In PMTU RFC 1981 Most of the implementation scenarios have been considered.
This RFC suggests that the IP layer stores PMTU information, so that PMTU information can be shared across different packetization layer. If IP layer discovers PMTU information due to the packet sent by one of the packetization layer (Assume TCP), when other packetization layer (UDP/RAWIP) uses this PMTU information, we must notify about this PMTU information to Application layer which is using UDP/RAWIP as packetization layer. This implementation scenario is missing in RFC 1981. TCP application sends a packet to destination with Link MTU as PMTU, PMTU discovery happens IP layer stores PMTU information corresponding to this destination address and inform TCP layer about the same. When UDP/RAWIP application send packets to the same destination, IP layer make use of learned PMTU information and fragments the packet. But UDP/RAWIP application must be notified of this PMTU value.
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