Good day list,
Most System Admin's, myself included, prefer IPV4 because it's a lot of what 
most provider's support, plus tracking down machine's that utilize IPV4 tends 
to be less stress on us.
As far as IPV6 masks, they come in the form of letter:number:lettter:number, so 
banning them can be quite difficult, if not next to impossible, in certain 
situations.
I do both Network and server administration and have been doing so for at least 
10 to 15 year's, and I can say that by using either IPTables and/or Fail2ban, 
they both have strength's and weaknesses, though if it were me, I like fail2ban 
myself. As IPTables gets the job done, it's rarely updated at least on CentOS, 
while Fail2ban happens to be updated quite a bit more often. On cPanel 
server's, especially, Fail2ban ties into IP tables while also providing it's 
own level of protection which I find to be nice.
If I had a client server I, too, could pull a fail2ban config file, but I don't 
have access right now to a server.

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