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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 ssh 9 server 9 debian 9 redhat 8 ubuntu 7 hardening 7 centos 7 ipv6 6 fedora 6 fail2ban 5 csf 5 docker 4 rhel 4 selinux 4 router 4 nat 3 shorewall 3 netfilter 3 sshd 3 ferm 3 routing 3 harden 3 filter 3 IPv4 2 freebsd 2 service 2 services 2 pf 2