On most Linux systems, iptables is installed as /usr/sbin/iptables and documented in its man pages, which can be opened using man iptables when installed. Iptables requires elevated privileges to operate and must be executed by user root, otherwise it fails to function. Different kernel modules and programs are currently used for different protocols iptables applies to IPv4, ip6tables to IPv6, arptables to ARP, and ebtables to Ethernet frames. The filters are organized in different tables, which contain chains of rules for how to treat network traffic packets. ![]() Iptables is a user-space utility program that allows a system administrator to configure the IP packet filter rules of the Linux kernel firewall, implemented as different Netfilter modules.
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