What Is Gre Protocol?
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GRE (Generic Routing Encapsulation) is a tunneling protocol developed by Cisco Systems that can encapsulate a wide variety of network layer protocols inside virtual point-to-point links over an Internet Protocol network. It is often used to enable virtual private networks (VPNs). GRE is a simple, general purpose tunneling protocol that can encapsulate a wide variety of protocols. It is most commonly used to carry time-sensitive voice and video communications traffic over the Internet.