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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.
strkfitron15
Employee
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8 Messages
7 years ago
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dunnjo
Mentor
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27 Messages
7 years ago
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strkfitron15
Employee
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8 Messages
7 years ago
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BeInYourSenses
Tutor
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3 Messages
7 years ago
I got passthrough to work but the speeds drop from about 930 mbps to about 250 mbps.
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strkfitron15
Employee
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8 Messages
7 years ago
I'm experiencing the same issue.
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dunnjo
Mentor
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27 Messages
7 years ago
Interesting, i'm not having that issue. What are you using to test your speeds? AT&T's internal tool? Have you turned off all the firewall features, etc on the ATT modem? Mine is only doing pass-through and DHCP for 4 IPs in the event i want to plug directly in the modem to manage it (rare). Whatever device you are behind the ATT modem, is it a router or firewall? Do you have URL filtering turned on or other layer 7 type filtering or DPI, etc? These things would slow you down as well. I'm on conference call (video) for work at the moment and I checked my speeds...I am pushing 500mb at the moment. My wife is home watching a movie on a firestick as well...interested in hearing your responses.
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BeInYourSenses
Tutor
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3 Messages
7 years ago
In my old home, I have an older PACE ATT Modem, On that modem I had to set
the DHCP range to just have one IP address and then I set the Netgear
R6300v2 (flashed with DD-WRT) to a static IP that was the same as the DHCP
range, so no one else could acquire that IP. The AT&T Modem was connected
to a LAN port on the back of the Netgear Router, this was the only way I
was able to get Bridging to work. I managed to get 900+ mpbs on my lan,
with this setup. The Netgear never acquired a public IP and I was ok with
this, since it met my needs.
In my new home, I have a BGW210 AT&T Modem. I used the same Netgear R6300v2
and this time connected the BGW210 to the WAN port on the back of the
Netgear Router. I set the BGW210 to IP Passthrough, to try and get the
Netgear to acquire a public IP, which it did. However now the dilemma of
the slower speeds at the Router/LAN. When it attempted to do the same setup
as my old home, I managed to get back to the 900+ mbps on the LAN, but now
no public IP. I would like to use IP Pass through and get a public IP on
the netgear if at all possible with the 900+ mbps on the LAN.
To answer your questions
What are you using to test your speeds? = Speedtest.net.
Have you turned off all the firewall features, etc on the ATT modem? - I
did this and it didnt seem to impact the speeds one way or the other (with
both types of setups that I tried, above)
Mine is only doing pass-through and DHCP for 4 IPs in the event i want to
plug directly in the modem to manage it (rare). Whatever device you are
behind the ATT modem, is it a router or firewall? - It is a Router -
Netgear R6300v2 (flashed with DD-WRT)
Do you have URL filtering turned on or other layer 7 type filtering or DPI,
etc? - No content filtering on the Modem, but I do have some URI filtering
on the Router (I did at my old home too, and it didnt affect the speeds to
any noticeable amount, maybe 5 to 10 mbps slower, same now)
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dunnjo
Mentor
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27 Messages
7 years ago
What is the WAN port speed on your router? Does it support 1gb? Silly question, perhaps but yours be surprised. Is it set at duplex 1g (hard coded) or auto speed & duplex auto? When you plug directly into the att modem, are you getting gig speeds? Does plugging the att modem in directly to a LAN port on the router gives you higher speeds? If so I feel like there's something up with that WAN port. Let me know...
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BeInYourSenses
Tutor
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3 Messages
7 years ago
All ports on the router are gigabit (LAN and WAN).
All ports (LAN and WAN) appear to be set at Full Speed, Full Duplex and Gigabit, from what I can see in the DD-WRT interface. Auto-Negotiate is also turned on.
Plugging my laptop directly to the modem gives me 900+ up and down.
Plugging the Att modem to the LAN port of the router gives me 900+ up and about 400 down. At this point it sort of behaves like a bridged network by not aquiting a public IP.
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bweav74
Tutor
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2 Messages
7 years ago
I'm having the same issue with the speed dropping off considerably with IP passthrough. I turned off all firewall etc. I am using a pfsense SG-100 so it might not do quite 1gb but it should do far better than the 150 Mbps I'm seeing.
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