Overlay networks

Networks which sit "above" the traditional IP layer networking.

Journal Paper
Transactions on Cloud Computing (to appear)

This paper is a simulation based study of cloud assisted multi-user video streaming. It is based upon two use cases (one related to video poker the other related to MOOCs). The paper looks at strategies for placing cloud locations to facilitate streaming using Amazon EC2 cloud locations. The paper compares a strategy that dynamically picks new locations for cloud hosts as time goes on. Interestingly this seems to provide little benefit compared with simply having a good initial choice of sites even when users may drop into and out of a cloud chat session over the course of many hours.

Paper review
Content Based Traffic Engineering in Software Defined Information Centric Networks
Abhishek Chanda, Cedric Westphal and Dipankar Raychaudhuri

This paper describes Information Centric Networks over Software Defined Networks. Applications are

  1. Traffic engineering in ICN

  2. Content based firewall

  3. Network wide cache management

Per-flow granularity not sufficient for content based routing. Some routing can be done based on content length. Meta-data is extracted from ICN interest and data packets. This can be via

  1. Network layer extraction of content length – classified into mouse/ elephant.

Paper review
Improving content delivery using provider-aided distance information
Ingmar Poese, Benjamin Frank, Bernhard Ager, Georgios Smaragdakis and Anja Feldmann

This paper looks at CDN networks and, in particular, suggests Provider-aided Distance Information System (PaDIS), which is a mechanism to rank client-host pairs based upon information such as RTT, bandwidth or number of hops. Headline figure, 70% of http traffic from a major european ISP can be accessed via multiple different locations. “Hyper giants” are defined as the large content providers such as google, yahoo and CDN providers which effectively build their own network and have content in multiple places.

Paper review
Serval: An End-Host Stack for Service-Centric Networking
Eric Nordstrom, David Shue, Prem Gopalan, Robert Kiefer, Matvey Arye, Steven Y. Ko, Jennifer Rexford and Michael J. Freedman
USENIX Symposium on Networked Systems Design and Implementation

This paper looks at the problem of accessing services on a network which are potentially geographically distributed (for example, the closest server for a particular service). Serval allows the discovery of end-points for services and allows them to seamlessly migrate so ‘‘end-points can seamlessly change network addresses, migrate flows across interfaces… [with] uninterrupted service access." Serval runs on an unmodified network layer. Application communicate with service names (identifying the changing group of hosts providing a service) not addresses and ports.

Conference paper
Networking 2011, Lecture Notes in Computer Science (6640)

This paper creates a simple mathematical model based on Markov chains which can model (with some simple assumptions) the type of cacheing trees seen in content centric networking. The model is tested with some simulation results.

Conference paper
Networking 2012, Lecture Notes in Computer Science (7290)

This paper considers the tradeoffs when ISPs collaborate with content providers for mutual benefit.


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