Abstract
The Transmission Control Protocol (TCP) follows the end-to-end principle – when a client establishes a connection with a server, the connection is only shared by two physical machines, the client and the server. In current cellular networks, a myriad of middleboxes disregard the end-to-end principle to enable network operators to deploy services such as content caching, compression, and protocol optimization to improve end-to-end network performance. If server operators remain unaware of such middleboxes, TCP connections may not be optimized specifically for middleboxes and instead are optimized for mobile devices. We argue that without costly active measurement, it remains challenging for server operators to reliably detect the presence of middleboxes that split TCP connections. In this paper, we present three techniques (based on latency, loss, and characteristics of TCP SYN packets) for server operators to passively identify Connection Terminating Proxies (CTPs) in cellular networks, with the goal to optimize TCP connections for faster content delivery. Using TCP and HTTP logs recorded by Content Delivery Network (CDN) servers, we demonstrate that our passive techniques are as reliable and accurate as active techniques in detecting CTPs deployed in cellular networks worldwide.
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Acknowledgments
We thank Ruomei Gao, Chris Heller, Ajay Kumar Miyyapuram, and Kanika Shah for their invaluable insights on refining our data collection process. We also thank National Science Foundation for supporting this work through grant NSF CNS-1555591.
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Goel, U., Steiner, M., Wittie, M.P., Flack, M., Ludin, S. (2016). Detecting Cellular Middleboxes Using Passive Measurement Techniques. In: Karagiannis, T., Dimitropoulos, X. (eds) Passive and Active Measurement. PAM 2016. Lecture Notes in Computer Science(), vol 9631. Springer, Cham. https://doi.org/10.1007/978-3-319-30505-9_8
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DOI: https://doi.org/10.1007/978-3-319-30505-9_8
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