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Generic Routing Encapsulation
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Network Layer — Security & VPN
Protocol Overview
Full Name
Generic Routing Encapsulation
Abbreviation
GRE
OSI Layer
Network Layer
Category
Security & VPN
RFC
RFC 2784
About GRE
Tunneling protocol encapsulating a wide variety of network layer protocols inside IP tunnels. Used for site-to-site VPNs, DMVPN, and carrying multicast traffic over unicast WAN links.
Network Layer
Security & VPN
Standards Reference
GRE is defined in RFC 2784, published by the Internet Engineering Task Force (IETF). RFCs are the official standards documents for internet protocols and are freely available for public review.