The iptables package contains iptables, iptables-restore, iptables-save, ip6tables and some libraries. iptables is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. These are used to save and to restore your elaborated 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 core functionality of iptables.