Testing the Site to Site connection
Now the Site to Site network is created and started, let's test the
connection.
Use your PC or Phone to connect to one of the Node of this Site to Site,
and use browser to access another Node's LAN ip, if you see the login
page, the connection between these two nodes is worked.
For example, my PC connect to Node 1 device, and then I use browser to
access Main Node's LAN IP (192.168.48.1), if I see the login page, it means
the connection between Node1 and Main Node is worked.
Route and other options
You can change each device's LAN IP and routes.