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fail2ban now supports ipv6 (#2015) 

Since fail2ban 0.10.0, ipv6 support has been added. The current Ubuntu 18.04 repository has fail2ban 0.10.2, which does have ipv6 protection.
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@ -69,8 +69,6 @@ The following services are protected: SSH, IMAP (dovecot), SMTP submission (post
Some other services running on the box may be missing fail2ban filters. Some other services running on the box may be missing fail2ban filters.
`fail2ban` only blocks IPv4 addresses, however. If the box has a public IPv6 address, it is not protected from these attacks.
Outbound Mail Outbound Mail
------------- -------------