I did those Tutorials
I need to protect port 53. I am having an mass-attack.
> Jun 16 12:05:25 domain pdns: Not authoritative for 'adobe.com',
> sending servfail to 188.8.131.52 (recursion was desired)
I do not allow external recursion.
Do you know how to configure Fail2ban for port 53?
Thanks and Best Regards,