Hi!

I need to create a network on RB751G-2HnD in the next setup:
1. wifi users must get mikrotik dhcp addresses and have internet access from mikrotik nat
2. all other ports must be transparent swith, so ether1 -- wan to ISP and ether2-5 -- transparent switch to same ISP.

My current working setup is:
I create two bridge interfaces: br-wan and br-lan.
br-lan ports is only wlan1 interface.
br-wan ports is all ether interfaces.
I add nat and firewall limits on br-wan.

Is it right setup or there maybe much better setup in my network?
Thank you.

Make ether3-5 slave interfaces to ether2
Make only 1 bridge and add the wlan interface and ether2 to it.

Make ether3-5 slave interfaces to ether2
Make only 1 bridge and add the wlan interface and ether2 to it.

Seems you dont understand me

I need 1 mikrotik to work AS 1 unmanaged switch and 1 wifi-only-router (dhcp-server + nat).

Then you don't need any bridges at all
Just make ether2-5 slaves to ether1.
Put dhcp server and nat on your wlan interface.

Then you don't need any bridges at all
Just make ether2-5 slaves to ether1.
Put dhcp server and nat on your wlan interface.

Aha! But, what interface will have IP address and make NAT for wifi-users?

You can put a public ip on ether1 and internal ip on wlan1 to be the gateway for wireless clients