“…Finally, cloud brokering has been one of the most explored federation architectures, both in industry and academia. [13,6,4,14] and projects [3,5] on cloud brokering, that help cloud customers to cope with a variety of cloud interfaces, instance types, and pricing models, by providing intermediation, arbitrage, and aggregation capabilities. Regarding the networking capabilities of the above mentioned federated platforms (based on peer, hybrid, or broker architectures), most of them rely on public IP addressing to access compute instances deployed in different clouds, or use VPN tunneling mechanisms to improve security that usually are manually configured by the user.…”