Maybe first make clear what you want. Is it one network 192.168.0.0/24 for both he MAP1 and te MAP2?
Or is the desired network with 2 networks 192.168.88.0/24 for MAP1 and 192.168.20.0/24 for MAP2.
I assume the first case is wanted. All clients are member of one subnet 192.168.0.0/24, the subnet of the main router
In this case only, everything is LAN, and everything is bridged.
On MAP1
- bridge ports ether1 , ether2 and the WLAN interfaces
- DHCP client on the bridge
- bridge is member of the LAN interface list (just in case you still have the default firewall active)
On MAP2
- just the same as MAP1
Then you have the DHCP server set up on the router, specifying the router address 192.168.0.1 as default gateway, and some DNS server
MAP2 and its clients talk directly to that router just as MAP1, there is no routing done in MAP2 or in MAP1
You can start from the Quick Setup “WISP AP with bridge mode” as starting point.
MAP2nD has only one wifi frequency band, so there is not the second WLAN to be added in this WISP AP as in http://forum.mikrotik.com/t/quickset-wireless-bridge-only-one-radio-works/170019/1