Describe the following terms that are used in the iptables command:

1. Chain
2. Postrouting
3. Prerouting


1. A chain is a list of rules which can match a set of packets. Each rule specifies what to do with a packet that matches. Each table specifying a set of rules is constituted of several such chains which can be either built-in chains or user-defined chains.
2. This is an example of the built-in chains provided in the netfilter infrastructure. The rules in this chain are applied to datagrams that are going to the public network. The main rule is SNAT, which specifies how the source address of an outgoing IP datagram should be modified. All future packets in the connection also get mangled in a similar way.
3. This is another example of one of the built-in chains provided in the netfilter infrastructure on Linux system. The rules in this chain are applied to datagrams coming from the public network.

Computer Science & Information Technology

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