…tunneling any network layer in any other network layer, as in IP in GRE in IP [ RFC2784 ][RFC7588][ RFC7676 ], or inside UDP in IP [ RFC8086 ] o MPLS - a shim layer for tunneling IP over a circuit-like path over a link layer [ RFC3031 ] or inside UDP in IP [ RFC7510 ], in which i…

…/TCP options and ability to inspect packets with tunnel encapsulations (e.g., [ RFC2784 ]) or to suspend processing of packets with unknown formats. (iii) Ability to demultiplex flows (by using address/protocol/port number, or an explicit flow-id). [ RFC3135 ] describes a class o…