Authors: Ananya Paul
Abstract: The growing adoption of distributed enterprise networks, cloud services, and remote work has created a critical need for secure, reliable, and scalable connectivity across multiple sites. Traditional VPN solutions, while effective in point-to-point scenarios, often face limitations in flexibility, scalability, and performance when applied to complex multi-site networks. Hybrid VPN frameworks, which integrate site-to-site VPNs, remote access VPNs, and cloud-based VPN services, offer a comprehensive approach to addressing these challenges. By combining the strengths of conventional and cloud-native VPN technologies, hybrid frameworks enable dynamic routing, optimized bandwidth usage, and enhanced security across distributed environments. This review examines the concept, architecture, and operational impact of hybrid VPN frameworks on multi-site connectivity. It explores enabling technologies such as software-defined networking (SDN), software-defined WAN (SD-WAN), cloud VPN gateways, and centralized management platforms. The paper also analyzes techniques for secure and efficient connectivity, including encryption strategies, traffic prioritization, failover mechanisms, and automated policy enforcement. Challenges such as integration complexity, interoperability, latency, and security vulnerabilities are discussed, along with mitigation strategies. Finally, the review highlights industry applications and future research directions, emphasizing how hybrid VPN frameworks are critical for achieving secure, resilient, and high-performance multi-site connectivity in modern enterprise networks.
DOI: http://doi.org/10.5281/zenodo.17882844
