The Linux firewall can filter ports but can it also block ip addresses from securing a connection?
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Yes, Ubuntu uses ufw firewall, check here https://help.ubuntu.com/community/UFW – Michal Przybylowicz Jul 31 '19 at 00:40
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3Possible duplicate of How can a non-geek set up a proper firewall? – Fabby Jul 31 '19 at 08:47