Azure-Hosted RADIUS Authentication Platform Modernisation
A leading global provider of fibre broadband access and optical transport solutions partnered with Plexinor to replace its ageing RADIUS systems with a resilient, Azure-hosted authentication platform. The transformation enhanced scalability, visibility, and reliability while preparing the network for future growth and new access technologies.
About the Client
Industry: Telecommunications
Customer: A leading global provider of fibre broadband access and optical transport solutions
Location: United Kingdom
Type: National broadband and network services provider
Objective: Modernise subscriber authentication using a secure, cloud-based, future-ready RADIUS architecture.
The Challenge
The client relied on legacy, on-premise RADIUS systems that were increasingly difficult to scale and maintain. They needed a modern authentication platform capable of supporting future service growth while maintaining strict security and performance standards.
Key requirements included:
A cloud-native RADIUS platform
High-availability authentication services
Secure integration with the existing on-prem network
Support for future access technologies
A scalable design aligned with subscriber growth
The transformation needed to preserve security, ensure performance stability, and avoid operational disruption.
Why Plexinor Was Selected
The provider chose Plexinor Technologies for our proven capabilities in delivering telecom-grade authentication modernisation projects, specifically our:
Deep expertise in RADIUS, networking, and cloud platforms
Clear and complete HLD and LLD documentation
End-to-end deployment strategy
Hands-on PoC execution and validation
Strong engineering discipline and reliability
Our Engineering Approach
Architectural Design (HLD + LLD)
Plexinor developed the complete cloud-hosted authentication architecture, covering:
Azure network and security design
Scalable RADIUS server topology
End-to-end traffic flow and failover sequencing
SQL subscriber database integration
Operational workflows, observability, and maintenance planning
Proof of Concept Build in Azure
A full PoC was deployed to validate real-world behaviour, including:
Azure-hosted RADIUS servers in a high-availability setup
Secure site-to-site VPN connectivity between Azure and on-premises
Azure Load Balancers for efficient traffic distribution
Managed SQL database serving as the authoritative subscriber store
Full Authentication Path Validation
The validation phase covered:
End-to-end authentication flows (client → on-prem → Azure)
RADIUS request and response handling
Real-time subscriber lookups
Failover behaviour, load handling, and overall reliability
This confirmed the platform’s scalability, resilience, and operational suitability.
Before & After Transformation
Area | Before Plexinor | After Plexinor |
Authentication Platform | Legacy, on-prem, difficult to scale | Cloud-native, elastic, future-ready |
High Availability | Limited and manual | Built-in redundancy through Azure |
Visibility & Control | Fragmented | Centralised and cloud-managed |
Database Architecture | Static on-prem database | Managed SQL with real-time queries |
Future Readiness | Constrained | Fully aligned with cloud evolution |
Outcome
Plexinor delivered a production-ready cloud RADIUS architecture that enabled the telecom provider to:
Confidently migrate authentication services into Azure
Support new access technologies at scale
Reduce operational complexity and risk
Modernise authentication for long-term growth
What Happens Next?
The provider is now preparing for:
Expansion into additional geographic regions
Deployment of cloud-hosted policy engines
Automation of subscriber provisioning
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Azure-Hosted RADIUS Authentication Platform Modernisation
A leading global provider of fibre broadband access and optical transport solutions partnered with Plexinor to replace its ageing RADIUS systems with a resilient, Azure-hosted authentication platform. The transformation enhanced scalability, visibility, and reliability while preparing the network for future growth and new access technologies.