ufw

setting ufw rules…..

1. Read the rules:

~$ sudo ufw status numbered
Status: active

     To                         Action      From
     --                         ------      ----
[ 1] Anywhere                   DENY IN     xxx.xxx.xxx.xxx
[ 2] Anywhere                   DENY IN     xxx.xxx.xxx.xxx
[ 3] 22                         ALLOW IN    Anywhere
[ 4] 80                         ALLOW IN    Anywhere
[ 5] 25                         ALLOW IN    Anywhere
[ 6] 22 (v6)                    ALLOW IN    Anywhere (v6)
[ 7] 80 (v6)                    ALLOW IN    Anywhere (v6)
[ 8] 25 (v6)                    ALLOW IN    Anywhere (v6)

2. Delete some numbered rule (delete rule number 1):
sudo ufw delete 1

Now importantly: Rule number 2 is now known as rule number 1,
So to delete that rule, do sudo ufw delete 1 again 😉
or refresh the list with sud ufw status numbered

3. Create a new rule, to ban all trafic from some ip-number:
sudo ufw insert 1 deny from xxx.xxx.xxx.xxx

-> this sets a new rule at first place in the rule list.