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Is this a safe way to test my firewall (ufw) on Linux?
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I trust Steve Gibson and I have listened to his podcast for years. Without trust, his tool does no more than what any other internet citizen can do, so even if you don't trust it, it's a trial by gentle fire.
Personally I recommend listening to security now podcast. But then again I've worked in IT for 15 years so it's kind of my thing.
Ps if you want to be scared, look up showdan. Maybe look at showdan YouTube examples.