Wifi Hotspot using user-manager - link two remote sites?

I have a running wifi hotspot using user-manager and all is working great. My client would like to add a second site in a different location and I want to use the same user database for both, so that for instance a user could buy a voucher at Hotel1 and use it in Hotel2 should he so desire. The two locations are not within wireless range of each other, so it would have to be done using a vpn or something. Any advice?

aaaaaaaanyone??

The best way to use User-Manager with routable IP address, then all the routers may reach it and use it database.
In case both router and User-Manager use private IP address, it is not possible to establish any VPN without additional configuration on next-hop routers for User Manager or Wifi-HotSpot.

thanks sergejs, if i understand correctly, on my first routerboard i need to have a public ip, so the adsl (that’s what we’re using) router would need a dynamic dns address or static ip, then forward traffic from the remote routerboard to the ip of the first routerboard? then i set up the remote hotspot using the first routerboard ip as the radius server address?

I see only one issue.

I just tried setting a “Router” up in usermanager.
It demands an IP address, not a name.

Soo.. Not only do you need a static address for the “Radius server” (Usermanager) but you need one for the “Radius client” as well.

An option that would work, but it affect the overall configuration is a secure tunnel between the routers.
(See Butch Evans for this one)

Also some sort of dynamic dns script to update both sides (See ChangeIP for this one)

Craig..