Configure Cisco ASA IKEv2 VPN

Okta lets you manage authorization and access to on-premises applications and resources using the RADIUS protocol and the Okta RADIUS agent. With the Okta RADIUS Server Agent organizations can delegate authentication to Okta. This page describes how to configure Cisco ASA IKEV2 VPN to use EAP-TTLS and the Okta RADIUS Server Agent.

Note:

If you are using AnyConnect v4.4 and greater and ASA version 9.7.1 and greater consider using SAML.

Topics

Before you begin
Supported factors
Typical workflow

Before you begin

Meet the following network connectivity requirements before you install the Okta RADIUS agent:

Source	Destination	Port/Protocol	Description
Okta RADIUS Agent	Okta Identity Cloud	TCP/443 HTTP	Configuration and authentication traffic.
Client Gateway	Okta RADIUS Agent	UDP/1812 RADIUS (Default, you can change this when you install and configure the RADIUS app)	RADIUS traffic between the gateway (client) and the RADIUS agent (server).

Supported factors

The size of the challenge message can be too large for the RADIUS prompt if you let users enroll too many factors. Okta recommends that you enroll no more than eight factors at a given time.

Okta supports the following factors for RADIUS apps:

MFA Factor	Password Authentication Protocol (PAP)	Extensible Authentication Protocol - Generic Token Card (EAP-GTC)	Extensible Authentication Protocol - Tunneled Transport Layer Security (EAP-TTLS)*
Custom TOTP Authentication	Supported	Supported	Supported - as long as challenge is avoided. For example MFA only or "Password, passcode".
Duo (Push, SMS, and Passcode only)	Supported	Supported	Duo passcode only.
Email	Supported	Supported	Supported when the string "EMAIL" is initially sent. Refer to associated note.
Google Authenticator	Supported	Supported	Supported, as long as challenge is avoided. For example MFA only or "Password, passcode".
Okta Verify (TOTP and PUSH)	Supported	Supported	Supported as long as challenge is avoided. For example: MFA-only or "Password, MFA" for TOTP. Push can work with primary authentication with MFA as the push challenge is sent out-of-band.
Okta Verify (number challenge)	Not supported	Not supported	Not supported
RSA Token/ On-prem MFA	Supported	Supported	Supported - as long as challenge is avoided. For example MFA only or "Password, passcode".
Security Question	Supported (Password and MFA only)	Supported (Password + MFA only).	Not supported
SMS authentication	Supported	Supported	Supported when the string "SMS" is sent. Refer to associated note.
Symantec VIP	Supported	Supported	Supported - as long as challenge is avoided. For example MFA only or "Password, passcode".
Voice Call	Supported	Supported	Supported when the string "CALL" is sent. Refer to associated note.
YubiKey	Supported	Supported	Supported - as long as challenge is avoided. For example MFA only or "Password, passcode".

* RADIUS supports three authentication methods:

Password + MFA: Primary authentication using password, then the user is prompted to select factors to complete the authentication.
MFA Only: Instead of password, users enter either a one-time passcode (OTP), or one of EMAIL, SMS, CALL, PUSH (case insensitive).
Password and Passcode: Password entered immediately followed by a passcode in a request. Must be in the same request, for example: Abcd1234,879890" or "Abcd1234,SmS".

Protocols support the following authentication methods:

Protocol	Supports
PAP	Password and MFA, MFA, "Password and passcode".
EAP-TTLS	MFA only, "Password and passcode".
EAP-GTC	Password and MFA, MFA only, "Password and passcode".

Note:

Users must send the specified string EMAIL/SMS/CALL, which initially returns a failure. This results in the generation of an OTP provided using the specified method. The provided OTP can then be used for authentication.

CAUTION:

EAP-TTLS doesn't support enrollment

Authentication will fail unexpectedly when EAP-TTLS is enabled, either Okta Verify or Phone are specified as the required enrollment policy, and the user isn't enrolled in that factor.

Note:

U2F Security and Windows Hello aren't compatible with RADIUS-enabled implementations. See RADIUS applications in Okta and About multifactor authentication.

CAUTION:

Passwordless authentication

RADIUS authentication uses passwords as the primary authentication mechanism. Traditional RADIUS authentication can't be performed with passwordless users. RADIUS can use other factors for authentication when the application setting property Okta performs primary authentication is cleared. See 2FA Only (Passwordless Mode) in RADIUS applications in Okta for addition detail.

Typical workflow

Task	Description
Download the RADIUS agent	Download the Okta RADIUS Agent from the Settings > Downloads page your in Okta org. Note that there are both Windows and Linux agents. For throughput, availability and other considerations, see Okta RADIUS Server Agent Deployment Best Practices.
Install the Okta RADIUS Agent.	Install either the Windows or Linux RADIUS agents as appropriate for your environment.
Configure the app	In your Okta org, configure the Cisco ASA RADIUS app.
Configure gateway	Using the Cisco ASDM console, configure the Cisco ASA VPN to use the Okta RADIUS app.
Configure optional settings	Cisco ASA supports two optional settings: Client IP Reporting and Groups response. Configure optional settings
Configure Windows VPN	On the Windows client configure the Windows VPN.
Add root CA	Windows clients can avoid man-in-the-middle attacks by adding trusted CA certificates. On the Windows client install a trusted root CA certificate.
Test	Test the new integration.