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Generic routing encapsulation
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<p>Generic routing encapsulation (GRE) is a <a href="/facts/Tunneling_protocol/jKaT1Czc">tunneling protocol</a> developed by <a href="/facts/Cisco_Systems/ocDgQt6T">Cisco Systems</a> that can <a href="/facts/Encapsulation_(networking)/xttAQnu0">encapsulate</a> a wide variety of <a href="/facts/Network_layer/L2jAtJzQ">network layer</a> <a href="/facts/Protocol_(computing)/5uady7cB">protocols</a> inside virtual <a href="/facts/Point-to-point_(telecommunications)/RmGgN1Pj">point-to-point links</a> or point-to-multipoint links over an <a href="/facts/Internet_Protocol/Qq6VeEal">Internet Protocol</a> network. </p>