Cannot see PC in headset.

[SRF]

Hi,

My network is setup as per the above diagram. When connecting to the router which is connected to the internet (the one on the left of the diagram) I can see my PC available for connection, however this router cannot be connected by cable to my PC.

When connecting the headset to the second router, on the right of the diagram, which is connnected to the PC via ethernet cable and in the same room as the headset, I cannot see my PC, and therefore cannot connect.

Does anyone have any idea how I can rectify this?

Thanks.