Скачать или смотреть How GRE works - encapsulating packets in tunnels

GRE (Generic Routing Encapsulation) is a tunneling protocol that encapsulates one network protocol inside another IP packet to create secure and logical point-to-point links. GRE adds a new GRE header and outer IP header to the original packet, allowing transport of multicast traffic and dynamic routing protocols like OSPF and EIGRP across different networks. Although GRE itself does not provide encryption, it is commonly combined with IPsec for secure site-to-site VPN deployments. Understanding how GRE works is essential for CCNA, CCNP, and enterprise networking professionals.

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#GenericRoutingEncapsulation
#Networking
#NetworkSecurity
#VPN
#CiscoNetworking
#CCNA
#CCNP
#WAN
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