Uploaded May 2020 | Updated September 2026, 2 weeks ago

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Discussing when a firewall is needed in Linux and I show how to check what services you have open on your system. I also give a quick explanation about computer networking protocols ICMP, TCP, and UDP.

Checking services:
$ ss -nltup

Scanning System:
$ sudo nmap -sS ip
$ sudo nmap -sU -p “udp ports” ip

Tutorial Videos:
Debian nftables: youtu.be/_A-Q6yTMX0g
Ubuntu UFW: youtu.be/BJNXrV9G3QE


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#Firewall #Linux #Cybersecurity