blocking IPV6 ip addresses

[FutherForward20]

Hello

I have two related questions if you could answer, I would be very grateful;

1) I am using Mod security as well as CSV on my Apache Centos server. I have been getting some IPV6 attacks and mod security is adding them to the mod security block just fine - but how can I manually add the offending IPV6 address into CSF? For example this one: 2a03:6f00:1::5c35:601e - when I try to add it I get the error: deny failed: [2a03:6f00:1::5c35:601e] is valid IPv6 but IPV6 is not enabled in csf.conf

Is there some instruction on best practice for enabling IPV6 in the conf ? I would like to understand the potential impacts. I googled it, but there is not much info I could find that was clear in terms of what config settings to use.

2) since modsec is in use and blocking some (abusive) IPs - is it necessary to also add these ips into CSF? This applies to both ipv4 and ipv6.

Thanks

[FutherForward20]

This is an old question - but has come up for me today.

An IPV6 Ip address is continually hitting my server and I want to slow it down. When I try to block it, I get

deny failed: [IPV6 address] is valid IPv6 but IPV6 is not enabled in csf.conf

So what's the best way to deal with this?