How to configure Encrypted GRE Tunnel with IPsec ESP security?
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When do we use the GRE?
GRE is used when packets need to be sent from one network to another over the internet.
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Generic Routing Encapsulation (GRE) is a network tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links or point-to-multipoint links over an Internet Protocol network. GRE tunnels also allow unicast, multicast, and broadcast traffic between routers but there is a problem with GRE tunnels it is clear text and GRE does not provide good-grade protection. However, we can encrypt the complete GRE tunnel with IPsec security which provides good-grade security.
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