I don't have a router, how do I port forward?

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Ok, I was able to host before w/ no router.

One day, I couldn't host. At the time, I thought I had successfully port forwarded, until that moment. I can't port forward because I don't have a router. Something was letting me host with out port forwarding, now it's not.

What was it, and why is not letting me host.

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Come on, someone help me! No one replies because my 'Help' topics are too complicated.

[General Nick]

If you don't have a router, you can't port forward, because your connection goes straight to the Internet from there.

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If you don't have a router, you can't port forward, because your connection goes straight to the Internet from there.

I still don't understand how I was able to host before.

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Problem solved. Switched to file sharing, and took everything off firewall until I come up with a safer solution.