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TOPIC : GENERIC ROUTING ENCAPSULATION (GRE) - Coggle Diagram
TOPIC : GENERIC ROUTING ENCAPSULATION (GRE)
2 terms and concept :
1) overlay network
Center are connected point-to-point
2) underlay network
Packets are being routed accross multiple devices and multi networks
Tunnels create VPN overlay networks between remote sites.
Tunnels accomplish this by creating a virtual network (overlay network) on top of a physical underlying infrastructure (underlay network).
provide a logical interface that emulates a direct physical link connecting the two sites
INTRODUCTION
A non-secure,site to site VPN tunneling protocol
Transportation of multiprotocol and IP multicast traffic between two or more sites
Connect remote,geographically separated sites over an existing network,most notably routing over a public intrastructure
Characteristics
Defined as an IETF standard (RFC 2784)
IP header protocol field 47 is used to indicate GRE
GRE is stateless-tunnel endpoint does not keep any information about the state /availability of the remote tunnel endpoint.
THREE MAIN COMPONENTS:
Delivery header(Transport protocol)
Payload packet or Encapsulated protocol (Passenger protocol)-original IP packet
GRE Header (Carrier protocol)
