iptables: iptables (IP packet filter administration) iptables: iptables: iptables is a packet filter administration tool for Linux 2.4, iptables: replacing the ipchains tool that was used with the 2.2 kernel. The iptables: iptables tool is used to set up, maintain, and inspect the tables of iptables: IP packet filter rules in the Linux kernel for packet filtering, iptables: firewalling, and NAT (Network Address Translation). iptables: iptables: If you plan to set up a firewall with Linux 2.4, you'll need this. iptables: iptables: