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Network slicing enables the provision of services for different verticalsover a shared infrastructure. Nevertheless, security is still one of the mainchallenges when sharing resources. In this paper, we study how WireGuard canprovide an encrypted Virtual Private Network (VPN) tunnel as a service betweennetwork functions in 5G setting. The open source management and orchestrationentity deploys and orchestrates the network functions into network services andslices. We create multiple scenarios emulating a real-life cellular networkdeploying VPN-as-a-Service between the different network functions to secureand isolate network slices. The performance measurements demonstrate from 0.8Gbps to 2.5 Gbps throughput and below 1ms delay between network functions usingWireGuard. The performance evaluation results are aligned with 5G keyperformance indicators, making WireGuard suited to provide security in sliceisolation in future generations of cellular networks.

Secure Service Implementation with Slice Isolation and WireGuard