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How to setup IP Passthrough / Bridge Mode on Motorola NVG510 AT&T UVerse DSL Modem

Recently, my parents upgraded from AT&T’s old ADSL, to the new “UVerse” ADSL2+. With it came a new Motorola NVG510 UVerse all-in-one router / wireless access point / ADSL2+ modem combo. In my opinion, it’s routing and wireless abilities are total crap. Long ago I installed a Linksys WRT54G router that has been flashed with DD-WRT. This allows bandwidth monitoring, proper port forwarding, and also gives me the ability to connect via VPN remotely to help them out with problems on rare occasion. After their new Motorola UVerse modem was installed, my first order of business was to strip it of all routing and wireless functions, and make it just a router. On the old Novatel modems, this was called IP Passthrough, and pretty easy to set up. Now it’s changed and can take a little finesse to set up.

How to enable IP Passthrough on the Motorola NVG510 UVerse Gateway

I assume you already have a router to connect you NVG510 to. Go ahead and connect the routers WAN port to one of the LAN ports on the UVerse modem. You will need the MAC address of the WAN port on your router. You can usually find this on a sticker on the bottom of the unit. I’m going to pretend mine is AB:CD:EF:GH:IJ:KM for the scope of this article.

The router you are adding needs to have a LAN address that is not on the 192.168.1.x subnet. If you absolutely must have your router on that subnet, you can change the IP/subnet of the NVG510. If you need help with that, post in the comments and I would be glad to lend a hand.

With you computer connect to one of the LAN ports on the NVG510, navigate to the configuration page. By default it is You will see this page:


Now, click on the Firewall tab, then select IP Passthrough. You will need the password on the sticker, on the side of the NVG510 itself to login, unless you’ve already changed it.


Change the Allocation Mode to “Passthrough.”

The Default Server Internal Address should be set to whatever the temporary WAN IP address the NVG510 assigned to your router. After this is all done, your router will obtain your actual Public IP address, so don’t worry.

Passthrough Mode needs to be “DHCPS-fixed.” This tells the NVG510 to hand out your public IP to your router.

Passthrough Fixed MAC Address needs to be the MAC Address of the WAN port of your router (should be a sticker on the bottom of it) with colons used to separate each group, so it should be in this format: AB:CD:EF:HI:JK:LM

You can leave the DHCP Lease time set to defaults, or change it. It should matter either way.

Once you are finished, I would suggest disabling the UVerse Wireless on the NVG510 as that should now be handled by your router. To do this, select the Home Network tab and then select “Wireless.” Change Wireless Operation to “Off.”

Screen Shot 2015-05-02 at 6.47.13 PM

Now would be a good time to restart your UVerse DSL modem, and then restart your router after the modem has had a minute to boot up. If your mac address was entered properly, you should now be getting a WAN (Public) IP Address assigned to your router and the NVG510 will be in modem mode.

If you get stuck, feel free to ask for help. Good luck!

12 thoughts on “How to setup IP Passthrough / Bridge Mode on Motorola NVG510 AT&T UVerse DSL Modem

  1. TW says:

    I have the nvg510 and the wifi range sucks. What would be the best router for range. Also I can’t access the nvg510 login page with my desktop for some reason when it use to. I have to access it with a tablet or iphone.


  2. Todd Champion says:

    I will be adding an Asus RT-AC66U router to the nvg510. How do I set the LAN address of the router different from the nvg510. I could use any help you can give.

    Thanks for your help

    • m-slovak79 says:

      I know this is a bit late to reply to you but… read my other post in here a moment ago as that will pretty much tell you what to do as while you can adjust the router to and have the NVG510 on (which is what the NVG510 is by default but your primary router is likely not as my guess is most routers use by default which will conflict with the NVG510), it’s overall better to adjust the NVG510 to the address initially as it will make things easier for you in the future should you have to hard reset the main router you want to use for routing your general internet connections because if you ever have to reset your primary router, assuming it uses by default, it will establish a connection nice and easy where as if you leave the NVG510 as is, and change your primary router you want to use to another IP address (say etc) and reset your router in the future you will have to reconfigure more stuff to get it working again. it’s just wiser to adjust the NVG510 so it makes the primary router less stuff to adjust and will work by default from a clean reset state.

  3. Mike Smith says:

    The NVG510 will not have a lan address if you follow the tutorial and put it into passthrough mode. You will still be able to access it using it’s default IP address, but it will only be on the WAN side and not the LAN side. It takes care of the routing tables to make that possible. You should only have your Asus router plugged into one of the ports on the NVG. The NVG should not be plugged into any other ports. Make sense?

  4. Miguel says:

    Hi I need to change the Ip of the Motorola, i’ll try to use as a brinding model with a Netgear to expand my signal

  5. David Jenkins says:

    My CPE router will located quite a distance from the NVG[589], and I will be using its subnet to access some IP cameras remotely. However, it would be troublesome to recable the stuff that’s currently going into the NVG LAN ports. Is there any reason they can’t continue to be plugged into the NVG ports? Will those devices be lacking internet access after the Passthrough is implemented?

  6. heyyu says:

    I’m also at my parents house trying to help them out with their home internet service. They have the exact setup as you described above. I purchased a new Linksys wireless router for them. It was working fine but the only other factor is that they have a VoIP service called Magicjack. It is connected directly via phone line to the NV510 modem. After changing the modem to pass through the MagicJack no longer works. I assume it’s because it needs an IP address to work properly. When I switch the modem back to non passthrough, the Magicjack works again. Suggestions on how I can set the modem to both passthrough and have the Magicjack still work?

    • Mike Smith says:

      You need to set up the linksys/att for passthrough.. make sure the linksys is pulling a public IP address, then power cycle the majic jack so it pulls a new IP from the linksys. It will work fine in this setup. My parents have majicjack too. Thanks!

  7. m-slovak79 says:

    basically if your main router you want to use has a IP of to access the device, which many seem to, you basically need to first set the NVG510 to under ‘Home Network > Subnets & DHCP’ with your computer connected to it on one of the LAN ports of the NVG510. I put Subnet Mask to and DHCPv4 Start Address to and End Address to etc. then once this is applied and you reboot the NVG510, disconnect your computer from the NVG510, and now you can connect the router you want to use to route all of your general traffic (I use a ASUS WL-520GU running Tomato v1.28.1815 firmware) from the WAN port on the router you want to use to the LAN port on the NVG510 and you should now be able to access the NVG510 through your primary router on address and to access the router your using should be accessible on but generally speaking at this point you should not really need to access the NVG510 page much anymore and will do all of your configuring on the router you want to use for your general internet access which is at I prefer doing things this way because initially it’s somewhat of a pain but once your done it’s easier in the future in case you ever hard reset your primary router you will still have immediate access to the general internet through the NVG510 (basically like the NVG510 is not even there).

    but with that said… thanks for the article as it worked well.

  8. David says:

    If you’re running a dual WAN router, you may have to add a static route in that router to reach the NVG510’s web page on 192.168.0.x, if your primary router is on 192.168.1.x subnet. I’m using the Linksys LRT224 with ISP service from Comcast and Frontier, to had to add a static route as follows:

    Destination IP :
    Subnet Mask :
    Default Gateway: the NVG510’s public IP address (yeah this is the only thing that worked)
    Hop Count (Metric, max. is 15) : 2
    Interface : WAN2 (the AT&T / Frontier connection in my case. Comcast is on WAN1)

    Hope that helps someone, and if anybody has a better way, please comment.

  9. Jackie Liu says:

    on the passthrough fixed mac address is it my at&t modem/router or is it the other brand router mac address that i should enter to the At&t modem/router

  10. Michael Schweickert says:

    When I do the I do the pass through part, it don’t give me a temporary IP address, nor gives me the option to type one in


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