rfc9827v3.txt   rfc9827.txt 
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network and not for the packets that receivers get. This is network and not for the packets that receivers get. This is
because network behavior may break some of these properties (e.g., because network behavior may break some of these properties (e.g.,
packet duplication would break sequence number uniqueness). packet duplication would break sequence number uniqueness).
* The properties of sequence numbers are interpreted in a broad * The properties of sequence numbers are interpreted in a broad
sense, which includes the case when sequence numbers are absent. sense, which includes the case when sequence numbers are absent.
Given this updated definition, Transform Type 5 in the "Transform Given this updated definition, Transform Type 5 in the "Transform
Type Values" registry [IKEV2-IANA] has been renamed from "Extended Type Values" registry [IKEV2-IANA] has been renamed from "Extended
Sequence Numbers (ESN)" to "Sequence Numbers (SN)" in the sense that Sequence Numbers (ESN)" to "Sequence Numbers (SN)" in the sense that
it defines the properties of the sequence numbers in a broad sense. it defines the properties of the sequence numbers in general.
It is expected that new Transform IDs will be defined for this It is expected that new Transform IDs will be defined for this
Transform Type in the future (like in G-IKEv2 [G-IKEv2] for the case Transform Type in the future (like in G-IKEv2 [G-IKEv2] for the case
of multicast SAs). Documents defining new Transform IDs should of multicast SAs). Documents defining new Transform IDs should
include descriptions of the properties the sequence numbers would include descriptions of the properties the sequence numbers would
have if the new Transform ID was selected. In particular, the have if the new Transform ID was selected. In particular, the
descriptions should include discussion of whether these properties descriptions should include discussion of whether these properties
allow replay protection to be achieved. allow replay protection to be achieved.
Some existing protocols (like Implicit IV in ESP [RFC8750] or Some existing protocols (like Implicit IV in ESP [RFC8750] or
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