Tero Kivinen writes:
    > I would like to add one more there, i.e., ESN sent as 64-bit sequence
    > number (i.e. transmitting full ESN value in packet) in such way that you
    > send lower 32-bits first, and then you add upper 32-bits of the ESN
    > between SN and payload data, i.e., there would be upper bits of ESN
    > before first bytes of payload data (IV):

I do favor transmitting the full 64-bit ESN in packet. And I can add this 
solution in the next version.

In fact, this is one candidate solution I considered at the beginning. But I 
thought modifying the ESP packet format was a very significant change. I was 
afraid that people would think a new ESP version is required and not accept it 
by only using this notification. So I was not brave enough to write it in the 
draft v00.

Regards & Thanks!
Wei PAN (潘伟)

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