Why don't devices see each other on Mikrotik in LAN?

Question

network hardware

Mikrotik 951, I decided to do the setup from scratch according to the guide www.technotrade.com.ua/Articles/mikrotik_router_se...
Internet via LTE modem, all 5 Ethernet ports are used as local ones. Combined them and Wi-Fi in Bridge, exactly as in the link. Everything works perfectly, BUT: devices in LAN do not see each other, shared folders are inaccessible, pings do not go. Disabled completely all the rules in the firewall - all the same.
I have not tried to combine devices through the master-port - I still don’t understand what it is and what is the difference.

Answer 1

I didn't want to figure it out. I dropped it and did everything again according to the manual from the habr - it started up.