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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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Responses

Dallasvr

Contributor

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2 Messages

6 years ago

Just installed fiber (1000 gig) internet in Dallas. New gateway used is BGW 210. Was told this will probably be the main router used for future installs. Don't get nearly as good range/coverage as I did with older Pace 5268AC and copper line. I do get 950mb speed up and down when connected to the new router but wifi signal strength measured in -db falls off very quickly to lost connection within 30 feet. I've tried various router placements within my 2 story home with the idea that placed as central and as high would be optimal. Still no sweet spot to achieve workable signal strength. One question is what kind of WiFi protocol does it use (b/g/n/ac) and does it employ MU-MIMO technology? It's hard to know what I'm dealing with with no documentation or user guide. All that said I think I'd like to set this router up in pass through mode and try an ASUS RT5300 router to improve the range. I have read some posts directed at this but could you detail it out specifically for the technically challenged ike myself. I would like to connect some devices directly to the BGW Ethernet ports but pass all WiFi functions off to the ASUS. Is this possible and how do I set this up. Your help would be most appreciated.

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mikestone65

Contributor

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2 Messages

6 years ago

I'm also having some trouble with the cascaded router option. Can you detail the exact ip addresses you used?

My Arris BGW210 is set at 192.168.0.1 / 255.255.255.0

What should I plug into my router? It's set at 192.168.1.1 / 255.255.255.0, but that definitely won't work.

I tried changing the router to 255.255.254.0 or a 10.x IP address, but no luck.

Apparently, I don't understand subnetting.

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rreddy

Tutor

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7 Messages

6 years ago

Hi,

You will need to set the cascade option only if you plan to have another router along with the ATT router as your main DHCP. But if you want the ATT router to act as just a model and not a DHCP and instead want your personal router to be your DHCP then you would need to set the passthrough option under Firewall | IP Passthrough | allocation mode set to passthrough | Passthrough mode set to fixed and from the drop down you would select the router name or enter the MAC ID of your router.

I hope this helps.

Regards,

R

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dunnjo

Mentor

•

27 Messages

6 years ago

You do not need the cascaded router option for any reason. Just turn it off & follow my previous instructions. Those of you asking about the scope used, that has no bearing. You can use whatever scope you want. Ip pass-through is all u need. Set your routers Mac address on that screen & you're all good. The public IP that would normally be the WAN interface of the att modem will now be assigned to the interface of your firewall /router that is plugged into your att modem. Turn on DHCP on the att modem regardless of whether you'll use DHCP on the att router or not. You'll need it. Use a different scope for your LAN IPs DHCP scope.

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mikestone65

Contributor

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2 Messages

6 years ago

Thanks, I'll give it another try next weekend. One problem I kept having after I gave up on the Cascaded Router option, was that my personal router kept fussing that the WAN and LAN addresses 'overlapped.' Not sure what that meant either.

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dunnjo

Mentor

•

27 Messages

6 years ago

Overlapped means you're using conflicting IP addresses but that should NOT happen so you're definitely doing something wrong. The WAN IP that is "pass-through" the ATT modem is PUBLIC (which is why it's used on the Internet). Unless your LAN IP address scope is public, which it should NOT be, that shouldn't be an issue. Use 192.168.1.100/24 or some other private IP space on the LAN side. On your router's WAN port (the one that connects to the LAN port on the ATT modem/router) should be configured as a DHCP-client that it will receive the public WAN IP that is passed-through to it. Hope this helps.

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rreddy

Tutor

•

7 Messages

6 years ago

Hi,

I am guessing you get this error on the router - the WAN port on the router would be a LAN IP address of the DHCP coming from ATT router. Make sure the LAN on your router is not the same as the LAN on your ATT router. For example the default IP address on the ATT is 192.168.1.x - and the default IP address on your router may be the same. change that to 192.168.2.x and that should resolve this issue.

I hope this helps.

Regards,

R

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bphagan

Contributor

•

1 Message

6 years ago

I just had ATT internet installed and wanted to put the BGW210 into passthrough mode.

I already have an Apple TimeCapsule that has all my port forwarding and IP reservations setup.

I am switching from Comcast.

I followed all the steps numerous times and could not get the TC to see the outside internet.

I finally found a solution but not sure if it will continue to work.

I changed pass-through to ON

I changed to DHCPS Fixed and entered the TC ethernet mac address.

I left the DHCP Server setting to defaults since my TC network uses a different subnet than the default so they don't conflict.

What I had to do differently is the following:

In the TC Internet settings, I had it set to DHCP to get the external IP and router.

This worked fine on the Comcast setup.

But would not work for ATT setup.

I changed it to Static and manually typed in the IP address I see in the BGW210 settings.

I typed the same address with a .1 on the end for router.

I now have outside connection!!

My concern is if ATT changes my IP address, I will need to change the TC address to match.

How do I access the BGW210 on a different subnet from my computer?

Currently I plug a laptop directly into the BGW210 in order to access the configurations.

bdog

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dunnjo

Mentor

•

27 Messages

6 years ago

That's not going to work if they change your ip. Make sure the port you've
plugged into the TC from your Att Modem is setup as a DHCP client.

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HANS0L0

Contributor

•

1 Message

6 years ago

I gave up on trying to use 'Cascaded Router'.

I just disabled all wifi and set ip passthrough to DHCPS-fixed for my Asus router to be the wireless for the house.

I left everything else on the Arris modem/router the same (DHCP server etc). I am using all wired connections directly off of the Arris as I am getting much better speed than off of my Asus router.

Anyone with more knowledge than me see any problems (security or otherwise) with this?

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Bridge-mode vs IP Pass-through - Info from the AT&T Community