For additional information on the authentication types supported by these clients, see Working with IKEv2 Clients. Note that only Windows 7 (and later versions), StrongSwan 4.3, and VIA clients support IKEv2. User-level authentication through a PPP-based authentication protocol using passwords, SecureID, digital certificates, or smart cards after successful creation of the SAs. L2TP/IPsec using IKEv1 requires two levels of authentication:Ĭomputer-level authentication with a preshared key to create the IPsec SAs to protect the L2TP-encapsulated data. With L2TP/IPsec, the user authentication process is encrypted using the Data Encryption Standard (DES) or Triple DES (3DES) algorithm. L2TP/IPsec relies on the PPP connection process to perform user authentication and protocol configuration. L2TP/IPsec provides a logical transport mechanism on which to transmit PPP frames, tunneling, or encapsulation, so that the PPP frames can be sent across an IP network. The combination of Layer-2 Tunneling Protocol and Internet Protocol Security (L2TP/IPsec) creates a highly-secure technology that enables VPN connections across public networks such as the Internet. Configuring a Basic VPN for L2TP/IPsec Configuring a Basic VPN for L2TP/IPsec
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