Hello,
I’m quite a newb when it comes to networking.
I recently upgraded from RouterOS 5 to 6 (RB450G) and reset all settings.
Now I can’t find network shares in LAN anymore (Windows).
I guess it has to do with the switch.
In the"ARP List" I have:
192.168.88.2 ether2-master-local (my computer)
192.168.88.3 ether2-master-local (other computer)
The other computer is connected to the physical port eth3, so I wonder why it is listed as ether2. I guess it should be ether3-slave-local to be able to switch.
I tried to bind the IP 192.168.88.3 to the interface ether3-slave-local (by “Address List” and/or a static route) but couldn’t get it working.
How to do it properly, please?
Thanks 
arp list reflects the state of the IP interface itself, which is only the master switch port.
This is normal. Imagine your router only had a single LAN port, and then you connected a 5-port dumb switch to the LAN interface, and then plugged your computers into that switch. This is exactly how the Mikrotik behaves when you use the switch feature. The slave ports are no longer usable for IP-level configurations such as firewall, dhcp, simple queues, queue trees, etc… They all behave just the same as the master port.
If you need to see the actual interface where a MAC address lives, you can go into the switch menu, host tab.
And yes, ether3 should be set to use ether2 as the master - just go into the interfaces menu, edit ether3 and set master port = ether2
(the name doesn’t need to be master-local or slave-local or anything like that - you could rename one to “bert” and the other to “ernie” if you wanted)
In general, ether1 = wan port (master=none), ether2 = master lan (master=none), ether3 through ether5 = slave lan (master=ether2)
One final note - most Mikrotik products only allow one master port in a given hardware switch. (I think the CRS might let you use multiple masters, but I’m not sure - I’ve never had one to play with)
Thank you.
The problem was a disabled windows service 
(“TCP/IP NetBIOS Helper” in particular)
I’m sorry for that.