When we where using Cisco VPN client, we configured preshared key, under tunnel configuration, and that preshared key had to be configured on VPN client, and on ASA. And client had to have this preshared key if he wanted to connect to ASA. Is preshared key configurable in IKEv2 when tunnel is RA? If not, how can be configured client authentication in tunnel? Not only ASA authentication with certificate that IKEv2 uses.