This page explains Captive Portal configuration for MikroTik Router OS and authentication with IronWifi.
IronWifi Console Setup
Sign in to the IronWifi Console -> Networks and create new Network. This will assign a set of RADIUS servers for your network.
Click on Networks -> Captive Portals and create a new Captive Portal. Make sure the vendor is Mikrotik. Add an Authentication Provider and download the mikrotik_login.html file. Rename the downloaded file to login.html.
MikroTik AP Setup
Sign-in to your MikroTik configuration interface, usually http://192.168.88.1
Navigate to Hotspot -> Users and add a temporary user called user1.
Set some password for this new user.
Navigate to Hotspot -> Servers and click the Hotspot Setup button.
Hotspot Interface: bridge
Local address of network: 192.168.89.0/24
Masquerade Network: on
Address Pool of Network: 192.168.89.10 - 192.168.89.254
Select Certificate: none
You will be redirected to the default Hotspot Authentication page. Sign in as "user1" and return to the Mikrotik configuration interface http://192.168.88.1
Navigate to Hotspot -> Server Profiles and click the newly created profile called hsprof1
In the Login by section, un-check HTTP CHAP, un-check Cookie and check HTTP PAP. Also, check the Use RADIUS checkbox.
Navigate to IP -> Hotspot -> Walled Garden IP List and allow access to the IronWifi global load-balancer - 126.96.36.199.