be more specific about two identical servers?
how they exist with same ip addressing in real time?
When i mean identical servers, i mean same profiles. It's obvious that they should have different ip addresses, and they will NAT accordingly to the IP you assigned.
I am about to set up the same thing but my RADIUS server is handing out static, public, ip addresses. What I am trying to figure out is how to route packets coming back in (from Internet). How do I know which of the two MikroTik PPPoE servers
is the appropriate "next hop"?
Your configuration requires some kind of dynamic routing (usually IBGP does the job) between the PPPoE servers and your gateway