IP filtering and network address translation
IP filtering and network address translation (NAT) act like a firewall to protect your internal network from intruders.
IP filtering lets you control what IP traffic will be allowed into and out of your network. Basically, it protects your network by filtering packets according to the rules that you define. NAT, allows you to hide your unregistered private IP addresses behind a set of registered IP addresses. This helps to protect your internal network from the outside networks. NAT also helps to alleviate the IP address depletion problem, because many private addresses can be represented by a small set of registered addresses.
In addition to the information in this topic, use the online help available from the Packet Rules Editor in IBM® Navigator for i. The IBM Navigator for i online help offers tips and techniques for making the most of the packet rules, including How do I help, Tell me about help, and extensive context-sensitive help.