Current setup.
Tower - Mikrotik 2.9.x acting as PPPoE server
Client - Mikrotik 2.9.x acting as PPPoE Client (3 LAN Ports).
Server is handing the client a 172.x.x.x address which is then NAT’d
before going to the internet. All is good 
Client now wants to add 1 device with a public IP address. But we
want to keep the current setup.
So now we have LAN1 - to radio, LAN2 - to internal network, LAN3 - New
Server with public IP address.
How can I do this?
Can I have two pppoe seesions off the LAN1? If so how do I separate
then to LAN2 and LAN 3?
Can I bridge LAN3 & the current PPPoE link? But how do I route
traffic to server?
Can a single PPPoE client have multiple IP addresses?