Hi folks,
Apologies for the basic newbie question; I know a certain amount about routing and networks, but I’m new to Mikrotik OS and there’s so many options I’m thoroughly confused!
The title kinda says what I’m trying to achieve; hopefully my pathetic attempt at sketching it out makes it clearer. I want to make two Grooves (or Metals, I have a whole bunch of Mikrotik kit thanks to employer throwing a bunch out 
) act like a piece of ethernet cable, so I can connect two buildings on my property. The key thing is that the link should be ‘invisible’ to devices on either side of it, and every device should be able to see every other device on the network; the ‘remote’ devices should act as if they’re plugged in to the ‘local’ switch. Some may get IP information via DHCP from the router, some may have fixed IP addresses within that range.
Hopefully that makes it a bit clearer!
The ask: how in heck do I configure my pair of Grooves/Metals to achieve this, in simple terms? The OS is such a feature-rich environment, so many options, so many different types of network, I’m confused. I’ve tested the setup, it’s line of sight, and with decent aerials the range is no problem, I’ve somehow managed to make the Mikrotiks see each other. But I have no idea how to configure them to ‘act like a bit of ethernet’!
Thanks in anticipation.