> 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.
are you talking about API, or any other protocol interactions?
please clarify.
in either case.
- with multicast, it is very difficult to perform effective PMTUD,
so applications are implemented using minimum MTU (1280).
- with unicast, applications either use minimum MTU (1280), or
rely on kernel layer fragmentation mechanism.
itojun
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