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BT loopback problem

BT loopback problem

BT loopback problem

I need to connect to my second pc from my first pc using a game client that connects using an external IP.
Both my pcs are behind the BT hub which is set to route all incoming traffic to the first pc.
The BT hub doesn't allow loopback and I can't connect at a local level using 192.168.x.x because the server files only allow external OR internal connections, not both.

Is there any way I can circumvent this problem apart from buying a new BT HH5 hub or other ?
Can I somehow use the host file, either on the sending or recipient machine ?
I have been able to connect to a local BT free wifi hotspot but this is only accessible sporadically.

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