Gateway

An intermediate system (interface, relay) that attaches to two (or more) computer networks that have similar functions but dissimilar implementations and that enables either one-way or two-way communication between the networks. 

See CNSSI 4009-2015 (IETF RFC 4949 Ver 2) and NIST SP 800-12 Rev. 1 under Gateway (IETF RFC 4949 Ver 2) for more information. 

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