Remote Access VPN (RA VPN) is available in Firepower Threat Defense (FTD) 6.2.1 for 2100 Platforms. For all other Platforms it will be supported on version 6.2.2.
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GRE and IP in IP Tunnels
GRE is a tunneling mechanism able to transport packets of one protocol within another protocol. The passenger protocol is the protocol carried, and the transport protocol is the protocol that is used for carrying the passenger protocol. GRE uses IP as the transport protocol and can be used for carrying many different passenger protocols (IPv4, IPv6 or non-IP protocols such as CLNS or IPX).
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