Can't access a computer behind a router

How to share two computers separated by a router

Situation: The client just added one wireless router in they network that makes the network as two subnet, 192.168.0.0/24 and 192.168.1.0/24.

Problem: The wireless computer behind the wireless router can access any computers outside the router, but none of computers in the outside can't access the wireless computer even they have enable sharing and have correct setup.

Cause: Normally, routers are one-way traffic meaning they allow outbound but not inbound except you open the ports for the outside access.

Resolution: 1. Setup the router as DMZ so that outside computer can access the inside computer.

2. Open the ports need for sharing.

3. Setup the router as a switch so that all computers are in the same subnet.

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