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Internet Access Networks

Internet access network infrastructures, such as cable, DSL, and cellular broadband networks, are being widely deployed. Yet, very little is known publicly about the characteristics of access network deployments in the real world. Consequently, researchers and application developers do not understand how well their systems or protocols perform over access networks. Even customers of access ISPs are often not aware of the details of their network deployments.


ISPs are increasingly deploying a variety of middleboxes (e.g., firewalls, traffic shapers, censors, and redirectors) to monitor and to manipulate the performance of user applications. Most ISPs do not reveal the details of their network deployments to their customers. The goal of our Glasnost project is to make access networks more transparent to their customers.



SatelliteLab extends the popular PlanetLab testbed with nodes from the Internet edge networks, such as cable, DSL, wireless, and cellular networks. SatelliteLab testbed is useful for researchers wanting to evaluate their distributed system prototypes in heterogeneous network environments.



A large and rapidly growing fraction of users connect to the Internet via residential cable and DSL networks. However, little is known about the characteristics (e.g., bandwidths and queue sizes) of deployed residential broadband networks. In this project, we studied the characteristics of 2,000 DSL and cable links from 11 major ISPs in North America and Europe.



Monarch is a tool that accurately emulates transport protocol flows from an end host under the experimenter's control to any other end host that responds to simple TCP, UDP or ICMP packet probes. Since many Internet hosts and routers respond to such probes, Monarch can evaluate transport protocols such as TCP Vegas, TCP Nice, and PCP over a large and diverse set of Internet paths.


Glasnost: Results from tests for BitTorrent traffic blocking[edit]

Almost 100,000 users from locations around the world have used our tool, Glasnost, to test whether their BitTorrent traffic is being manipulated. On this page, we present preliminary results from these tests. The tests were conducted between March 18th, 2008 and January 27th, 2009.

We will update this page with more detailed results as we get more data from the tests. We also hope to uncover more cases of blocking as we refine our measurement tool and our analysis. So make sure to check back later. Alternately, you can stay up-to-date on our findings by subscribing to the glasnost-updates mailing list.

We have released the source code of our tool. You are welcome to download and inspect the code. Please contact us if you find any bugs or have questions, comments, or suggestions. We published a paper on this work in the ACM Internet Measurement Conference 2008. It contains updated results up to July 25th, 2008 from more than 47,300 end users. You can download the paper in pdf format here.

Another misc page : Build_a_Wi-Fi_antenna_using_household_materials