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Before you say It's duplicate... read! I wanted to use iptables to allow only 1 IP, but there were some issues with "state" whatever it means, and persistence of iptables.

Many people advised UFW, but I want zombie box, applied

sudo ufw default deny incoming

sudo ufw default deny outgoing

ping works, DNS works, how can I burn all using UFW but keep applications responsive based on "state" "lo" https://unix.stackexchange.com/a/11870/194331

"For example, not allowing -i lo and -o lo will certainly cause problems for certain applications"

I don't need DNS and PING and anything, I put domain name into hosts file and I want to allow 100% only 1 IP over 443 port, no extras. Possible with UFW?

UPDATE I found this very helpful, it explains what "lo" means https://www.digitalocean.com/community/tutorials/how-to-set-up-a-basic-iptables-firewall-on-centos-6

I seems like I'm going towards iptables, but if someone is UFW master, please answer.

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