Not able to ping PPPoE clients from the WAN side

[Bassam]

Dear All,
  I am providing an Internet service to a small housing area using PFSense. I am providing different subscribtion packages that some provide dynamic local IP addresses and other offers public static IP addresses. Depending on the package, subscribers can login using captive portal or to dial the PPPoE server on the PFSense.

Once a client dial a PPPoE to the server, he will get assigned a public static IP address assigned to him by our Radius server using the two parameters FRAM-IP-ADDRESS and FRAM-IP-NETMASK.

My problem is that I am not able to ping to access the HTTP serves of the PPPoE clinets from the WAN side. It is very important to remotely access the PPPoE clients from the WAN side for remote management.

Your help is much appreciated

Note: a network diagram is attached.

Regards
Bassam