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firewall 205 system 86 security 80 iptables 65 firewalld 54 networking 53 ufw 33 network 25 tcp 19 linux 16 nftables 11 opnsense 10 server 9 debian 9 ssh 9 redhat 8 hardening 7 centos 7 ubuntu 7 fedora 6 ipv6 6 fail2ban 5 csf 5 rhel 4 docker 4 selinux 4 router 4 harden 3 filter 3 nat 3 shorewall 3 netfilter 3 sshd 3 ferm 3 routing 3 hetzner 2 gaia 2 locale 2 ntp 2 sysctl 2