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Friday, October 20th, 2017 5:34 PM

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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. 

  • 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

 

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*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.

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4 Attachments

Employee

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8 Messages

7 years ago

Ravi, thank you for your help...had a question though. Step 4, how did you go about setting a fixed IP for your router? I see no option to do that on the BGW210.

Mentor

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27 Messages

7 years ago

I'm not sure who Ravi is, but I can answer. What fixed IP in your router are you referring too, the WAN (can't be fixed as it's DHCP client from Att) or LAN, you set that yourself for whatever subnet you want to use.

Tutor

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7 Messages

7 years ago

Hi,

 

The way i setup a fixed IP for my router is before setting up an IP passthrough in DHCP mode on the ATT router - disable the wifi networks / and with only the router connected to the att router go to home network | Ip allocation and you should be able to click on 'Allocate' and change the ip address if you want. I hope this helps?

 

Regards,

Ravi

Mentor

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27 Messages

7 years ago

If you're talking about the LAN IP of the router and you want it to be 'static' then why not do it on the router itself?  The DHCP on the ATT modem has to be on for pass-through to work. I only have a 4 client scope on there because i'm paranoid and dont want more than that but it is NOT giving out any IP addresses and why should it?  It just makes things more complex & difficult to troubleshoot in my opinion. Once you decide on the internal LAN subnet you want to use, put that in the ATT modem and leave it.  Statically assign your LAN router and define your DHCP subnet on your router as well and eliminate the need to use the ATT modem except for required functionality.

Employee

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8 Messages

7 years ago

Thank you.

Employee

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8 Messages

7 years ago

Still can't get cascading to work. My netgear ac1900 IP is 10.0.0.X but the Arris won't accept it...any ideas? 

Employee

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8 Messages

7 years ago

Still can't get cascading router to work. The IP on my netgear nighthawk is 10.0.0.x but the Arris won't accept that IP...any ideas?

ACE - Expert

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35.8K Messages

7 years ago


@strkfitron15 wrote:

Still can't get cascading router to work. The IP on my netgear nighthawk is 10.0.0.x but the Arris won't accept that IP...any ideas?


@strkfitron15, uou cannot give an IP address anywhere in the 10.0.0.0/8 block to an piece of AT&T gear anymore; they've reserved it for their own use.  Now you could use that block for your own purposes behind your Nighthawk, but you can't tell the U-verse Gateway about it.


What are you trying to accomplish?

 

Employee

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8 Messages

7 years ago

My objective is to have the Arris function solely as a modem and have the router functionality on the nighthawk.

ACE - Expert

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35.8K Messages

7 years ago

Is there some reason you are not using IP Passthrough?

 

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