I was experimenting with firewall configuration. As I understand there are iptables - there is saved configuration. But as additional tool - ufw can be installed for simpler configuration. I installed it and experimented. Btw I checked
sudo iptables --list
and there was some lines like
Chain OUTPUT (policy ACCEPT) target prot opt source destination ufw-before-logging-output all -- anywhere anywhere
but I did not touch them. Maybe ufw changes them. Not sure.
I played around with uwf - adding some rules, removing them. ANd then I disabled uwf. WHen I done this - the old configuration is still filtering which was in iptables, right?
I don't want to leave without firewall :D