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Bridge-mode vs IP Pass-through - Info from the AT&T Community
Learn how to set up your own router
The Arris BGW210-700 BGW320 is an advanced residential gateway that supports VoIP, IPv6, video delivery, security firewall, and extensive remote management features.
The BGW210-700 Broadband Gateway delivers robust video, primary line telephony, and high-speed data over broadband networks via high-speed Internet connectivity.
The four Gigabit Ethernet ports can be separated into different services allowing the configuration of dedicated ports for data. It is designed for advanced DSL network service deployments and supports Quality of Service (QoS) and IP Passthrough.
Heads up: MAC Filtering has been disabled on the 5268AC. If you are in need of a modem that requires MAC Filtering, please reach out to us in the AT&T Community.
Determining the Business Need
You may need your gateway configured or placed into a Bridged Mode. The internet architecture does not allow for bride mode, but you can setup IP Passthrough, which should allow for most of the same things.
IP Passthrough means the AT&T supported CPE device terminates the DSL, authenticates with the network (Receives a WAN IP) and shares that IP address with a single device connected to the AT&T supported CPE equipment. This configuration is often times suitable for a business customer desiring to connect third party equipment to AT&T supported equipment. The IP Passthrough configuration still allows AT&T support groups to access the AT&T supported equipment while allowing end-users to connect third party equipment in a configuration they desire. The IP Passthrough configuration will only allow one connection to AT&T supported equipment to be "unfiltered" or pingable from the WAN or internet side of the AT&T equipment (does not support multiple pingable connections).
The IP Passthrough feature allows a single PC on the LAN to have the AT&T Gateway's public address assigned to it. It also provides port address translation (PAT) or network address and port translation (NAPT) via the same public IP address for all other hosts on the private LAN subnet.
Using IP Passthrough, the public WAN IP is used to provide IP address translation for private LAN computers. The public WAN IP is assigned and reused on a LAN computer.
Note: Remember to make a copy of all current IP settings before proceeding.
Configuring IP Passthrough
Run your Web browser application, such as Firefox and Chrome, from the computer connected to the Arris BGW210-700 and BGW320.
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Enter http://192.168.1.254 in the Location text box.
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Click the IP Passthrough tab and configure your settings.
Dynamic host configuration protocol (DHCP) address serving can automatically serve the WAN IP address to a LAN computer.
When DHCP is used for addressing the designated IP Passthrough computer, the acquired or configured WAN address is passed to DHCP, which will dynamically configure a single servable address subnet, and reserve the address for the configured PC's MAC address. This dynamic subnet configuration is based on the local and remote WAN address and subnet mask.
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The two DHCP modes assign the needed WAN IP information to the client automatically.
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You can select the MAC address of the computer you want to be the IP Passthrough client with fixed mode or with first-come-first-served dynamic. The first client to renew its address will be assigned the WAN IP.
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Manual mode is like statically configuring your connected computer. With Manual mode, you configure the TCP/IP Properties of the LAN client computer you want to be the IP Passthrough client. You then manually enter the WAN IP address, gateway address, and so on that matches the WAN IP address information of your AT&T device. This mode works the same as the DHCP modes. Unsolicited WAN traffic will get passed to this client. The client is still able to access the AT&T BGW210 device and other LAN clients on the 192.168.1.x network.
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DHCP Lease: By default, the IP Passthrough host's DHCP leases will be shortened to two minutes. This allows for timely updates of the host's IP address, which will be a private IP address before the WAN connection is established. After the WAN connection is established and has an address, the IP Passthrough host can renew its DHCP address binding to acquire the WAN IP address. You may alter this setting.
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Click Save. Changes take effect upon restart.
Note: IP Passthrough Restriction
Since both the BGW210 Internet Gateway and the IP Passthrough host use the same IP address, new sessions that conflict with existing sessions will be rejected by the BGW210. For example, suppose you are working from home using an IPSec tunnel from the router and from the IP Passthrough host. Both tunnels go to the same remote endpoint, such as the VPN access concentrator at your employer's office. In this case, the first one to start the IPSec traffic will be allowed; the second one from the WAN is indistinguishable and will fail.
Jared, AT&T Community Specialist
AT&T Help
Need help with an account specific question? Post a new question here on the forums by clicking the "Ask a Question" button.
For additional support, please visit us at our AT&T services hub.
*I am an AT&T employee, and the postings on this site are my own and don't necessarily represent AT&T's position, strategies or opinions.
gforkss
Contributor
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3 Messages
5 years ago
Hello - I have a router I would like to handle WAN traffic and provide the firewall (dhcp turned off) but I would like to have a server behind that as dhcp server and dns. This is not possible with the IP passthrough configuration. For all the people recommending IP pass through - it will not work. Is there an alternate way to set att modem in bridge mode?
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lshanermi
Tutor
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4 Messages
5 years ago
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gforkss
Contributor
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3 Messages
5 years ago
great, could you share a way to do this?
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lshanermi
Tutor
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4 Messages
5 years ago
IIRC I had to statically assign the IP, default route and netmask, because in pass through mode the GW doesn't offer the upstream IP to the one local device via DHCP.
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d3monkid12
Mentor
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78 Messages
5 years ago
Will this gateway work correctly with att 12 on adsl2+
Ive been having a lot of random disconnects and invalid ip packets and high packet loss
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mike11339
Contributor
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1 Message
5 years ago
I enabled IP Passthrough and now Im unable to connect to my office VPN. Is there some additional configuration Im missing?
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doc2485
Tutor
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4 Messages
5 years ago
I have spent the last 2 days trying to figure this out. Client has AT&T modem/router Arris BGW210-700 onsite with a Unifi USG3 behind it and all working fine. He purchased the static ip address too but still cannot get to see the ip Reolink cameras to be seen outside on the WAN???? The modem is set into pass thru mode, and all port forwarding setup in the cloud key controller. Whats so wierd when I am onsite and on the network, I can pull up the public WAN ip address fine with the cameras??? But outside the network, I cannot????
I have almost the same exact setup on another clients network but they use Spectrum with a modem only and it just works fine, no problem at all. It has to be something in that AT&T modem, a setting, something blocked??? I use this https://canyouseeme.org/
and the ports are not showing open for some reason???
AT&T modem is 192.168.2.254 and Unifi USG is 192.168.1.254 to keep from double NAT. All firewall settings are OFF in modem. I am at a loss on this one????
Any help or ideas to solve this? HELP????????????????????????????
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doc2485
Tutor
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4 Messages
5 years ago
This is figured out and now working!!!!! 1 number was wrong on gateway.
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MrTom44
Teacher
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9 Messages
4 years ago
I just installed a new router (192.168.1.2) at a business location, they have a BGW210-700 (192.168.2.254). The port forwarding in the modem was not working, every time I clicked ADD it just refreshed the page and never showed an added item. So I couldn't forward any ports through the modem, which is why I installed a new router.
I followed the instructions to set the modem into IP Passthrough mode DHCPS-Fixed, not very difficult at all. The Status page shows that it's in IP Passthrough mode. I verified and set the MAC to my router's internet port MAC address. My router's WAN is set to DHCP. But the router is getting a DHCP IP from the AT&T modem (192.168.2.70) instead of the Public IP that it should be getting. Now I'm doing a double NAT which seems to be functioning for internet okay. I've even tried rebooting both items and disabling DHCP in the modem.
At least now the firewall port forwarding in the BGW210 modem is working and allowing me to create some custom settings. I had to forward some ports from modem to my router, and create rules in my router to then forward the ports internally, which was necessary because the modem's firewall is still active and blocking incoming packets.
Why are the simple instructions not working for IP Passthrough? Enable IP Passthrough, select DHCPS-Fixed, select MAC of router in drop-down list, SAVE settings and reboot.
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doc2485
Tutor
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4 Messages
4 years ago
Here is how I do all the networks that have AT&T as ISP.... I set my Unifi router at 192.168.1.1 and change the AT&T modem to 192.168.2.254. You have to leave the dhcp server running on AT&T modem (which sux) but to make it work...I change scope too 192.168.2.2-.3 very small to keep it from getting out. I do the passthru just like you did then I use all the port forwarding only on the Unifi router. It works fine. I would REALLY rather have a modem only just like I do on all my Spectrum clients but AT&T will not allow it....sux again!!!!!!!!!!!!!!!!!!!!
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