Meaning of GRE for the USG6000

The Generic Routing Encapsulation (GRE) protocol encapsulates data packets of certain network-layer protocols, so that the encapsulated packets can travel through another network-layer protocol. GRE is one of the tunneling technologies and is an L3 tunneling protocol. The GRE provides a transmission path for encapsulated packets by establishing a virtual point-to-point connection.

Other related questions:
GRE tunnel configuration on the USG6000
GRE security options of the USG6000
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