What should be the banaction choice in the jails?

[debashisparial]

What should be the banaction in the jails? can it be iptables-multiport, iptables-ipset-proto6 or any others?

[melroy89]

Yes see also: https://serverfault.com/questions/1082564/fail2ban-ipset-which-conf-to-use

Try to use iptables-ipset-* nowadays instead of this custom scripting. Fail2ban now support ipset directly.