Advanced Firewall Configurations with ipset

“iptables is the user-space tool for configuring firewall rules
in the Linux kernel. It is actually a part of the larger netfilter
framework. Perhaps because iptables is the most visible part of the
netfilter framework, the framework is commonly referred to
collectively as iptables. iptables has been the Linux firewall
solution since the 2.4 kernel.

ipset is an extension to iptables that allows you to create
firewall rules that match entire “sets” of addresses at once.

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