Manual Trendnet TW-H6W1IR (page 87 of 165) (English)

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TW-H6W1IR ISDN Remote Router

Configuration and Management 79

In the Outgoing Data Packet above, the Source IP address is the IP

address that is translated by NAT. The Destination IP Address is the

IP address of a computer outside the private network, on the Internet

for example. And the Data portion of the packet is the information

payload borne by the packet, for instance a request to view a web

page.

The router logs the changes made to the IP header in its NAT table.

The NAT table enables the router to send replies back to the local

computer as shown below.

In the Inbound Data Packet above, the Destination IP Address is the

IP address that is translated by NAT. The Source IP Address is the IP

address of a computer outside the private network. And the Data

portion of the packet is the information payload borne by the packet,

for example, the contents of a web page.

The actual information in the NAT table depends whether the router is

implementing NAT or NAPT.

It is also of interest to note that this translation process provides a level

of security to your network found in a firewall. If you examine the

outbound and inbound packets above closely, you can see that the

computer outside of the network that is receiving the packet and

sending the response only knows about the global IP address used by

the router, and actually sends the response to that address. The outside

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Trendnet TW-H6W1IR Manual

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