Konstantina Papagiannaki

Multi-Context TLS (mcTLS): Enabling Secure In-Network Functionality in TLS

By: 
David Naylor, Kyle Schomp, Matteo Varvello, Ilias Leontiadis, Jeremy Blackburn, Diego R. L?pez, Konstantina Papagiannaki, Pablo Rodriguez Rodriguez, Peter Steenkiste
Appears in: 
CCR August 2015

A significant fraction of Internet traffic is now encrypted and HTTPS will likely be the default in HTTP/2. However, Transport Layer Security (TLS), the standard protocol for encryption in the Internet, assumes that all functionality resides at the endpoints, making it impossible to use in-network services that optimize network resource usage, improve user experience, and protect clients and servers from security threats. Re-introducing in-network functionality into TLS sessions today is done through hacks, often weakening overall security.

Can user-level probing detect and diagnose common home-WLAN pathologies

By: 
Partha Kanuparthy, Constantine Dovrolis, Konstantina Papagiannaki, Srinivasan Seshan, Peter Steenkiste
Appears in: 
CCR January 2012

Common Wireless LAN (WLAN) pathologies include low signal-to-noise ratio, congestion, hidden terminals or interference from non-802.11 devices and phenomena. Prior work has focused on the detection and diagnosis of such problems using layer-2 information from 802.11 devices and special purpose access points and monitors, which may not be generally available. Here, we investigate a user-level approach: is it possible to detect and diagnose 802.11 pathologies with strictly user-level active probing, without any cooperation from, and without any visibility in, layer-2 devices?

Public Review By: 
Renata Teixeira

This paper addresses the emerging problem of troubleshooting WiFi pathologies in home networks (where devices connect via a single access point). The paper focuses on identifying three pathologies: low signal-to-noise ratio (SNR), hidden terminals, and congestion. Previous tools have used support of lower layers to identify these pathologies and hence are tied to specific hardware. Instead, this paper relies solely on user-level probing. It proposes techniques that distinguish the three pathologies based on probe pairs between an end-host connected to the WLAN and a server connected to the access point through an Ethernet connection. The paper evaluates the techniques in small testbed. All reviewers single out the novelty and promise of user-level probing to identify WLAN pathologies making this paper a great work-in-progress report. The reviewers also point out some shortcomings of the current solution and evaluation. The need to deploy a wired computer undermines the usability of the approach, because many home networks don’t have such a machine. Although the solution is mostly hardware and software agnostic, for the experiments to work the authors had to change the configuration of the WiFi driver. Thus, the tool requires knowledge of interfering features of the driver. Reviewers had other specific comments on some of the assumptions, the accuracy of the techniques, and a number of suggestions for future work. Authors and reviewers agree that we need further research before the technique presented in this paper can become a practical solution.

c-Through: Part-time Optics in Data Centers

By: 
Guohui Wang, David G. Andersen, Michael Kaminsky, Konstantina Papagiannaki, T.S. Eugene Ng, Michael Kozuch, and Michael Ryan
Appears in: 
CCR October 2010

Data-intensive applications that operate on large volumes of data have motivated a fresh look at the design of data center networks. The first wave of proposals focused on designing pure packetswitched networks that provide full bisection bandwidth. However, these proposals significantly increase network complexity in terms of the number of links and switches required and the restricted rules to wire them up. On the other hand, optical circuit switching technology holds a very large bandwidth advantage over packet switching technology.

DIRC: Increasing Indoor Wireless Capacity Using Directional Antennas

By: 
Xi Liu, Anmol Sheth, Michael Kaminsky, Konstantina Papagiannaki, Srinivasan Seshan, and Peter Steenkiste
Appears in: 
CCR October 2009

The demand for wireless bandwidth in indoor environments such as homes and offices continues to increase rapidly. Although wireless technologies such as MIMO can reach link throughputs of 100s of Mbps (802.11n) for a single link, the question of how we can deliver high throughput to a large number of densely-packed devices remains an open problem. Directional antennas have been shown to be an effective way to increase spatial reuse, but past work has focused largely on outdoor environments where the interactions between wireless links can usually be ignored.

The ACM SIGCOMM 2009 Technical Program Committee Process

By: 
Konstantina Papagiannaki and Luigi Rizzo
Appears in: 
CCR July 2009

Selecting a technical program for a conference, and running the process so that decisions are well received by authors and participants, is a challenging task. We report our experience in running the SIGCOMM 2009 Technical Program Committee (TPC). The purpose of this article is to document the process that we followed, and discuss it critically. This should let authors get a better understanding of what led to the final acceptance or rejection of their work, and hopefully let other

Author Feedback Experiment at PAM 2007

By: 
Konstantina Papagiannaki
Appears in: 
CCR July 2007

This editorial article is put together to disseminate the experience gained through the author feedback experiment, performed at the 2007 Passive and Active Measurement (PAM) conference.

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