The iptables-package contains iptables, ip6tables, and some libraries. is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. to save and to restore your elabourated set of chains and rules. Until iptables-1.2.5 they were declared experimental. This is the same as iptables but for use with IPv6. As of v1.2.5, it is not as complete as the standard IPv4 version, especially with regard to some of the modules. These are various modules (implemented as dynamic libraries) which extend the the core functionality of iptables.