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DI-308 ISDN Remote Router
58
192.168.100.2
192.168.100.3
192.168.100.5
192.168.100.4
192.168.100.1
Single
Global
IP Address
176.220.22.1
LAN
LAN
Port
Local IP
ISDN
Port
WAN
Router
NAT
Translator
Please note that in the above diagram, the Gateway IP address settings for the local
PC’s needs to be set to 192.168.100.1, the LAN IP address of the router.
NAT manipulates the IP addresses in packet headers on a one-to-one basis. An
outgoing data packet (a packet originating from a computer on the local LAN and
destined for a computer outside the private network) will have its IP address
translated as shown below.
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.