In your previous mail you wrote:

     > => I still don't understand what is the difference between
     > x and hash(P1 || P2 || x) where x can be something specific
     > to this flow.
   
   => Well it doesn't have to be flow specific.

=> you wrote "x can be something specific"...

   If you're trying to avoid exposing the encryption key, you 
   can use x, where x is any number that both nodes are
   aware of.

=> I don't understand why the peer has to be aware of x.
Do you want to provide QoS inside end nodes? IMHO this is
not a bad idea because the CPU is far faster than I/O subsystems,
i.e. this is the wrong place.
BTW most implementations don't provide an API to get the received
flow ID or label, just because this is not considered as useful.

Regards

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