Debugging faults in complex networks often requires capturing and analyzing traffic at the packet level. In this paper, DataCenter Networks (DCNs) present unique challenges with their scale, traffic volume and diversity of faults. To troubleshoot faults in a timely manner, DCN administrators must identify affected packets inside large volume of traffic; track them across multiple ...
In this paper, the authors present a demonstration of a real-time distributed MIMO system, DMIMO. DMIMO synchronizes transmissions from 4 distributed MIMO transmitters in time, frequency and phase and performs distributed multi-user beamforming to independent clients. DMIMO is built on top of a Zynq hardware platform integrated with an FMCOMMS2 RF front end. The platform ...
In this paper, the authors present BackFi, a novel communication system that enables high throughput, long range communication between very low power backscatter IoT sensors and Wi-Fi APs using ambient Wi-Fi transmissions as the excitation signal. Specifically, they show that it is possible to design IoT sensors and Wi-Fi APs such that the Wi-Fi AP ...
Many network middleboxes perform Deep Packet Inspection (DPI), a set of useful tasks which examine packet payloads. These tasks include Intrusion Detection System (IDS), exfiltration detection and parental filtering. However, a long-standing issue is that once packets are sent over HTTPS, middleboxes can no longer accomplish their tasks because the payloads are encrypted. Hence, one ...
Meraki is a cloud-based network management system which provides centralized configuration, monitoring and network troubleshooting tools across hundreds of thousands of sites worldwide. As part of its architecture, the Meraki system has built a database of time-series measurements of wireless link, client and application behavior for monitoring and debugging purposes. This paper studies an anonymized ...
Can users get network latency between any two servers at any time in large-scale data center networks? The collected latency data can then be used to address a series of challenges: telling if an application perceived latency issue is caused by the network or not, defining and tracking network Service Level Agreement (SLA), and automatic ...
The increasing need for ubiquitous Internet connectivity has led to the deployment of wireless access infrastructure, including public Wi-Fi networks used for mobile data offloading. Despite the density of public Wi-Fi hotspots especially in residential areas, these networks are severely underutilized, with an average of ten percent of active users and an average of one ...
In this paper, the authors introduce MMPTCP; a novel transport protocol which aims at unifying the way data is transported in data centers. MMPTCP runs in two phases; initially, it randomly scatters packets in the network under a single congestion window exploiting all available paths. This is beneficial to latency-sensitive flows. During the second phase, ...
Many network functions executed in modern data centers, e.g., load balancing, application-level QoS (Quality of Service) and congestion control, exhibit three common properties at the data plane: they need to access and modify state, to perform computations and to access application semantics – this is critical since many network functions are best expressed in terms ...
A common pattern in the architectures of modern interactive web-services is that of large request fan-outs, where even a single end-user request (task) arriving at an application server triggers tens to thousands of data accesses (sub-tasks) to different stateful backend servers. The overall response time of each task is bottlenecked by the completion time of ...