Network/Socket Connection Issue

Question

Problem
Socket Connection between 192.168.1.1(Server) and 192.168.1.12(Client) can NOT be established (See Fig. 1).

Tests
Test 1: "Ping"
ping 192.168.1.2 -S 192.168.1.1 -> Success
ping 192.168.1.12 -S 192.168.1.11 -> Success
ping 192.168.1.12 -S 192.168.1.1 -> Fail

Test 2: "Socket Connection"
Socket Connection between 192.168.1.1(Server) and 192.168.1.2(Client) can be be established.
Datas have been received and sent successfully.
Socket Connection between 192.168.1.1(Server) and 192.168.1.12(Client) can NOT be established.
BeginAccept's callback at SocketSever has NEVER been called.

Test 3: "Alternate Endpoint Devices"
Socket Connection between 192.168.1.1(Server) and 192.168.1.2(Client) can be be established.
Socket Connection between 192.168.1.1(Server) and 192.168.1.12(Client) can NOT be established.
Therefore, Both of Endpoint Devices work finely (Actually they are same products)

Test 4: "Another network structure"
On another network structure, all works finely (See Fig. 2).
However i can not take this solution because i can not put a HUB between Left and Right USB-ETHERNET.

My assumption
This problem caused by that both networks are isolated and can't interact each other.
If there is any Windows application works like "HUB", it might resolve this case.

Any suggestions or solutions?

Answer 1

We have two options to make this work.

As Ron has mentioned above, the bridge is the first solution, which makes your computer a hub. Any packet is broadcasted in a single network segment.

Another options is to put these two interfaces into different subnets, then enable the ip forwarding (routing) on the computer. Then your computer becomes a router, which means that it will route the packets between these two subnet.

Hope this helps.