How to put an AT&T NVG510 Router in Bridge Mode

I want to use my own Wireless Router instead of the NVG510 – Can I bypass the modem or put it into “bridge” mode?

Formally, the NVG510 does not seem to have a simple bridge mode configuration. Luckily, the nice people at the AT&T forum have found a workaround. Making it work requires configuring both the NVG510 and the router manually.

Here are the details:

On the NVG510:

1. Under “Home Network->Subnets & DHCP”:
- Device IPv4 Address: 192.168.1.254 (this is the default)
- DHCPv4 Start Address: 192.168.1.1
- DHCPv4 End Address:  192.168.1.1
(This tells the NVG510 to only allocate one address to a device connected to it)

2. Under “Home Network->Wireless”
- Wireless Operation: Off
(Since you will be using your own WiFi router)

3. Under “Firewall->IP Passthrough”
- Allocation Mode: Passthrough
- Passthrough Mode: DHCPS-fixed
- Passthrough Fixed MAC Address: <MAC address of the home router>
(You can find your home router MAC address on the home router’s status page.
Make sure to enter the WAN MAC address).

3. Under “Home Network->Configuration”, change IPv6 to “Off”, unless you know how to configure IPv6 to work with your router. This will save you some issues in the future.

On the Home Router

1. Make sure the home router allocates DHCP addresses on the LAN on a different range than 192.168.1.xxx. For example, 192.168.2.xxx will work (with a subnet mask of 255.255.255.0) or 10.0.0.1 will work (with a subnet mask of 255.255.0.0)2.

2. Tell the router to use a fixed WAN IP address (to not use DHCP to get an IP address from the NVG510). Then use the address from the NVG510 configuration page under “Broadband->Broadband IPv4 Address” as the WAN IP address, 255.255.0.0 as the subnet mask, the address under “Broadband->Gateway IPv4 Address” as the gateway address and the DNS server addresses from question #4 above as the primary and secondary addresses.

West Coast Note: from my experience, Google’s DNS servers (8.8.8.8 and 8.8.4.4) perform better in the SF Bay Area.
East Coast use 4.2.2.2 or 4.2.2.1

Everything worked great and then suddenly stopped, what happened?
AT&T may have turned on IPv6 on your line, and it messes up the “bridging” mode. To check this, look under “Broadband->Status”. If the IPv6 status is “Available”, this may be causing the issue.
The solution is to go to “Home Network->Configure”, and change the IPv6 option to “Off”. Then restart the NVG510 and router.

Article ID: 84, Created On: 12/6/2012, Modified: 10/3/2013

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