We have Mikrotik RB2011UIAS. We are using PPTP Vpn. It is working okay, but we have 1 problem that, it allows only 1 vpn access from 1 public ip address. I mean, if user A connected from the ip address for example 5.132.12.11, then user B cannot connect from that ip address. But user B can connect from the different ip address. Why is it so? Coudl you please help me to solve this problem?