determining conditions to differentiate message? types

i was told that the "if (EAP-Message)" condition would not differentiate between MAC auth and normal .1x, and that i need to capture and read the packets a bit more to make that differentiation. where can i go to find more info about how to do that? how do i find what are conditions that i can key off of? i am looking to do radius vlan assignment, and need to work through getting the conditions identified properly and replying correctly. thanks in advance, brendan