mikrotik configuration as a central server for multiple remote sites

Good evening everyone.

I set up a HOSPOT with mikrotk 5.20 on a site.
At present I am éttendre my network on another remote sites and I like to have a single server that will mikrotik generates connection tickets in 2 sites.
I use a modem that provided me with a dynamic IP address for the internet connection.
Please, I 'm stuck because I do not know how to realize that.I took you to help me find a solution to this problem.

thank you in advance and good Sunday .

The best method in my opinion is to setup a RADIUS server. It will have a list of validated usernames and passwords that allow your customers
to use your WiFI service.

User Manager that is built-in is a simplified RADIUS server. You run it on only one of your gear and all others connect to it.
It must have a fixed public IP or use dynamic DNS (such as DYN.COM) to keep the public location accurate.

Read over:
http://wiki.mikrotik.com/wiki/User_Manager/Getting_started

You can pre-print, on paper, a voucher ticket to give to your customers.
If you are not able to hand them the voucher, you will need to create a website that can talk to your RADIUS server to present the
user the username and password or to enable the user by MAC address when they arrive.

I would recommend upgrading to the latest version on each device. (Version 6.36)

Also, Steven Discher wrote a good book for more understanding of Router OS:
https://www.amazon.com/RouterOS-Example-Stephen-Discher-ebook/dp/B006U3MP7W#nav-subnav