## Transport Layer Mapping {#transport-layer-mapping}
DTLS messages MAY be fragmented into multiple DTLS records.
Each DTLS record MUST fit within a single datagram. In order to
avoid IP fragmentation, clients of the DTLS record layer SHOULD
<<<<<<< HEAD
attempt to size records so that they fit within any PMTU estimates
obtained from the record layer. For more information about PMTU issues
see {{pmtu-issues}}.
=======
attempt to size records so that they fit within any Path MTU (PMTU) estimates
obtained from the record layer.
>>>>>>> hannestschofenig-patch-40
It seems there a merge conflict.