D-Link DFL-260E User Manual for DFL-260E - Page 366
A NAT Example
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7.2. NAT Chapter 7. Address Translation 3. The recipient server then processes the packet and sends its response. 195.55.66.77:80 => 195.11.22.33:32789 4. NetDefendOS receives the packet and compares it to its list of open connections. Once it finds the connection in question, it restores the original address and forwards the packet. 195.55.66.77:80 => 192.168.1.5:1038 5. The original sender now receives the response. The sequence of these events is illustrated further in the diagram below. Figure 7.2. A NAT Example Example 7.1. Specifying a NAT Rule To following will add a NAT rule that will perform address translation for all HTTP traffic originating from the internal network lan as it flows out to the public Internet on the wan interface. The IP address of the wan interface will be used as the NATing address for all connections. Command-Line Interface First, change the current category to be the main IP rule set: gw-world:/> cc IPRuleSet main Now, create the IP rule: gw-world:/main> add IPRule Action=NAT SourceInterface=lan SourceNetwork=lannet DestinationInterface=wan DestinationNetwork=all-nets Service=http Name=NAT_HTTP NATAction=UseInterfaceAddress Return to the top level: 366