Captive portal on several sites - Redundancy between sites

[ced56]

Hello,

I wish to set up terminals wifi on several sites with a captive portal on each sites.
To set up a captive portal on a pfSense in version 2.0.2 RELEASE, I can make is in authentification with ticket or user/password.
What I would wish is to have a replication as of the my users or tickets on my various sites. Like that, the person who will manage the creation of user or ticket will have, to return that on 1 site (Site A) and that tightened sent directly on the remote locations (Site B and C) via the replication.

–
Site A: 10.50.0.0/16 (With different VLAN for network Customer Wifi Waiter…)
      Captive portal Master with Base User or Ticket

Site B: 10.51.0.0/16 (With different VLAN for network Customer Wifi Waiter…)
      Slave captive portal with Base User or Ticket

Site C: 10.52.0.0/16 (With different VLAN for network Customer Wifi Waiter…)
      Slave captive portal with Base User or Ticket

I did not find after some research on the Net how to make replication right for captive the portal part.
I also noted that one can make a waiter freeradius with a base user and that each sites will point above but that would be a solution of help because I would prefer with a replication between my sites.

PS: configuration of each sites
  1 Router: Case Alix 2D2 with pfSense 2.0.2 RELEASE of installed above
                Patte WAN: addresses in 10.0.49.0/24 (Connection with radio antenna between each sites)   
                Patte LAN: Site A => 10.50.0.0/16; Site B => 10.51.0.0/16; Site C => 10.52.0.0/16
  1 Switch configured with of VLAN for Client Wifi VOIP ...
  1 Wifi Terminal on each sites