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Apache IPv6 Configuration: Dual Stacked IPv4 & IPv6 Virtual Hosts

How do I configure Apache IPv6 networking under a UNIX / Linux / BSD operating system? How do I configure httpd IPv6 and IPv4 under a RHEL / CentOS / Fedora / Debian / Ubuntu Linux?
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BSD PF Firewall Block FTP Bruteforce Attacks

I see lots of failed FTP login attempts in my log file. How do I stop FTP bruteforce attack? What should I do to solve this problem under FreeBSD 7.x server operating systems?
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PF Firewall Open FTP Port 21 (PASSIVE Configuration)

Question: I've vsftpd ftp server configured under FreeBSD 7.x and PF firewall. Both PF and FTP server running on a dedicated FreeBSD web server. How do I configure PASSIVE FTP PF firewall configuration so that my vsftpd work? How do I configure PF firewall to protect an FTP server and open port 21?
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