The Cisco IOS GETVPN is a tunnel-less VPN technology that provides end-to-end security for network traffic in a native mode and maintaining the fully meshed topology. It uses the core network's ability to route and replicate the packets between various sites within the enterprise. Cisco IOS GETVPN preserves the original source and destination IP addresses information in the header of the encrypted packet for optimal routing. Hence, it is largely suited for an enterprise running over a private IP-enabled network such as MPLS VPN, VPLS, or FR/ATM. It is also better suited to encrypt IP-based multicast and broadcast traffic which might traverse a satellite network or IP multicast enabled core. Cisco IOS GET VPN uses the IETF's standard RFC-3547 Group Domain of Interpretation (GDOI) as the key management protocol and RFC-2406 for IPSec for encryption.
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