I have a setup mini ISP and i am using mikrotik router for that. I have setup the PPPOE server and authenticating the users through that. My subnet is 172.16.1.0/24. users are sharing the data and their subnet is 192.168.1.0/24 but i am unable to access their machine. Topology diagram is also attached. Please help to fix this issue.
If on the 17 network you should have access (ping) to the TPLink devices but not the devices (PCs) behind the TP LINK. Double NAT scenario.
Thus the best you can hope for is to make changes to the TPLink devices if you have WAN management access setup.
But is 172.16.1.3/30 not the broadcast address for network 172.16.1.0/30?