Lars, > 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? Could you please substantiate that assertion? Best regards, Ole
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