ATTHelpForums's profile
Community Support

Community Support

 • 

2.7K Messages

Friday, October 20th, 2017 5:34 PM

Closed

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. 

  • Enter http://192.168.1.254 in the Location text box. 

  • 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.

 

  • The two DHCP modes assign the needed WAN IP information to the client automatically.

    • 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.

     

  • 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.

  • 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. 

  • 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.

Still need help? Ask a question! Our 1.4 million members typically respond within 1 hour.

4 Attachments

Mentor

 • 

27 Messages

6 years ago

Wow, did you mean a pfsense SG-1000 <-- or a 100? I cant say I've even heard of the 100. If you do have a 100, I'd venture a guess that there are only 10/100 ports & not gig ports...which begs the question, why you are even seeing 150mb.  The other thing you might do is contact ATT for tech support, this one might just be your hardware though.

Tutor

 • 

2 Messages

6 years ago

SG-1000 is their latest architecture - ARM based mini pfsense. https://www.netgate.com/products/sg-1000.html

Contributor

 • 

1 Message

6 years ago

Hello I am a newbie to att internet. PLEASE HELP! I have the 1000mps fiber optic service and have the BGW210 and want to use my own router which is the TP-LINK OnHub by Google. Have read so many post and I am not familiar with technical computer verbiage. Can some one hold my hand and walk me through a step by step process to do this???

Contributor

 • 

2 Messages

6 years ago

For some reason I cannot change the options under Passthrough - unable to select DHCPS-Fixed or other. Everything is grayed out after changing over to Passthrough mode. I am trying to use as little features of the Modem/Gateway as possible and delegate everything to my router.

 

What am I missing? Why are the options under Passthrough grayed out/unable to be changed?

 

EDIT: Am using the Fiber 1000 package with an Arris BGW210.

Mentor

 • 

27 Messages

6 years ago

I had the same issue, the resolution is in this thread. Do a, factory reset
of the att modem & you should then be able to make the changes.

Contributor

 • 

1 Message

6 years ago

Ravi, thank you for your help 

Contributor

 • 

2 Messages

6 years ago

Yeah - I saw your message shortly after posting but decided to leave my question due to the way google tends to work for people down the road. I missed your answer on the first pass through. I did the factory reset and noticed that it worked, but when I went back to disable DHCP it broke it again so I guess re-enabling DHCP is all that was necessary.

Contributor

 • 

1 Message

6 years ago

Hi, I am trying to configure my Arris BGW210-700 to assign a separate static IP address than my Arris BGW210-700 (not ip passthrough) to my secondary router and then allow all traffic to passthrough to my secondary router (Home Lab Environment).  My problem is that I get this working just fine but the Arris BGW210-700 is having its NAT Table Sessions fill, and then I need to reset the sessions to restore any internet connectivity to both my Arris BGW210-700 and my secondary router.  Any ideas on how to work around this?  

Tutor

 • 

5 Messages

6 years ago

The AT&T support guy told me that when you use Passthrough mode the modem will split the speed between the connected devices: your router gets a portion, the Arris wireless gets a portion and other devices get a portion.  2 devices each gets half.  3 devices each gets a third.  You have to disable the wireless on the Arris modem to get that speed redirected to the router.

ACE - Expert

 • 

34.3K Messages

6 years ago


@bobznkazoo wrote:

The AT&T support guy told me that when you use Passthrough mode the modem will split the speed between the connected devices: your router gets a portion, the Arris wireless gets a portion and other devices get a portion.  2 devices each gets half.  3 devices each gets a third.  You have to disable the wireless on the Arris modem to get that speed redirected to the router.


This is incorrect information.  When you use Passthrough mode, unsolicited traffic is forwarded to the device you setup for it.  When that device requests an IP address via DHCP, it is given the dynamic public address that the Gateway has received.  Passthrough does not form any hard traffic partitions.  It doesn't change any QoS formulas.

 

Not finding what you're looking for?
New to AT&T Community?
New to the AT&T Community? Start by visiting the Community How-To.
New to the AT&T Community?
Visit the Community How-To.