The related work in Section 3 has different approaches when dealing
with locators. FARA proposes to consider the transport-layer
port numbers as part of the forwarding directive. It adds an Association
ID to multiplex between different communication instances
existing between the entities at the same time. SNF proposes
similar ephemeral connection identifiers. Other proposals
favor keeping the existing port-based application point of attachment.
For legacy interoperability, Ambient Networks attempts to
maintain established use of port numbers, but relax the current usage
model by allowing port numbers to change on the path between
the communicating applications.