On Tue, 20 Feb 2007, Narayanan, Vidya wrote:
Maybe filter signalling is sufficiently more restricted case
of piggybacking arbitrary data that devising framing, PMTUD,
etc. for it is simpler. I might agree with that if the
filters were restricted to be (say) less than 500 bytes so
that no fragmentation was never needed.
Maybe I am missing something here, but, how does UDP help with
fragmentation? The alternative proposed at the transport layer seems to
be UDP-based.
If a packet carries data or signalling from a single application only,
handling correct packetization of data that application may wish to
send is rather straightforward because just one application needs to
be concerned.
If a packet may carry data from multiple sources (e.g., MIPv6,
filters, even arbitrary applications) every one of these will need to
be involved and interact in the packetization process.
However, the second case gets simpler if you'd use MTU=1280, disable
PMTUD, and fragment every packet that exceeds the MTU without trying
to optimize the payloads such that no fragmentation was necessary.
Maybe this was the model you were suggesting and a reason for the
disconnect.
--
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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