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Understanding Netopia NAT Behavior C-7
the Internet.
If the address range of 192.168.X.X is not used and another range of addresses such as 100.1.1.X is used instead, this address space can potentially overlap an address space that is owned by a user attached to the Internet. Thus if a user on the Netopia R5000 Series Router’s LAN interface has an IP address of 100.1.1.2 while the Netopia R5000 Series Router’s LAN interface is 100.1.1.2 and the local host wants to access a host on the Internet with the address of 100.1.1.8, the Netopia R5000 Series Router has no way of knowing that the 200.1.1.8 address is actually on the Internet and not on its local LAN interface, since the local LAN interface is assigned the IP address range of 200.1.1.1 to 200.1.1.14.
Configuration
NAT is enabled by default with the SmartStart configuration utility. You can toggle Enable Address Translation to No or Yes in the Connection Profile screen in System Configuration under the IP Profile Parameters section. NAT is enabled on a
IP Profile Parameters
Remote IP Address: | 127.0.0.2 |
Remote IP Mask: | 255.255.255.0 |
Address Translation Enabled: | Yes |
Filter Set... |
|
Remove Filter Set |
|
Receive RIP: | No |
Enter the remote IP network's IP address (form xxx.xxx.xxx.xxx decimal).
Configure IP requirements for a remote network connection here.
Toggling Address Translation Enabled to Yes enables the Netopia R5000 Series Router to send out an
As mentioned earlier in this appendix, NAT works well for IP sessions originated on the Netopia R5000 Series Router’s LAN interface destined for the Internet without any additional configuration. For incoming IP connections from the Internet to a host on the Netopia R5000 Series Router’s LAN interface, exported services need to be used.
Exported services are configured under IP Setup in System Configuration. This is where a particular type of TCP or UDP service originating from the Internet is redirected to a host on the Netopia R5000 Series Router’s LAN interface. An example of this screen follows: