Chapter 4. NAT and Packet Mangling with iptables
In the first part of this chapter we will learn how to perform Network Address Translation (NAT) and Port Address Translation (PAT), also referred to as Network Address and Port Translation (NAPT), with iptables. After that, we will learn what packet mangling is and how to mangle packets.
A Short Introduction to NAT and PAT (NAPT)
According to the way TCP/IP works, in order for hosts to communicate on the Internet, each must have a unique IP address.
However, due to the shortage of public IP addresses available, it is necessary to use one IP address for many hosts using NAT.
Network Address Translation is a way to translate one IP address into another. This implies a NAT router (Linux in our case) that ...
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