RFC 1787:Routing in a Multi-provider Internet
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IP


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... at the network layer (IP) is the set of destinations (hosts) that can ...
... Despite all the diversity among the providers, the Internet-wide IP connectivity is realized via Internet-wide distributed routing ...


... The technique of encapsulation allows for the creation of a "virtual" IP overlay over an existing IP infrastructure. This has certain implications for the Internet ...
... encapsulation allows for the creation of a "virtual" IP overlay over an existing IP infrastructure. This has certain implications for the Internet routing system ...



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