Generic Routing Encapsulation
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Generic Routing Encapsulation
(networking, protocol)(GRE) A
protocol which allows an
arbitrary network protocol A to be transmitted over any other
arbitrary network protocol B, by encapsulating the packets
of A within GRE packets, which in turn are contained within
packets of B.
Defined in
RFC 1701 and
RFC 1702 (GRE over IP).
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
GRE
(Generic Routing Encapsulation) A tunneling protocol developed by Cisco that allows network layer packets to contain packets from a different protocol. It is widely used to tunnel protocols inside IP packets for virtual private networks (VPNs). For example, the point-to-point tunneling protocol (PPTP) is based on GRE, and GRE is used with IPsec to transmit routing protocol data from one router to another, which IPsec does not natively support. See tunneling protocol, PPTP and IPsec.Copyright © 1981-2025 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive
The company has been a leader in testing, implementing and trialing GMPLS protocols such as Open Shortest Path First--TE, Link Management Protocol (LMP) and
Generic Routing Encapsulation (GRE).
The 800 series includes advanced secure access features such as firewall, router/route authentication, Lock and Key,
generic routing encapsulation (GRE), access control lists and encryption.
Due to a shortage of networking equipment, we found a way to reduce the equipment requirements of this ADN by removing the SIPR and CX-I routers and terminating the
Generic Routing Encapsulation Tunnel on the Layer 3 enable switch.
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