
56 Part One • Theory
assigned to a single IPv4 address as there are realms (separate IPv4
networks).
On the global IPv4 Internet, any given network interface can be accessed
with the 32-bit IPv4 address assigned to that interface. On an RSIP-enabled
IPv4 Internet, two or more routing realms can be defined. In any given
realm, the 32-bit IPv4 address will be sufficient to uniquely identify any
given interface. For the interface to be globally targeted, however, requires
the use of the address of the node plus the RSIP realm identifier.
This turns out to be a possible solution to some of the problems that NATs
pose in terms of end-to-end interoperability. ...