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Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) Heartbeat Extension

This document describes the Heartbeat Extension for the Transport
Layer Security (TLS) and Datagram Transport Layer Security (DTLS)
protocol. The Heartbeat Extension provides a new protocol for
TLS/DTLS allowing the usage of keep-alive functionality without
performing a renegotiation and a basis for path maximum transmission
unit (PMTU) discovery for DTLS.