PPTP Dynamic IP Pool round robin way.

Dear All Members,
I am not expert on mikrotik.I need a help to resolve my problem.I have one PPTP server with dynamic remote address ip pool.When i am connect to internet through PPTP vpn always get same IP address.I want to configure PPTP round robin way.Like if i disconnect & connect then i will get new IP address from the pool.I need cordial help from all of my expert members.

Regards

Akash

Going in ppp, secret
You see username and password for PPTP server
Open this username and you see ip address in (Remote address), this ip the same you seen on remote pptp client.
Clear or remove the ip address from secret in remote address.
Now you try connect pptp client.
Regards