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What is netfilter/iptables?
What is.netfilter/iptables?
netfilter and iptables are building blocks of a framework inside the Linux 2.4.x and 2.6.x kernel. This framework enables packet filtering, network address [and port] translation (NA[P]T) and other packet mangling. It is the re-designed and heavily improved suclearcase/" target="_blank" >ccessor of the previous Linux 2.2.x ipchains and Linux 2.0.x ipfwadm systems.
netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the network stack.
iptables is a generic table structure for the definition of rulesets. Each rule within an IP table consists of a number of classifiers (iptables matches) and one connected action (iptables target).
netfilter, iptables and the connection tracking as well as the NAT subsystem together build the whole framework.
