Configuring IP Passthrough and DMZplus

This configuration is often suitable for a customer desiring to connect third party equipment for networking, such as a router, to the AT&T provided gateway. IP Passthrough is also commonly used as an alternative to using a bridged mode.
Note the following before configuring passthrough mode:

• Only one device can be put into passthrough mode.
• Placing a device in passthrough mode will remove firewall protection provided by the AT&T gateway.
• When a device is configured in passthrough mode, it will be assigned a WAN IP instead of a LAN IP. Other devices connected to your gateway may no longer be able to share files with the device in passthrough mode.

You will first need to locate your AT&T equipment to determine if you have a Motorola or 2Wire/Pace device. Then connect a PC directly to the AT&T gateway with Ethernet and follow the instructions below.

Motorola NVG 510 and 589
The Motorola RG can be configured in three ways to pass the DHCP WAN IP address to a device on the LAN.

• DHCPS-dynamic: The public WAN IP address is delivered by the AT&T provided RG's DHCP server to the first device that requests a DHCP address on the LAN.
• DHCPS-fixed: The public WAN IP address is delivered by the device's DHCP server to the device whose MAC address has been specified.
• Manual: A LAN device must be manually configured with the AT&T provided device's assigned WAN IP address and gateway information. To use this method, you will need to contact Customer Care to obtain your Wan IP Address, default gateway, and subnet mask.

DHCPS-dynamic

1. Open a browser on a computer that is directly connected to the gateway.
2. In the address bar, enter http://192.168.1.254.
3. Select the Firewall tab in the RG GUI page.
4. Select IP Passthrough below the Firewall tab.
5. Enter the Device Access Code if prompted.
6. Select the Passthrough option from the Allocation Mode drop-down menu.
7. Select DHCPS-dynamic from the Passthrough Mode drop-down.
8. Select Save. A re-starting gateway reminder message appears.
9. Select Restart Now to complete the setting change.
10. Refresh the network connection on the device that is to be set up to receive the public IP address. Typically this can be done with a power cycle of the device.

Note: The device you are putting into passthrough mode must be configured to obtain an IP address through DHCP for the DHCP-dynamic option to work. If the gateway is reset using this mode, the first device that makes a DHCP request will be put into passthrough mode. If you plan to have more than one device connected directly to the ATT gateway, then using DHCP-fixed option is recommended.

DHCPS-fixed

1. Open a browser on a computer that is directly connected to the RG.
2. In the address bar, enter http://192.168.1.254.
3. Select the Firewall tab in the RG GUI page.
4. Select IP Passthrough below the Firewall tab.
5. Enter the Device Access Code if prompted.
6. Select the Passthrough option from the Allocation Mode drop-down menu.
7. Select DHCPS-fixed from the Passthrough Mode drop-down.
8. Enter the MAC address of the device that is to be set up to receive the public IP address in the Passthrough Fixed MAC Address field.
9. Select Save. A re-starting gateway reminder message appears.
10. Select Restart Now to complete the setting change.
11. Refresh the network connection on the device that is to be set up to receive the public IP address. Typically this can be done with a power cycle of the device.

Note: The device you are putting into passthrough mode must be configured to obtain an IP address through DHCP for the DHCP-fixed option to work.