SD-WAN (Software-Defined Wide Area Network) is an overlay technology that connects branch offices, data centers and cloud services over several underlying links, and decides per application which link each flow should use. A central controller pushes policies to edge devices at every site.
Why it matters
Traditional WANs send everything over expensive private circuits. SD-WAN lets a company combine cheap internet broadband with a private line, measure loss, latency and jitter on each path in real time, and move important traffic such as voice calls to the healthiest link. Tunnels between sites are normally encrypted, and new branches can be brought online with little manual configuration.
Example
A retail chain has a broadband line and a 4G backup at each store. The policy says: card payments and VoIP use the path with the lowest latency, software updates use whichever link is cheapest. When broadband starts dropping 5% of packets, payments move to 4G within seconds, while the update download keeps using the slower path.
Common misconceptions
- SD-WAN is not a replacement for a good internet connection. It can only choose among the links you actually have.
- It does not automatically include security. Many products add a firewall, but you must check what is built in.
- It is not the same as a VPN, although it often uses VPN-style tunnels internally.
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