Re: Flow label versus Extension header - protocol itself

[Francis Dupont <Francis.Dupont@enst-bretagne.fr>]

 In your previous mail you wrote:

   I think that at the moment I agree with you that flow labels should be
   used if the existing definitions of flow labels can be accomodated
   (few though they are).
   
=> the problem with the overloading of flow labels is this should likely
break all other possible usages of flow labels (not a surprise).
For instance if flow labels are changed to be allocated after the first
packet and/or by the receiver.

   The original assumption was that flow labels (in general, rather than in
   shim) would be sender selected.  Marcelo has mentioned that there may
   therefore be pre-shim flow labels in existence at negotiation time.
   
=> the flow label is selected by the sender before it sends the first
packet. IMHO shim stuff should not touch the flow label, i.e., the only
real but marginal question is whether the flow label should be reset when
an address in the IPv6 header is changed (there are pros and cons, and in
fact it doesn't really matter :-).

Regards

Francis.Dupont@enst-bretagne.fr