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I run Lubuntu 18.0.4 on a Virtualbox VM hosted by Windows 10.

I added a port forwarding in Virtualbox, and I had also to add a rule for ufw. I tried:

sudo ufw allow on enp0s3 proto tcp from 127.0.0.1 to 10.0.2.2 port 8080

but this rule does not work. I had to change it to:

sudo ufw allow proto tcp from any to any port 8080

It works, but I would restrict the rule to the specific interface and IPs. I tried to add interface, from IP and to IP one by one, but they do not work.

Where I'm wronging?

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