name: NAPT-PT
full_form: Network Address/Port Translators-Protocol Translators
context: MPLS Header Compression session negotiation can be accomplished with the LDP protocol, by adding a new TLV (Type-Length-Value) that includes the header template, flags and set of operands as described in clause 6.2.4.5.1.1. The compressor requests a label for a new IP flow (i.e., 5-tuple combination source IP address, source port, destination IP address, destination port, protocol id} via the downstream on-demand method from the decompressor, which is its LDP peer in this case. The decompressor provides the MPLS label it wants to use for this FEC back to the compressor. The decompressor also stores the mapping of MPLS label to header template+flags+operands in a local table. The compressor also specifies how the IP TTL, IP checksum, and IP length fields are to be regenerated on the other end in the FEC TLV. The compressor LSR can then compress the IP packets as per clause 6.2.4.5.1.1. When the decompressor LSR receives the MPLS frame, it looks up the MPLS label in the mapping table,
description: Network Address/Port Translators-Protocol Translators (NAPT-PT) is a technology used in telecommunications networks to enable communication between IPv4 and IPv6 hosts. It allows for the efficient use of IPv4 addresses by mapping multiple IPv6 hosts to different UDP ports on the same IPv4 address, thereby conserving IPv4 addresses.
explanation: The text describes NAPT-PT as a method used in telecommunications networks to facilitate communication between IPv4 and IPv6 hosts. It specifically mentions its role in conserving IPv4 addresses through mapping multiple IPv6 hosts to different UDP ports on a single IPv4 address. This clearly identifies NAPT-PT as a type of Network Address Translation.
section_title: 6.9.3.3.1	Network Address/Port Translators-Protocol Translators (NAPT-PT)
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