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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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4 Attachments

Contributor

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1 Message

6 years ago

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?

Tutor

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3 Messages

6 years ago

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. 

Tutor

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11 Messages

6 years ago

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?

 

 

Community Support

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232.3K Messages

6 years ago

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

Tutor

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11 Messages

6 years ago

 No other device connected to the router, basically it's the BGW210 -> Netgear R7000. I get the same two hops

 

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

 

Whether I go directly wired into the R7000 or via Wi-Fi on the R7000.

 

So I'm not sure if those two hops to a local IP are normal.

Community Support

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232.3K Messages

6 years ago

@blue2007,


 Thank you for the quick reply.  Please log into the BGW at http://192.168.1.254 and going to the device list to make sure the device is not getting a private IP.  Once this is complete, please log into the Netgear to check if it’s receiving a public IP. 


Please let me know.


Aaron, AT&T Community Specialist

Tutor

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11 Messages

6 years ago

Here is what's in the Device List, initially I saw a public and private, but did rescan and now it's only one. The R7009 is getting the public WAN IP. Is this right?

 

MAC AddressIPv4 Address / NameLast ActivityStatusAllocationConnection Type

remove for privacy
192.168.2.2 / uverse_DVR_ETH_removed for privacy
Fri Dec 29 16:13:58 2017
on
dhcp
Ethernet LAN-2

Contributor

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1 Message

6 years ago

i second the speed drop off with passthrough. Since last month, i have been experimenting with the BGW & the netgear R7000. The only way i can get close to 1 Gbps is if i let the BGW hand out the DHCP to all devices, no passthrough, no cascaded router, WIFI off & use the Netgear in an AP mode just for wireless. 

Any attempt at passthrough and all wired devices drop down to 200-250 Mbps max.

Community Support

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232.3K Messages

6 years ago

Greetings @blue2007,


You are absolutely correct; the R7009 should be getting the public WAN IP.  Forgive me for the late response; I was working with another DSL specialist regarding your concern to make sure nothing else was out of place.


Thank you again!


Aaron, AT&T Community Specialist

Tutor

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11 Messages

6 years ago

@ATTCaresBut should it still show two hops when you do tracert?

 

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

 

Doesn't that indicate Double NAT?

 

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