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I made a bootable USB to try another linux distribution. When the OS was booted up, I checked iptables
and it was all ACCEPT. I suppose it's not safe to use with working internet connection. I may be overcautious but what do other overcautious people do in such a case?
You can configure your protection before you use the internet, but you will need to redo this on each boot. – AFH – 2019-01-06T20:26:04.347