Iptables Concepts

Internal

• iptables

netfilter, iptables tool, iptables service and firewalld

netfilter

netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. A registered callback function is then called for every packet that traverses the respective hook.

iptables

iptables is a Linux userspace command line tool that manipulates the IPv4 network packet filtering rules.

ip6tables

ip6tables is the equivalent command line tool that manipulates the IPv6 network packet filtering rules.