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Installing Vonage behind a Firewall

Added on by Ray Insalaco.
This is a quick discription of the steps that I had to go through to get my VoIP router working from behind my firewall. The Vonage router does include a firewall, however it was not as tuneable as the firewall that I already had install.

Lets start with my current hardware configuration:

  • NetGear FVS318 ProSafe VPN Firewall - 10.0.0.1

  • File Server - 10.0.0.25

  • Print Server - 10.0.0.26

  • Computers - 10.0.0.50 - 10.0.0.75

  • Linksys - RT31P2 VoIP router from Vonage


I do connect to the VPN from remote locations, so that had to be the first thing after the cable modem. So here are the steps to get this working, hopefully.

  1. Disconnect the RT31P2 from your modem.

  2. Connect to your FVS318.

  3. Access the FVS318 and get the DNS server setting from the status page.

  4. Now we need to allow some ports through the firewall. Create the following rules:

    1. Forward UDP 5060..5061 to 10.0.0.250

    2. Forward UDP 123 to 10.0.0.250

    3. Forward UDP 69 to 10.0.0.250

    4. Forward UDP 10000 .. 20000 to 10.0.0.250



  5. Disconnect from the FVS318.

  6. Connect one of the three network ports on the RT31P2.

  7. Open a browser and login to the RT31P2. The address at this point should be 192.168.15.1.

  8. On the setup tab, change the connection type to STATIC IP.

  9. Enter the following information for the static ip address:

    1. IP Address: 10.0.0.250

    2. Subnet Mask: 255.255.255.0

    3. Default Gateway: 10.0.0.1

    4. DNS 1: from FVS318

    5. DNS 2: from FVS318

    6. DNS 3: 10.0.0.1



  10. Click save and close your browser.

  11. Disconnect from the RT31P2

  12. Connect to the FVS318

  13. Connect the cable that came with the RT31P2 from the FVS318 to the Internet port on the RT31P2.


You should be able to make calls at this point. If not you may have to shut down the modem, FVS318 and RT31P2. When you start them back up, bring up the modem, then the FVS318 and then the RT31P2. After doing this you will not be able to login to the RT31P2 without connecting your computer to the RT31P2, but once it is up and working there is no real need.

Good Luck ...