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Be aware fail2ban does not handle IPv6 at all with its default configuration on Debian/Ubuntu. https://github.com/fail2ban/fail2ban/issues/1123 https://github.

by raimue 10y ago

Be aware fail2ban does not handle IPv6 at all with its default configuration on Debian/Ubuntu. https://github.com/fail2ban/fail2ban/issues/1123 https://github.com/fail2ban/fail2ban/issues/1123

mwpmaybe 10y ago
Indeed. I add this to sshd_config (with a note to remove it when this fail2ban issue is resolved): AddressFamily inet
codelitt 10y ago
You're right. Took mwpmaybe's suggestion for the time being and only will accept IPv4 from ssh for now till that's fixed.