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The Definition of an Address Pair
Address pair
A pair of addresses (src, dst) used in communications between two peers

Operational address pair
Both addresses are locally operational
Traffic flows when the pair is used

Note 1: due to NATs, firewalls, etc. the operational status may depend on the type of traffic (IKEv2, HTTP etc)
Note 2: there can be many address pairs if both peers have multiple addresses -- and hard to know a priori which ones work
PPT Version