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In this paper, we propose a solution to proactively mitigate DistributedDenial-of-Service attacks in 5G core network slicing using slice isolation.Network slicing is one of the key technologies that allow 5G networks to offerdedicated resources to different industries (services). However, a DistributedDenial-of-Service attack could severely impact the performance and availabilityof the slices as they could share the same physical resources in a multi-tenantvirtualized networking infrastructure. Slice isolation is an essentialrequirement for 5G network slicing.  In this paper, we use network isolation to tackle the challenging problem ofDistributed Denial-of-Service attacks in 5G network slicing. We propose the useof a mathematical model that can provide on-demand slice isolation as well asguarantee end-to-end delay for 5G core network slices. We evaluate the proposedwork with a mix of simulation and experimental work. Our results show that theproposed isolation could mitigate Distributed Denial-of-Service attacks as wellas increase the availability of the slices. We believe this work will encouragefurther research in securing 5G network slicing.

Towards Secure Slicing: Using Slice Isolation to Mitigate DDoS Attacks on 5G Core Network Slices