connect multiple mikrotik to each other through VirtualBox

RouterOS Beginner Basics
1

Hello ,
I have installed Oracle’s Virtual Box machines . I have 6 Mikrotiks running on separate machines and I want to test some routes,NATs and some firewall rules on them . Please tell me how can I have access to my mikrotik from another mikrotik (all running on a same VirtualBox ) as the picture bellow.
for example I want to ping mikrotik1 from mikrotik6 and same for the other devices on this machine..

2

Start by setting all VMs networking mode as “bridge device”.

Once you’ve done this on all of them, all VMs will be in the same L2 segment, i.e. as if they were all connected to the same switch.