Hi There 
I have some problems trying to get my external Captive Portal working through my mikrotik ( x86 Ver. 3.7 ) bridge.
This mikrotik is making a bridge between 2 nodes :
Senao Node <-----------> MikrotiK Bridge <-----------> Cisco Node
The Mikrotik is configured with 2 TP-LINK´s ( both are in Station pseudobridge ) wireless cards, and the Captive Portal is connected to the Ether interface of the Mikrotik, i have bridged this 3 interfaces and asigned and ip from the same range of the network, ive allowed dns requests, changed the setings of the firewall to forward, disabled tracking connections, and ive configured the DHCP Relay for the ip of my captive portal.
From this nodes i can get an ip assigned from the Captive Portal, but i cannot have the captive portal part ( the redirect of the pages ), my captive portal is a pc with monowall and it was working pretty fine when i was operating with 2 ap´s ( one DWL-900+ connected with Senao Node and one Cisco Aironet 1230B Connected with Cisco Node).
Can Some One Plz help me ?
Many Thanks Kry0h