routing system
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... Routing.
A request routing system uses a set of metrics in an attempt to
direct users to surrogate that can best serve the request. For
example, the choice of the surrogate could be based on network ...
... earlier sections in order to optimize the performance of the
Request-Routing System. Appendix A provides a summary of possible
metrics and measurements techniques that could be used by the
Request-Routing system ...
... Routing System. Appendix A provides a summary of possible
metrics and measurements techniques that could be used by the
Request-Routing system to choose a given surrogate.
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o In DNS based Request-Routing systems servers may be required to
return DNS entries with a short time-to-live ...
... addresses are not relayed within DNS requests.
This limits the ability of the Request-Routing system to determine
a client's proximity to the surrogate.
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... the close inspection of client's requests. In this approach, the
Request-Routing system inspects the information available in the
first packet of the client's request to make surrogate selection
...
... be used as a first step in deciding on an appropriate surrogate with
more accurate refinement made by the transport-layer Request-Routing
system.
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Application-layer Request-Routing systems perform deeper examination
of client's packets beyond the transport layer ...
... knowledge of the requested objects enable application-layer
Request-Routing systems to provide better control over the selection
of the best surrogate.
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Request-Routing systems can use a variety of metrics in order to
determine the best surrogate that can serve a client's request. In
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Proximity measurements can be used by the Request-Routing system to
direct users to the "closest" surrogate. In this document proximity
means round-trip time ...
... means round-trip time. In a DNS Request-Routing system, the
measurements are made to the client's local DNS server ...