The DTLS protocol used by Cisco AnyConnect servers was based on a non-standard, pre-release draft of DTLS 1.0, until support for the DTLS 1.2 standard was added in 2018. [7] [8] OpenConnect and ocserv implement an extended version of the AnyConnect VPN protocol (which has been proposed as an Internet Standard [9] ), within an open-source

Remote Access VPN Authentication with Cisco ISE – Security May 26, 2019 Tunneling Protocols :: Chapter 9: Cisco IOS IPSec Layer 2 Tunneling Protocol (L2TP) L2TP is an emerging IETF standard and one of the key building blocks for VPNs in the dial access space. L2TP combines the best features of Cisco’s Layer 2 Forwarding (L2F) and Microsoft’s Point-to-Point Tunneling Protocol (PPTP), enabling mobile workforces to connect to their corporate intranets or extranets wherever and whenever they require. Google Cloud VPN Interop Guide

VPN Protocols: What they are, How they work

Layer 2 Tunneling Protocol (L2TP) L2TP is an emerging IETF standard and one of the key building blocks for VPNs in the dial access space. L2TP combines the best features of Cisco’s Layer 2 Forwarding (L2F) and Microsoft’s Point-to-Point Tunneling Protocol (PPTP), enabling mobile workforces to connect to their corporate intranets or extranets wherever and whenever they require. Google Cloud VPN Interop Guide Google Cloud VPN Interop Guide Using Cloud VPN With Cisco® ASA Courtesy of Cisco Systems, Inc. Unauthorized use not permitted. Cisco® is a registered trademark or IKE is a key management protocol that facilitates the management of IPsec-based communications. It is used to authenticate IPsec peers, negotiate and distribute

Cisco VPN client on-line help says: IPSec over UDP - this port is negotiated and can not be changed - but never able to find any mention of how it is negotiated. Looking at Sniffer packets - beside UDP 500, Sometimes UPD 62515, and other time UDP 62514 was used. UDP 10000 was never used. Thanks

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