Person: Bradner, Scott
Loading...
Email Address
AA Acceptance Date
Birth Date
Research Projects
Organizational Units
Job Title
Last Name
Bradner
First Name
Scott
Name
Bradner, Scott
3 results
Search Results
Now showing 1 - 3 of 3
Publication A Directory Service for Perspective Access Networks(2006) Goodell, Geoffrey Lewis; Roussopoulos, Mema; Bradner, ScottNetwork fragmentation occurs when the accessibility of a network-based resource to an observer is a function of how the observer is connected to the network. In the context of the Internet, network fragmentation is well-known and occurs in many situations, including an increasing preponderance of network address translation, firewalls, and virtual private networks. Recently, however, new threats to Internet consistency have received media attention. Alternative namespaces have emerged as the result of formal objections to the process by which Internet names and addresses are provisioned. In addition, various governments and service providers around the world have deployed network technology that (accidentally or intentionally) restricts access to certain Internet content. Combined with the aforementioned sources of fragmentation, these new concerns provide ample motivation for a network that allows users the ability to specify not only the network location of Internet resources they want to view but also the perspectives from which they want to view them. Our vision of a Perspective Access Network is a peer-to-peer overlay network that incorporates routing and directory services that allow non-hierarchical organization. In this paper, we present the design, implementation, and evaluation of a directory service for such networks. We demonstrate its feasibility and efficacy using measurements from a test deployment using PlanetLab.Publication Blossom: A Decentralized Approach to Overcoming Systemic Internet Fragmentation(2005) Goodell, Geoffrey Lewis; Bradner, Scott; Roussopoulos, MemaThe Internet is systemically fragmented. We consider the causes of fragmentation, including both technical concerns, such as middleboxes and routing failure, as well as political concerns, such as incomplete peering and the structure of Internet governance. While fragmentation may be desirable in certain circumstances and for various reasons, it can also be problematic, violating central Internet design principles and rendering routine tasks difficult. We motivate the need for a system designed to facilitate connectivity throughout the Internet, providing the benefits of locality, universal access, and distributed management, while interoperating with the existing infrastructure. Finally, we describe our prototype implementation that enables overcoming fragmentation in our network testbed.Publication Perspective Access Networks(2006) Goodell, Geoffrey Lewis; Roussopoulos, Mema; Bradner, ScottPerspective Access Networks provide an infrastructure from which users can specify the location from which they wish to view the Internet. The ability to specify location has become necessary as the Internet has become increasingly inconsistent. An increasing preponderance of middleboxes, location-dependent services, and large-scale content filtering have contributed to this situation. Our work offers the following contributions. First, we propose an infrastructure that routes traffic to a location from which a given resource can be viewed, taking instructions from user-specified attributes describing the desired location. Second, we analyze the tradeoff between the expressivity of user requests and the finite resources available within the network for propagating metadata about available perspectives. Third, we stipulate a set of real scenarios that fall within the limits of what can reasonably be handled by a system appropriately tuned to manage the tradeoff, and we argue that the specific algorithm we propose can handle the scenarios effectively.