I have great issues and big puzzles regarding this issue.
My setup was working up until the moment I’ve aquired two managed industry-grade switches - Brocade ICX6610 and Zyxel XS3700.
They are running on default settings (apart their IP address in main subnet ) and they should act as unmanaged switches. Yet, main MT router cannot pass DHCP IP addresses to wi-fi clients that are connecting to VLAN based network on APs that are connected via those switches. As soon as I take out these switches out of network, everything is working fine. I’m aware that my setup has many flaws (I did all by trial and error, not exactly network expert).
If you have time, please take a look at my thread:
http://forum.mikrotik.com/t/dhcp-not-passing-ip-addresses-to-guest-wifi-clients-when-managed-switch-is-in-middle/163975/1
Thank you in advance