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I want to set up a home VPN, and I had planned to use DD-WRT to do it. The problem is that our current router isn't supported by DD-WRT. Our previous router is supported by DD-WRT, and I have already installed the firmware on that router. The problem is that for a few reasons, we need to use the router that doesn't support DD-WRT as our primary router. What I'm wondering is: is it possible to set up a DD-WRT router as an access point on an existing network not run by a DD-WRT router, and then still use that router to set up a home VPN?

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closed as not a real question by techie007, Simon Sheehan, 8088, ChrisF, Nifle Nov 25 '12 at 18:06

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Yes. Just make sure to do these things:

  1. Disable WAN support in the DD-WRT router. Either configure it to bridge the WAN port to its LAN (converting it into another LAN port) or don't use the WAN/Internet port.

  2. Connect a LAN port on one router to a LAN port on the other.

  3. Disable the DHCP server in the DD-WRT router.

  4. Configure the DD-WRT router's LAN IP to a valid IP inside the subnet, ideally one outside the other router's DHCP range. Set its default gateway to the IP address of the other router.

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For the last step: "Set its default gateway to the IP address of the other router", do you mean the local ip address, or the outside ip address? –  CodeJunkie Nov 26 '12 at 2:24
    
@CodeJunkie: The local IP address. Your default gateway has to be on the same network as you, otherwise you'd need a gateway to reach it, and then that would be your default gateway. –  David Schwartz Nov 26 '12 at 3:08
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