Step 1 | Configure FTD Radius Server Object.
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In the left pane, click Objects.
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Click > RA VPN Objects (ASA & FTD) > Identity Source.
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Provide a name and set the Device Type as FTD.
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Select Radius Server Group and click Continue. For details, see step 6 in Create a RADIUS Server Group.
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In the Radius Server section, click the Add button and click Create New Radius Server. See Create a RADIUS Server Object
In the Server Name or IP Address field, enter your Duo Authentication Proxy server's fully-qualified hostname or IP address.
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Once you have added the Duo RADIUS server to the group, click Add to create the new Duo RADIUS server group.
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Step 2 | Change the Remote Access VPN Authentication Method to Duo RADIUS.
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In the left pane, click .
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Expand the VPN configuration and click on the connection profile to which you want to add Duo.
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In the Actions pane on the right, click Edit.
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Select the Authentication Type can be AAA or AAA and Client Certificate.
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In the Primary Identity Source for User Authentication list, select the server group you created earlier.
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You typically do not need to select an "Authorization Server" or "Accounting Server".
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Click Continue.
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In the Summary and Instructions step, click Done to save the configuration.
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Step 3 | Review and deploy now the changes you made, or wait and deploy multiple changes at once. |