Setting up a SonicWall with a DSL connection

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cdubks88

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Jan 27, 2014
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I'm needing to know if this can be done or if a SonicWall will work with this type of setup. I have a friend who has DSL service from AT&T (it's the best provider in our town of all options), but they have a Motorola gateway device. From everything I've seen, I should be able to bridge the motorola, but it's kind of a funky way of doing it in that it involves setting the VPN passthrough and using a private static ip for a wan IP on the device sitting behind that gateway device.

What I'm wondering is can you setup a SonicWall's wan ip as a private class on a different subnet than ip that would be used for the gateway? As far as I've seen, it's the only way to get this thing bridged so you can truly pass through to a router/firewall.

The device is a motorola nvg510. I was looking at a SonicWall TZ105.

Thanks!

C.
 
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choucove

choucove

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May 13, 2011
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At my office I have a similar setup with an AT&T DSL modem. I don't think my device is the exact same as yours, but the features or options should be the same.

With the AT&T modem, there should be an option to operate in Bridged or Pass-Through mode. For my modem, this option was simply listed as, "Where do you want the PPPoE to authenticate?" Then there are two options, 1) on this modem, or 2) on a device or computer behind this modem. I selected the second option, which then also requires a reboot of the modem. It's important to note that once you set this option, the only way to access the modem again is to connect directly to it with an ethernet cable and use the default IP address to login to the management interface.

Now onto the Sonicwall. The easiest way to set this up is to use the setup wizard which walks you through creating your network interfaces and zones. You can select the option to input a PPPoE username and password for your WAN interface at this window, and go through setting up all your other options. If you have already set up your Sonicwall, you can just go into the Interfaces section and modify the settings for your WAN interface X1. Set the option to PPPoE and provide the PPPoE username and password from AT&T. Ensure that you have the option set for Obtain IP Address Automatically.
 
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cdubks88

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Jan 27, 2014
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10,510


Just to be clear, are you using private addressing for the wan ip on the SonicWall?

As far as I know, I should be able to do what you're suggesting in the bridging piece, but I'll have to make sure and get his PPPoE details.

What I'm essentially trying to do is have him be able to connect via Global VPN client externally by pointing at his static IP and once connected to the SonicWall, have access to any machines on the subnet (which will end up being different from the wan IP subnet even though it looks like it's going to have to be private class).

Can this be done?

Thanks again!

C.
 
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choucove

choucove

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Basically with bridging you are eliminating a separate WAN network in your configuration. The outside IP address of your WAN interface on your Sonicwall after completing this will be the IP address provided by your ISP (whether that is static or dynamic) but will not be a private network range. For a VPN connection to a Sonicwall device this is ideal.
 
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