Hi!
I have a case.
There are several interfaces vlan (vlan per switch). All of them are joined to bridge, and split-horizon on bridge is turned on. An IP interface is bound to bridge. So, there is a problem with L3 communication between hosts in different vlans in the same IP network. To prevent this problem, it should be configured something like Cisco local proxy arp. I know, that there is not such feature in RouterOS now, and, probably, bridge nat can help me.
Am I right? If so - how to configure it?