How do I route traffic of one IP net to a different router using DD-WRT

I am running DD-WRT v3.0-r28211 std (11/16/15) on a router behind my actual internet router (which is a Fritz!Box).

The Set up is a follows:

• Internet router: 192.168.177.1 (Fritz).
• DD-WRT: 192.168.0.1 connection to 192.168.177.1 through the WAN Port.
• Sitecome Router (VPNConnection): 192.168.0.2 connection to 192.168.0.1 through the WAN Port (PPTP connection is already established for that router).

Is it possible to have the DD-WRT set up with routing information that all regular traffic is sent to 192.168.177.1 and only traffic regarding the IP Net of 66.*.*.* is being routed through 192.168.0.2?

My assumtion was that I have to change the setup somehow that 192.168.0.2 connects through its WAN Port to 192.168.177.1 but also has a connection to 192.168.0.1.

Please be gentle with me I am still trying to dive into the depths of networking ;)

Thank you for your answers in advance, Cheers & Happy New Years everyone.

1 Answer

This is called static routing. You add a new manual route in the routers Routing Table. From the DD WRT manual:

Static Routing
A static route is a pre-determined pathway that network information must travel to reach a specific host or network.

To set up a static route between the router and another network:
Select a number from the Static Routing drop-down list. 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.

Depending on where the Destination IP Address is located, select LAN & WLAN or WAN from the Interface drop-down menu. Click the Apply button to save your changes. To cancel your unsaved changes, click the Cancel button. For additional static routes, repeat steps 1-4.

This is done from the Advanced Routing page.

In your specific case, the subnet is /8, or 255.0.0.0. Gateway would be the VPN ip 192.168.0.2

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