Advanced Routing with WRT120N

Question

Hi there.
A few months ago I configured my former router (WRT54G2) for a OpenVPN. I forwarded the port 1194 and in Advanced Routing I used to have this configuration:
Route Name: openVPN
Destination LAN IP: 192.168.10.0
Subnet Mask: 255.255.255.128
Default Gateway: 192.168.1.106  (this is the Server OpenVPN IP)
Interface: LAN & Wireless
Everything was working like a charm. Because the WRT54G2 became damaged, I bought a WRT120N and I'm trying to achieve the same for my OpenVPN. But, I'm having problems in Advanced Routing section. Now I see some different options (NAT, RIP). Leaving those options with their default values, I enter the data for the Static Route (posted above) and I'm getting the error "Destination LAN IP is not valid", and doing combinations of NAT and RIP options brings the same error.
Do someone know which would be the equivalent configuration (as posted above) but for WRT120N?
I really appreciate your help.
Kind regards.

Answer 1

Choose the correct working mode for NAT. Keep the default setting, Enabled, if the Router is hosting your network's connection to the Internet (Enabled mode is recommended for most users). Select Disabled if the Router exists on a network with other routers.
Dynamic Routing (RIP): This feature is not available with NAT enabled.
Dynamic Routing enables the Router to automatically adjust to physical changes in the network's layout and exchange routing tables with other routers. The Router determines the network packets' route based on the fewest number of hops between the source and destination.  
1. To set up a static route between the Router and another network, select a number from the Static Routing drop-down list. (A static route is a pre-determined pathway that network information must travel to reach a specific host or network.)
2. Enter the following data:
Destination IP Address - The Destination IP Address is the address of the network or host to which you want to assign a static route.
Subnet Mask - The Subnet Mask determines which portion of an IP address is the network portion, and which portion is the host portion.
Gateway - This is the IP address of the gateway device that allows for contact between the Router and the network or host.
3. Depending on where the Destination IP Address is located, select LAN & Wireless or Internet(WAN) from the Interface drop-down menu.
4. To save your changes, click the Save Settings button. To cancel your unsaved changes, click the Cancel Changes button.
Click the Show Routing Table button to view all of the valid route entries in use. The Destination IP address, Subnet Mask, Gateway, and Interface will be displayed for each entry.