SD-WAN is the SASE foundation enterprises can't ignore

Secure access service edge (SASE) was originally designed to solve modern corporate problems; however, users, applications, and data are no longer confined to a corporate data centre the way they once were. From remote workers to applications running in multiple clouds, traditional network and security models are no longer sufficient.

SASE has shifted from industry concept to enterprise priority. A common misstep is to focus only on the cloud-delivered security without equal attention to the underlying network infrastructure and architecture.

In practice, best practice is to focus on SD-WAN first as critical enabler for effective SASE as one part of the broader, integrated design that also includes emphasis on policies, identities, and effective security controls.

SD-WAN helps organisations manage and optimise how data moves between different locations. Without a modern, intelligent, wide area network, SASE becomes nothing more than a security overlay on top of legacy infrastructure. This can lead to poor performance, visibility fragments, and inconsistent policy enforcement. In short, the promise of SASE will fail to translate into measurable business value without SD-WAN.

This risk is not theoretical. Recent research shows that fewer than half of Australian organisations believe their cloud investments have delivered the benefits they expected. (1)  A key reason is because legacy systems are moved to the cloud with minimal architectural modernisation. The lesson is clear: transformation fails when the underlying infrastructure remains unchanged.

This is particularly important as organisations respond to two major trends accelerating SASE adoption. The first is the rise of hybrid work, which has become standard across many industries. Data from the Australian Bureau of Statistics show that 36 per cent of people in employment typically work from home. (2)

When employees work from home, the perimeter that cybersecurity was once built around no longer exists. Users connect from unmanaged networks, meaning security can't rely on location anymore, it must follow the user. SASE delivers cloud-based security at the edge, closer to wherever the user connects. However, for that model to work effectively, traffic must be intelligently routed to the appropriate security inspection point and application destination, making SD-WAN critical for organisations that follow a hybrid approach.

SD-WAN provides the network intelligence that supports a secure direct access to cloud services while avoiding unnecessary backhaul through a central data centre. Without SD-WAN, remote traffic may take inefficient routes which in turn will degrade overall performance.

This becomes even more critical as organisations embrace digital-first strategies, where applications and workloads are increasingly distributed across public and multi-cloud environments.

These shifts make traditional network models inadequate as traffic no longer flows neatly between a branch office and a central data centre. It moves from remote users to SaaS (Software-as-a-Service) platforms, between cloud providers, and across hybrid environments.

When traffic flows directly between users, branches, and cloud environments, security teams lose a single inspection point, which creates internal visibility gaps. Policies applied in one location may not be enforced in another, resulting in fragmented management and increased risk.

SASE assumes core architectural capabilities across all edges of the network; however, those capabilities depend on a modern network foundation. SD-WAN can be that foundation as it provides the application awareness, dynamic path selection, and centralised orchestration required to make SASE effective in the modern workplace.

SASE is a fundamental change in how networking and security are designed, not just a security transformation. If organisations attempt to layer cloud security onto a legacy WAN, they will struggle with performance and policy inconsistency. SD-WAN acts as the control layer that aligns connectivity and protection and, without it, SASE cannot deliver on its potential.

By introducing SD-WAN first, organisations gain greater visibility into application flows, stronger segmentation aligned to zero trust principles, and a unified framework for managing both networking and security. This reduces complexity while strengthening cybersecurity posture across hybrid and multi-cloud environments.