IPTables
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List
iptables -L
Add
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
Replace (append)
iptables -R INPUT 1 -p tcp -s 192.168.0.0/24 --dport 80 -j ACCEPT
Delete
iptables -D INPUT 5
== Delete all (flush)
iptables -F
Actually save changes
iptables-save > iptables.dump
CentOS: iptables-save | sudo tee /etc/sysconfig/iptables
Ubuntu: sudo /sbin/iptables-save
Red Hat/CentOS: /sbin/service iptables save or /etc/init.d/iptables save