Community Support
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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.
MrTom44
Teacher
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9 Messages
4 years ago
But does your Unifi router get the proper public IP? Because if it's not then there's no use to even enable IP Passthrough. I could have easily just plugged a cable into my router's WAN port and have it instantly working. But I require some port forwarding and it wasn't working in the modem which led me to set the modem in IP Passthrough.
It's working for me now, internet works and I have a double port forward which is working to the internet LAN. But it's just not optimum and IP Passthrough is not working correctly.
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doc2485
Tutor
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4 Messages
4 years ago
Yes it sure does. Shows public WAN ip address like it supposed too in the settings page. They do have a static WAN ip address also. I had to put that into the Unifi router also.
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MrTom44
Teacher
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9 Messages
4 years ago
Well their IP is non-static at the moment, so I'd rather not hard code any static WAN IP in there if I could. When I get a chance to go back to the location I'll experiment with DHCPS-Dynamic. They also have an extra AT&T 4-line VoIP box plugged in that I'll have to reroute to the router and hope that still works. Thanks for your input.
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browndk26
ACE - Professor
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5.8K Messages
4 years ago
@MrTom44
Change the router lan ip to .2.1. Leave the gateway on its default lan ip. That should eliminate double nat.
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sunriser
New Member
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1 Message
4 years ago
I managed to setup the ATT router as an IP-Passthrough modem to my pfsense router.
However, when I disable DHCP on the ATT, our pfsense wont get any IP anymore and is not working.
So far we have DHCP running on ATT and DHCP running on our pfsense Router, giving some issues/conflicts when having dhcp configured devices, switching the IPs between the ATT router and PFsense.
Any idea whats wrong here? Again, when we enable DHCP on the ATT router, it works fine and the Pfsense router does show the Public IP on the WAN Ip.
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Productguy
New Member
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2 Messages
4 years ago
I've tried so many of these posts but nothing is working for me. I have a Gryphon router plugged in with IP Passthrough turned on and can't get anything more than 93 Mbps from it even though I'm on the gigabit plan. I'm just a product manager and not a network expert and I shouldn't have to be a network expert trying to decipher what a WAN IP is verses a gateway IP vs a LAN IP. I still don't understand it all, but I do understand this is a really broken process and I still don't have internet speeds that I'm paying for.
I called AT&T and was told that I'd need to forward ports in my router and I should call the manufacturer. Is that for real? I'm supposed to have to forward some ports in my router so the ATT modem doesn't choke the connection? I'd love any help anybody could provide me. This whole process has been kind of ridiculous.
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Mfahmed
Contributor
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4 Messages
4 years ago
**** Issue has been fixed. Scroll at through the end ****
Hello ,
I read about 5 pages of this post , I still couldn't get this working. In short i want to have ASUS AC1900 router between ATT modem BGW210 and home network. I did the following:
However I am not able to connect to internet when hardwired to ASUS router or on Wifi. What am i missing here? Please advice. This is driving me nuts.
*************************************************
I was able to resolve this. Not sure which one actually fixed it but I had to update the software on Asus router and change DHCP lease on ATT router to 1 day, my hunch is software update on ASUS fixed this.
(edited)
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julerobb1
New Member
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108 Messages
3 years ago
Im trying to set up a c7000/AC1900 netgear router but cant make seem to get it to be assigned IP by CPE. Etc.
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clarkcox3
Contributor
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2 Messages
3 years ago
This doesn't seem to be working on my BGW210-700.
- I've disabled WiFi
- I've disabled all options under "Firewall Advanced"
- The only device attached to the gateway is the router that I want to get the publicly routable IP
- I've enabled IP Passthrough
- I've tried DHSPS-fixed (and I've verified that I have the correct MAC address)
- I've tried DHSPS-dynamic (this should work as well, as there is only the one device connected to the gateway)
However, DHCP is still handing out a private IP address (192.168.1.87) to my router, instead of the publicly routable address, and connections from the outside cannot be made. What do I need to do to make IP Passthrough work as advertised?
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nabril15
Tutor
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41 Messages
3 years ago
@clarcox3
This is how my BGW is set up.
I have it as 192.168.1.1 and my linksys router directly connected to it as 192.168.2.1.
WIFI - only enabled the 2.4 ghz network so that I can get to it for maintenance.
DHCP - Enabled, and not sure why. All of my devices get their IP from the linksys dhcp in the 192.168.2 network.
IP Passthrough - the mode is Passthrough, and it is set to DHCPS-Fixed pointing to the mac address of that linksys router. For some reason, the lease is set to 98 days and 10 minutes. I think that I read that in a post above as a solution to force the router to renew, or something like that.
Naturally, the wiring is important as outlined in posts above, but with these settings, it should work.
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