitive traffic to on-premises systems routes through an encrypted overlay.
For a business with multiple office locations, SD-WAN eliminates the inefficiency of backhauling cloud application traffic through a hub site. Each location gets optimal paths for each type of traffic.
When VPN is the Right Answer
VPN is appropriate for most BC SMBs with 10 to 30 employees at a single site or primary remote work scenario. If you need to give remote staff secure access to on-premises systems (a file server, a local application, a network printer), a properly configured VPN with split tunnelling handles this reliably.
Always-on VPN via Microsoft Intune is a good option for M365 Business Premium customers. It automatically connects managed Windows devices to VPN when they are off the corporate network, without requiring users to manually connect.
When SD-WAN Makes Sense
SD-WAN becomes relevant when you have two or more office locations that need reliable interconnection, or when a single location has multiple internet links that need to be managed intelligently for redundancy and performance. For a Prince George head office with a Fort St. John satellite office, SD-WAN provides a better user experience than site-to-site VPN.
SD-WAN also makes sense when your cloud application performance over VPN is noticeably poor. If Teams calls drop when connected to VPN, split tunnelling or SD-WAN with direct cloud breakout is the fix.
Cost and Complexity Comparison
Business VPN for a 20-person company costs $30 to $80 per month in software licensing plus minimal hardware. SD-WAN for a two-site deployment typically costs $200 to $600 per month including hardware and management. The investment is higher, but so is the reliability and performance.
For most single-site BC SMBs under 50 users, VPN with proper split tunnelling is the right cost-performance choice. Multi-site organisations or those with performance-sensitive applications should evaluate SD-WAN.