Hi, I hope You can understand, my English is poor… 
I have a PPPoE server MT RouterOS based, this server assign a public IP to every client when it become to the network, all work fine but from a client I cannot reach others client on the same network…
example: CPE “A” become to the network and receive public IP 88.xx.xx.100, CPE “B” become to the network and receive public IP 88.xx.xx.101… the Client “B” cannot ping Client “A” and “A” cannot ping “B”… from another public IP I can reach clients “A” and “B”… obviously the Clients can reach every other IP but not the IP’s of PPPoE pool…
any suggestion?
Tnx!