The current specification of Generic Routing Encapsulation [1]
specifies a protocol for encapsulation of an arbitrary protocol over
another arbitrary network layer protocol. This document describes
enhancements by which two fields, Key and Sequence Number, can be
optionally carried in the GRE Header [1]. The Key field is intended
to be used for identifying an individual traffic flow within a
tunnel. The Sequence Number field is used to maintain sequence of
packets within the GRE Tunnel
The GRE Key and Sequence number extensions are specifically designed to provide session tracking and in-order packet delivery. The Key field helps identify the specific tunnel or session, allowing endpoints to associate packets with the correct session. The Sequence number field ensures that packets are delivered and processed in the correct order at the receiving end.
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