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CCNP Security SISAS 300-208 Official Cert Guide by Kevin Redmon, Aaron Woland

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MAC Authentication Bypass

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The first bandage to help with non-authenticating policies is for the authenticator to act on behalf of the endpoint that does not have a supplicant. In this scenario, the authenticator crafts a RADIUS Access-Request message and sends it to the authentication server. The authenticator uses the endpoint’s MAC address as the identity.

The authentication server (the RADIUS server) performs an authentication lookup using that MAC address as the credential. If that MAC address is in a list to be given access to the network, a RADIUS Access-Accept message is sent back from the authentication server to the authenticator. This ...

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