About EAP authentication methods

[gang liu]

Hello, I want to implement a custom with a radius of EAP authentication protocol, custom authentication protocol requires only two steps can be done interactively (using certificates for authentication). I want to know whether eap authentication protocol according to their own, or must have a four-step interaction. If it must have a four-step interaction, it needs to how to do it? I need your help, and look forward to your reply.
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