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This article gives an overview of the most promising technologies for service providers to offer virtual private network services. The focus of this article is on the analysis of the scalability implications of these virtual private network mechanisms on existing service provider backbone networks. Very often, when deploying VPN services, service providers will be confronted with a trade-off between scalability and security. VPNs that require site-to-site interconnectivity without strongdoi:10.1109/35.1000229 fatcat:z4bgdjcgqrcrhaliz3bewjs5ry