Hi, the last paragraph of the introduction reads:
An extension to Path MTU Discovery defined in this document can be found in [RFC4821]. It defines a method for Packetization Layer Path MTU Discovery (PLPMTUD) designed for use over paths where delivery of ICMP messages to a host is not assured. Given that ICMP delivery cannot be assured over the vast majority of paths in the current Internet, should this document make a recommendation to implement RFC4821? Also, even if ICMP delivery is assured, there are additional complications for UDP, which has been seeing a lot of interest both as a tunneling encapsulation and for applications (e.g., QUIC). Many platforms do not provide UDP-sending applications any information about arriving ICMP messages that were triggered by their transmissions. So even if the path delivers ICMP, the OS makes ICMP-based PMTUD for UDP often impossible. Another reason to recommend 4821? Lars
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