Is it possible to have access to MT clients from X86 server (through L2TP/IPSEC), when both clients run a DHCP client service to receive LAN address from ISP modems, when both those LANs are the same (e.g. 192.168.100.x/24) ?

Server MT is not behind NAT and has public IP 150.150.150.1

Windows is a remote dedicated server with public IP 150.150.140.1

Client one has received from ISP modem 192.168.100.5

Client two has received from ISP modem 192.168.100.5

Both clients connect through L2TP/IPSEC to 150.150.150.1

If I want to access from 150.150.140.1, through Winbox, either client MT’s for management only, and no other devices in that LAN, what would be the best way (over the active link)? A member here, had mentioned through VLAN, but if someone could be a little more specific, I would be grateful.

P.S. There might be a situation as not knowing a client's LAN subnet nor specific LAN address. Only info would be the manually entered local and remote link address e.g. local: 200.200.200.1 and remote 200.200.200.2

If you don't need to access other devices in 192.168.100.x but the Mikrotiks themselves, the fact that their local WAN subnets are the same doesn't matter. You assign an address to each L2TP client from the server, so you just have to make sure that this address doesn't fall into the local WAN subnet of the client.

Thank you Sindy !