Replying to Avatar DZC

It depends how the ISP "disabled" the line.

Maybe they just blocked access to their DNS (or even to any other DNS), and having the VPN connection you could connect with no problems to other DNS and then to wherever else in the internet because other ports were not blocked?

Can you do some nmap scan to detect which communication is blocked?
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daniele 4mo ago

At the beginning of my tests I also tried to change the DNS, and then pinging directly a remote IP; the issue is not related to the domains resolution.

How can I use nmap to find something useful here?

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DZC 4mo ago

By no means am I any expert, but I found that you can try scanning with:

$ sudo nmap -sS -Pn -T5 -p- [target- ip]