By default and in most cases, only one table - the one called "filter" - is actually configured. You can pretty much leave it as is unless or until you need to provide a service to other systems or, in other words, until your system needs to become a server.Īs the name implies, iptables is organized as a set of tables. Offspring of the earlier ipchains, iptables generally blocks network traffic that tries to reach services on your system. Iptables, more properly referred to as "iptables/netfilter" because of the two modules that are involved - the userspace module "iptables" and the kernel module "netfilter" - is the firewall that you'll find running by default on most Linux systems today.
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