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Requirements
REQ-1: A NAT MUST have an "External NAT Binding is endpoint independent" behavior (NB=I).
REQ-2: It is RECOMMENDED that a NAT have a "No port preservation" behavior.
REQ-2a: A NAT MAY use a "Port preservation" behavior.
REQ-2b: A NAT MUST NOT have a "Port overloaded" behavior.
PPT Version