Yes, captive portal failover on WLCs i think. We do not support that behavior yet, it is on our roadmap to do it that way but not yet. What it can be done right now, is the group policy to bypass the captive portal for the clients you desired, and keep the regular behavior (captive portal) for everything else. You can create a rule on your radius if the mac auth is found, accept and send the bypass group policy, if it is not on your mac valid clients, accept and get to the captive portal without a group policy. It is adding an attribute for the group policy result. Let me know if this helps
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