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Re: Strict NAT? Bridge Mode? What is IP Passthrough? Can I enable on my Arris BGW210 or like router?

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Strict NAT? Bridge Mode? What is IP Passthrough? Can I enable on my Arris BGW210 or like router?

BGW210backColor.pngBGW210frontColor.png

 

The Arris BGW210-700 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.

 

Determining the Business Need

Business customers sometimes state that they need DSL/Broadband CPE that can be configure or placed into a Bridged Mode where they are putting other CPE behind the DSL/Broadband CPE. Many times, these customers can be better served with a configuration known as IP Passthrough. The below information explains the difference between IP Passthrough vs Bridged mode and provides instructions on how to configure the Arris BGW210-700 Internet Gateway for IP Passthrough.

 

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:BGW_IP_Passthrough_Screen.jpg

Run your Web browser application, such as Firefox and Chrome, from the computer connected to the Arris BGW210-700.

 

 

  • 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.

IP Passthrough Mode.jpg

 

  • 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.

 

If you need further assistance with your IP Passthrough setup and configuration contact ConnecTech Support.

 

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.
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Message 67 of 176
Mentor

Re: Arris BGW210-700 Passthrough mode

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.

Message 60 of 176
Tutor

Re: Arris BGW210-700 Passthrough mode

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

Message 61 of 176
Contributor

Re: Arris BGW210-700 Passthrough mode

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???
Message 62 of 176
Contributor

Re: Arris BGW210-700 Passthrough mode

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.

Message 63 of 176
Mentor

Re: Arris BGW210-700 Passthrough mode

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.
Message 64 of 176
Contributor

Re: Arris BGW210-700 Passthrough mode

Ravi, thank you for your help 

Message 65 of 176
Contributor

Re: Arris BGW210-700 Passthrough mode

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.

Message 66 of 176
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Accepted by ATTHelpForums
‎10-20-2017 10:40 AM

Re: Strict NAT? Bridge Mode? What is IP Passthrough? Can I enable on my Arris BGW210 or like router?

See above to learn how to setup and configure IP Passthrough mode for your router.

 

If you need further assistance with your IP Passthrough setup and configuration contact ConnecTech Support.

 

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.
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Message 68 of 176
Contributor

Re: Strict NAT? Bridge Mode? What is IP Passthrough? Can I enable on my Arris BGW210 or like router?

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?  

Message 69 of 176

Re: Arris BGW210-700 Passthrough mode

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.

Message 70 of 176
ACE - Expert

Re: Arris BGW210-700 Passthrough mode


@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.

 

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*I am not an AT&T employee, and the views and opinions expressed on this forum are purely my own. Any product claim, statistic, quote, or other representation about a product or service should be verified with the manufacturer, provider, or party.
Message 71 of 176
Contributor

Re: Arris BGW210-700 Passthrough mode

I'm using the IP Passthrough feature using DHCPS-Fixed on the BGW210 with my Linksys EA9500 router. I'm on AT&T 1GB internet service. I'm pulling 900+ wired, but am only getting 150-300/mb wireless. While this is not a huge concern, I am wondering if there might be a setting that I can tweak to get faster wireless. Hardware that I'm testing from is not the issue. I've tried disabling packet filtering on the 210, but that didn't affect speeds that I could tell. I've read a lot on this forum about people disabling all firewall settings on the 210. Does this mean disabling packet filtering AND turning off all features in the Firewall Advanced settings? Right now everything in firewall settings on the BGW210 is turned on to the factory settings. I did not adjust anything from my Linksys EA9500 after setting up the IP passthrough.

 

What (if anything) can I do to possibly get faster wireless speeds?

Message 72 of 176
Tutor

Re: Arris BGW210-700 Passthrough mode

Thanks, Daaron.

 

I had a TPLINK C7 router.  Followed your lead, things didn't work until I entered in DNS.  Since my BGW210 did not have any DNS settings, I just used goggle ones, 8.8.8.8 and 8.8.4.4

Getting roughly same speeds on my C7 wireless as my BGW210 so must decide whether to turn off BGW210 or not. 

 

My main incentive to use own router was I had security cameras with static IP which I didn't want to change.  Also wanted to use VPN features of C7 not available on BGW210.  BTW, I had contacted AT&t technical support and he gave totally useless information to the problem of using my own router with their own device with little documentation. 

Message 73 of 176
Tutor

Re: Arris BGW210-700 Passthrough mode

Here is how I setup mine, but not sure if it's correct.

 

1. IP Passthrough on the BGW210, WiFi OFF, Cascade OFF, DCHP ON, changed ip to range 192.168.2.1 and gateway 192.168.2.254

 

2. On the Netgear R8000, I put WAN on automatic IP from ISP, same for DNS, and left the range at 192.168.1.1

 

Now when I run a traceroute to check for Double NAT, here is what I'm seeing, 2 hops from two local IPs.

 

traceroute to 8.8.8.8 (8.8.8.8), 64 hops max, 52 byte packets
 1  192.168.1.1 (192.168.1.1)  0.724 ms  0.383 ms  0.255 ms
 2  dsldevice.attlocal.net (192.168.2.254)  0.503 ms  0.436 ms  0.438 ms
 3  108-247-247-1.lightspeed.cicril.sbcglobal.net (108.247.247.1)  2.451 ms  2.899 ms  1.430 ms

 

Am I doing something wrong? Did I miss something?

 

 

Message 74 of 176
Administrator

Re: Re: Arris BGW210-700 Passthrough mode

Greetings @blue2007,


Thank you very much for reaching out to us on the Community Forums.  I understand you are experiencing some difficulty in setting up your router for pass-through.  I would be more than happy to assist you. 


From the information which you provided, do you currently have another device connected to the router?  If you could please send us a private message to @ATTCares with your name, contact number, and additional information I would appreciate it. 


Hope to hear from you soon.


Aaron, 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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