In your previous mail you wrote: We are not talking about changing AH v1; we are discussing AH v2. To correctly implement AH v2, one already has to be able to accommodate 64 bit sequence numbers, vs. the 32 bit sequence numbers in v1. AH v2 is still an I-D, not an RFC. So, while a change in whether to include the flow label in the ICV would make v2 not backward compatible with v1, v2 is already not backward compatible with v1 due to the required sequence number support difference. => Steve, your numbering is not compatible with the usual one, i.e., we are talking about v3... (proof by the name of the ESP v3 draft) And the ESN (extended (64) sequence number) is an option which is negociated at the SA establishment, so it is not true to say the v3 is always not backward compatible with v2 (v1 is still supported by some implementations but seems to be no more used). But one can say we have an indirect way to distinguish v2 and v3 using the ESN feature...
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