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.
kkm5848
Voyager
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4 Messages
5 years ago
I have followed all the instructions here and still had no luck. I ordered AT&T 300MBPS connection and see roughly half that when doing a speed test with the AT&T modem. However, when hooking up my Linksys 1900ACV2 (running DDWRT vs : DD-WRT v3.0-r33375 std (09/19/17), I only get approx 94Mb/s as per the DDWRT speed-test service.
On my AT&T ARRIS BGW210-700 w/ Firmware 1.9.16, I have turned off all firewall services, all IPv6 settings and turned on IP Passthrough using DHCPS-fixed and tied to the mac address of my Linksys.
My subnet on the Linksys remains 192.168.1.1 but I changed the BGW210-700 IPv4 address to 172.16.1.1 and set the DHCPv4 settings to match on the device.
I still have wifi enabled on the BGW210-700 (since that is how I am connecting to this router for configuring it) but other than my phone (which I am only using for configuring the router) the only other device connecting to it is my Linksys router.
On the Linksys side w/ DDWRT, I am using Connection Type: "Automatic configuration - DHCP" , Advanced Routing: Operating Mode = Gateway, QOS is disabled.
Speed test on the BGW210-700 (under Diagnostics:Speed Test: 388 Mbps) while Speedtest on DDWRT: 94 Mbps.
Please help!
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AMrWest
Contributor
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2 Messages
5 years ago
I use the IP Passthrough feature and have configured all my settings. It works very well! However, one issue I need some guidance on. I need to forward a port 12345 from the Internet to my LAN. The traffic is not passing through to my EdgeRouter. I run port scans on my AT&T WAN IP Address and all ports all are shown as closed. I have disabled all Firewall options on the AT&T Gateway. All Firewall filtering is performed on the EdgeRouter. Does anyone have some ideas?
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crazyspeed
Contributor
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3 Messages
5 years ago
I have Netgear Orbi router and I followed the instructions in this thread to set up IP passthrough for my Arris BGW210. It worked and I can keep using my Orbi as the main router.
However, almost everyday devices connected to my Orbi router reports loss of Internet connection once or twice. It lasts about one minute and connection will restore by itself. Devices connected directly to the BGW210 are not affected. Any ideas?
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dinkoh
Contributor
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2 Messages
5 years ago
Any luck finding a solution. I have the same issue as you.
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dinkoh
Contributor
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2 Messages
5 years ago
Any luck on fixing this issue. I'm having the same problem with ~500 download speeds as well. I don't understand why.
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crazyspeed
Contributor
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3 Messages
5 years ago
still wish the router mode can work with ATT fiber.
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scopiques
Contributor
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1 Message
5 years ago
I just enabled the passthrough option and plugged in my netgear to one of the lan ports. I am able to use lan ports on both the ATT modem and my netgear. Not complaining because it works, I just didn't expect the modem lan ports to still be functioning as well. Both wifi radios work also.
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rickdo357
Contributor
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1 Message
5 years ago
This works awesome with my eero, a BGW 210-700 fiber network, just had the 300 mb plan installed from a spectrum 100/10 plan...
1 - logged in to the BGW 210-700 on my Mac (PC will work too) plugged directly in to the ATT router
2 - disabled wifi; 5ghz and 2.4g bands
3 - plugged in my Eero router (let the eero "wake up")
4- went to Firewall--> IP Passthrough on the BGW 210
5 - changed the "allocation mode" to Passthrough
6 - put the "Passthrough Mode" to DHCPS - Fixed
7 - passthrough Fixed MAC address - Choose the eero from the drop down list (re #3)
8 - set the "Passthrough DHCP Lease" to 1 day
9 - restarted both the BGW 210 and eero - BOOM!
10 - it EFIN works!
11 - My wifi speed went from about 33mb down and 33mb up on the ATT wifi to 300mb + up and 275mb + up on the eero! (on iPhone, iPad, Mac, PC and a fire tablet
12 - don't own a eero get one, you will not regret it. Period
(edited)
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crazyspeed
Contributor
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3 Messages
5 years ago
Any reason for doing this? This is the only setting that I don't have in my pass-through setting where I have the intermittent loss of connections.
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JefferMC
ACE - Expert
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35.5K Messages
5 years ago
It means the negotiation between your router and the gateway would only happen once per day instead of much more frequently). If your router has trouble processing the response to the renew lease request it sent to the gateway (many routers do, due to an interesting interpretation of the DHCP specifications), then every lease renewal cycle will result in a brief disconnection.
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