The basic setup would to set the /27 public IP one the mikrotik, and then put this IP's on the pppoe pool. I don't know how to set this on your radius server, but the main thing is to get MK to receive those IP addresses so they can be used.
Can you post your NAT rules?
Well, I'm already using one IP from that /27 range to translate to all my clients. Let's forget about the radius server (that i'll know what to do once my configs are done) and just assume I'm using mikrotik pools to assign IPs. how would it be then?
Here is my looong NAT print:
2 chain=srcnat action=masquerade to-addresses=XXX.XXX.70.102
src-address=10.10.32.0/20 out-interface=ether1 log=no log-prefix=""
3 ;;; MDF Down
chain=dstnat action=dst-nat to-addresses=172.16.1.6 to-ports=8081
protocol=tcp dst-address=XXX.XXX.70.101 dst-port=8081 log=no log-prefix=""
4 ;;; Fiber UP
chain=dstnat action=dst-nat to-addresses=172.16.1.2 to-ports=8080
protocol=tcp dst-address=XXX.XXX.70.101 dst-port=8080 log=no log-prefix=""
5 ;;; (rule-name)
chain=dstnat action=dst-nat to-addresses=172.16.1.10 to-ports=8082
protocol=tcp dst-address=180.94.70.101 dst-port=8082 log=no log-prefix=""
6 ;;; (rule-name)
chain=dstnat action=dst-nat to-addresses=172.16.1.14 to-ports=8083
protocol=tcp dst-address=XXX.XXX.70.101 dst-port=8083 log=no log-prefix=""
7 chain=srcnat action=masquerade src-address=192.168.4.0/24
dst-address=0.0.0.0/0 out-interface=ether1 log=no log-prefix=""
8 X ;;; Local
chain=srcnat action=masquerade src-address=192.168.88.0/24 log=no
log-prefix=""
9 X ;;; Ibs Otra
chain=dstnat action=dst-nat to-addresses=XXX.XXX.127.130
dst-address=XXX.XXX.70.102 log=no log-prefix=""
10 chain=srcnat action=masquerade src-address=192.168.4.0/24 log=no
log-prefix=""
11 chain=srcnat action=masquerade src-address=192.168.5.0/24 log=no
log-prefix=""
12 ;;; Scrambled
chain=dstnat action=dst-nat to-addresses=XXX.XXX.127.130
dst-address=XXX.XXX.70.103 log=no log-prefix=""
13 ;;; nat-pak
chain=srcnat action=src-nat to-addresses=XXX.XXX.70.101
src-address=192.168.55.55 log=no log-prefix=""
And my gateway in mikrotik is xxx.xxx.70.97
thanks again