Yes you can have central RADIUS and multiple NAS (mikrotik) all over the country and let them authenticate it with central RADIUS. If your NASes (Network Access Servers like Mikrotik HOTSPOT) are on remote locations, (which are not reachable directly by the RADIUS server or not the same LAN), realize the following setup to get them working with Radius Manager: 1. Install a central PPtP server (Mikrotik RB750 will be enough for this) in NOC, beside the RADIUS server. Connect all your NASes (Mikrotik) to the central PPtP server with PPtP connections. The central PPtP server must have public, static IP (it must be visible for the remote NASes). PPtP server will assign static local IPs to NASes via PPtP tunnels.
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All NASes will reach the RADIUS server via PPtP tunnels and vice versa (RADIUS UDP protocol). Using this method NASes can use any IP (public, local, static, dynamic) and RADIUS server will see them on local, static IP addresses, via the PPtP tunnels. Tunnels are used for RADIUS packets only (low traffic), while the heavy Internet traffic is going through the main connection of NAS (ADSL etc.).
Like Comment by — August 4, 2011 @. The best support that you can get regarding RM is There response time is very good. They usually answers to RM related issues only. 
Usually, Once you have configured RM properly, it works fine without any hurdle. I have configured many RM in my area and they are running from many months without any issues. My personnel advise: Try not to mess up with the configuration files. What Linux disto you are using? RM works great with FEDORA 10 with all default configuration. I suggest you to install Fedora 10, then follow on the guide I have published on my Blog.
Its a step by step guide with some my own added experiences. Following is a link to the article. Like Comment by — August 24, 2011 @.
I thing 🙂 this is the best isp website that i’ve ever seen 🙂 ur amazing 🙂 i’ve a small isp company with 250users at the moment. What do u thing is the best solutions for me to work. Max customers in one mikrotik are 60users connected with Rb435G routerboard 680mhz rb. Into the others are mostly 20-50users on 433 RB. I’ve 7 routers and one RadiusMANAGER with a DELL COMPUTER 3.0GHZ 250GB HDD and 2GB RAM can i do the squid server just for webs like.php.html and not for musics and videos on the radiusmanager server with this amount of users 200-250simulations users what do u thing do i need to add on my base station now ( whats the best solutions to have a better quality for my clients ) and is there a full how to build a squid server on centOS. Like Comment by — December 30, 2011 @.
Yeah but is there a complete guide how to build a squid server from the beginning cuz im newbie on linux and want to do a squid server or do i need just to install ubuntu and then add the squid configuration file? And my quesiton was “Can i build squid server ( just for php/html pages/images) in the same computer as radiusmanager or not (radius manager is working at the moment with CentOS 6 ). And can i connect the squid server with a public ip address like the radiusmanager and mikrotiks and if i have a problem with squid server will it affect to the users or does it work like this IF SQUID SERVER IS ON, then take the bantwith from squid server if it is off then take the bantwith from INTERNET. Thanks for ur reply, ur amazing good 🙂 and sorry for my bad english 🙂 Like Comment by — December 30, 2011 @. Thanks for ur reply’s. I’m going to try to build a new server, and my another question was: does the users bantwith work like this: IF SQUID SERVER IS ON, then take the bantwith from squid server if it is off then take the bantwith from INTERNET. ( for example if squid is full or for any reasen shutdown ) do my users have internet access again or does it affect to all users and nobody gets internet then.