| Abstract
| It used to be reasonable to expect that any two points connected tothe Internet to have the ability to hold any communication. Such an
expectation has not be reasonable for quite some time, thanks to
firewalls, NATs, and other intermediate devices. Today, we
acknowledge a new architecture and we name the functional blocks of
that architecture as well as several ways to get ends to communicate,
and how two devices could expect to communicate with each other.
This document does not define the protocols involved.
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