Protocol boosters

“…Surprisingly, there are very few active network projects that exploit the active nodes' capability of application-specific packet processing to improve quality of Internet voice or audio transmissions. The work we are aware of is [BET98], [FMSB98], [MHMS98]. In [BET98] active nodes add an optimal amount of redundant data on a per-link basis to protect audio streams against packet loss.…”

Section: Related Workmentioning

confidence: 99%

Deploying an Active Voice Application on a Three-Level Active Network Node Architecture

Carle¹,

Sanneck²,

Zander³

et al. 2001

Active Networks

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Abstract. Active networks have been recently highlighted as a key enabling technology to obtain immense flexibility in terms of network deployment, configurability, and customized packet processing. However, this flexibility is often achieved at the cost of router performance. In this paper, we present a three-level node architecture that combines flexibility and high performance of network nodes. We design and implement an active network application for real-time speech transmissions on top of this three-level platform. In our application, plug-in modules are downloaded onto certain network nodes to monitor packet loss rate of voice streams and to perform application-specific packet processing when necessary. In particular, we propose to perform loss concealment algorithms for voice data streams at active network nodes to regenerate lost packets. The regenerated speech data streams are robust enough to tolerate further packet losses along the data path so that the concealment algorithms at another downstream node or at the receiver can still take effect. We call our approach reactive concealment for speech transmission to distinguish it from concealment performed at the receiver and also proactive schemes like Forward Error Correction. Our approach is bandwidth-efficient and retains the applications' end-to-end semantics.

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“…Active Networks follows the approach first proposed in the "Protocol Boosters" project [6], of enabling on-the-fly modifiScott Alexander, William Arbaugh, and Angelos Keromytis are each working toward a Ph.D. in Computer and Information Science at the University of Pennsylvania.…”

Section: Introductionmentioning

confidence: 99%

A secure active network environment architecture: realization in SwitchWare

et al. 1998

Self Cite

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Active Networks is a network infrastructure which is programmable on a per-user or even per-packet basis. Increasing the flexibility of such network infrastructures invites new security risks. Coping with these security risks represents the most fundamental contribution of Active Network research. The security concerns can be divided into those which affect the network as a whole and those which affect individual elements. It is clear that the element problems must be solved first, as the integrity of networklevel solutions will be based on trust of the network elements.In this paper, we describe the architecture and implementation of a Secure Active Network Environment (SANE), which we believe provides a basis for implementing secure network-level solutions. We guarantee that a node begins operation in a trusted state with the AEGIS secure bootstrap architecture. We guarantee that the system remains in a trusted state by applying dynamic integrity checks in the network element's run time system, using a novel naming system, and applying node-to-node authentication when needed.

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Protocol boosters

Cited by 84 publications

References 12 publications

Performance Enhancing Proxies Intended to Mitigate Link-Related Degradations

Performance Enhancing Proxies Intended to Mitigate Link-Related Degradations

Deploying an Active Voice Application on a Three-Level Active Network Node Architecture

A secure active network environment architecture: realization in SwitchWare

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