Two lan same subnet

Is there any way to connect two lan over the web so that one act as primary with DHCP server and the second one get it’s address through the primary using two GL-iNet’s products?

Two possible scheme

  1. Scheme 1:
    Primary LAN:
    Clients (getting address from GL-MT2500/1st) connected to
    —GL-MT2500/1st LAN port (acting as DHCP Server for clients) connected with WAN port to
    ------Modem/Router (acting as DHCP Server for GL-MT2500)
    Secondary LAN:
    Clients (getting address from GL-MT2500/1st) LAN port connected to
    —LAN port GL-MT2500/2dn connected through WAN port to
    ------LAN port Modem/Router (acting as DHCP Server for GL-MT2500)

  2. Scheme 2:
    Primary LAN
    Clients (getting address from Modem/Router) and GL-MT2500/1st (not acting as router but as switch capable to be a remotely accessible switch) connected to
    —Modem/Router (acting as DHCP server)
    Secondary LAN (as previous)
    Clients (getting address from GL-MT2500/1st) connected to
    —LAN port GL-MT2500/2dn connected through WAN port to
    ------LAN port Modem/Router (acting as DHCP Server for GL-MT2500)

The result should be that clients on the secondary LAN has same subnet of the primary and can access each other as on the same LAN (for example Client A primary network IP address 192.168.8.33 and Client B secondary network IP address 192.168.8.35 can dialogue)

Not very clear about the requirement.
I think you can try bridge mode, eg on MT2500: