|dc.description.abstract||Overlay networks are viewed as one of the solutions addressing the inefficiency and slow
evolution of the Internet and have been the subject of significant research. Most existing
overlays providing resilience and/or Quality of Service (QoS) need cooperation among
different network providers, but an inter-trust issue arises and cannot be easily solved.
In this thesis, we mainly focus on network-provider-independent overlays and investigate
their performance in providing two different types of service. Specifically, this thesis
addresses the following problems:
Provider-independent overlay architecture: A provider-independent overlay
framework named Resilient Overlay for Mission-Critical Applications (ROMCA)
is proposed. We elaborate its structure including component composition and
functions and also provide several operational examples.
Overlay topology construction for providing resilience service: We investigate the topology design problem of provider-independent overlays aiming to provide resilience service. To be more specific, based on the ROMCA framework, we
formulate this problem mathematically and prove its NP-hardness. Three heuristics are proposed and extensive simulations are carried out to verify their effectiveness.
Application mapping with resilience and QoS guarantees: Assuming application mapping is the targeted service for ROMCA, we formulate this problem as
an Integer Linear Program (ILP). Moreover, a simple but effective heuristic is
proposed to address this issue in a time-efficient manner. Simulations with both
synthetic and real networks prove the superiority of both solutions over existing
Substrate topology information availability and the impact of its accuracy on overlay performance: Based on our survey that summarizes the methodologies available for inferring the selective substrate topology formed among a group
of nodes through active probing, we find that such information is usually inaccurate
and additional mechanisms are needed to secure a better inferred topology. Therefore, we examine the impact of inferred substrate topology accuracy on overlay
performance given only inferred substrate topology information.||en_US