D-Link DSL-504 Product Manual - Page 23

Setting Local IP Addresses, Port Redirection, Source IP address, Destination IP Address

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DSL-504 ADSL Router User's Guide Please note that in the above diagram, the Gateway IP address settings for the local PC's needs to be set to 192.168.0.1, 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 carried 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 carried by the packet, in this case, web page contents. Setting Local IP Addresses When implementing NAT and thus creating a private network that is isolated from the Internet, you can assign any IP addresses to host computers without problems. However, the Internet Assigned Numbers Authority (IANA) has reserved the following three blocks of IP Addresses specifically for private networks: Class Beginning Address Ending Address A 10.0.0.0 10.255.255.255 B 172.16.0.0 172.31.255.255 C 192.168.0.0 192.168.255.255 It is recommended that you choose local IP addresses for use with NAT from the private network IP addresses in the above list. For more information on address assignment, refer to RFC 1597, Address Allocation for Private Internets and RFC 1466, Guidelines for Management of IP Address Space. Port Redirection 17

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DSL-504 ADSL Router User’s Guide
17
Please note that in the above diagram, the Gateway IP address settings for the
local PC’s needs to be set to 192.168.0.1, 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 carried 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 carried by the packet, in this case, web page contents.
Setting Local IP Addresses
When implementing NAT and thus creating a private network that is isolated
from the Internet, you can assign any IP addresses to host computers without
problems. However, the Internet Assigned Numbers Authority (IANA) has
reserved the following three blocks of IP Addresses specifically for private
networks:
Class
Beginning Address
Ending Address
A
10.0.0.0
10.255.255.255
B
172.16.0.0
172.31.255.255
C
192.168.0.0
192.168.255.255
It is recommended that you choose local IP addresses for use with NAT from the
private network IP addresses in the above list. For more information on address
assignment, refer to RFC 1597,
Address Allocation for Private Internets
and RFC
1466,
Guidelines for Management of IP Address Space
.
Port Redirection