can the arris bgw210-700be setup in a dual router config? I would like to use my dd-wrt router for a vpn behind it.

From what I heard on this forum, doesn't look like there will be any assistance from my isp. But on case you are feeling helpful. Here is the  thread topic. Pls keep it relavent or we may choose to mute you. 
Ahem. Thx.
I will have to post separately. However if you would like to help pls scroll to the thread topic.. Thx

Could you be more clear on what issues you're experiencing trying to set this up?

well , i can get into the routers gui to make changes. and into the arris same , but cannot for the life of me get internet out of router, and I have tried everything i have seen as far as suggestions, and some other s to try anything i thought was a possibility, , router is brand new . it reads that is has an internet connection, but I cannot get it working . I am almost positive it is the isp modem/router config. i am missing something .. above my knowledge (which is 100 percent commercial plumbing... lol ) i am trying tho... thx for the response 

Hey azelina27, we understand that you're having trouble getting your router setup behind your main router. We're here to help.

What you can do here is try using IP-Passthrough to connect your second router.

• Configuring IP Passthrough and DMZplus
• This will help with getting your connected in working.

Please let us know if that helps. 

Charles, AT&T Community Forums

@azeline27 ... seems to me you want to get the internet working through the ddwrt router before trying the vpn setup. I would not make any changes to the gateway and start with a reset on the ddwrt.

Could be a hardware problem. I've had a bad LAN port on a gateway. Bad ethernet cables... The router is new to you. Did you install ddwrt or buy it that way?

Are you using ethernet cable to access the gateway and ddwrt or connecting wireless?

Using a desktop/laptop or tablet/phone?

Is it a Netgear AC3200 router?

@ATTHelp  thank you, I have none of the models listed. you provided an arris 210-700.  

I have a ddwrt router, I want to do a dual router( one secured, one not)  set up. as described in the title. I wouldlike to know from att if this is possible to do with your modem/router (arris 210-700) . if not it would have to be a single router setup , me disabling the arris wifi radios and using my linksys. is that possible? 

I see alot of info but nothing in concrete for your "gateway" (arris) this is what I want... maybe i have not been clear enough, I apologize. THX for your time...

@JoeFW 

Hey Joe, thx for your response, I have an arris 210-700 provided by att, it is a combo, wifi/modem... I want a linksys 3200acm behind it, for a private network. i have posted pictures above a few times , but seems i am speaking greeek, I see info on it, nothing in concrete. for me. I want to know if it is possible with atts stronghold on the modem rental/gateway? to do the dual? and at this point if even a single router (my router) setup is possible, I have looked all over, i am missing the smallest of detail, straight dumb, or it isnt possible. again I apprediate the response. OH, also the router was purchased this way (new ) from a professional. 

THX!!

Hey azelina27, We understand what you're trying to do. The AT&T router will not allow that setup.

What you can do is use your secondary router, because trying that setup will result in a double NAT problem. You can use your personal router behind the AT&T router which will control all traffic with your connection using IP passthrough.

Charles, AT&T Community Specialist

I'm going to try to spell this out for you @azelina27 one final time. There seems to be a barrier between the level at which I can provide information and the level at which you are absorbing it.  And also irrelevant and conflicting information from ATTHelp, et al.

1) You should ensure that the LAN IP address of your router and the subnet it controls, is different from the Arris BGW 210 Gateway's.  If it is already not 192.168.1.*, then you can skip this step.  If you need to do this, refer to your Linksys' help materials for assistance.

2) You need to connect the WAN port of your router to a LAN port of the Gateway.

3) Connect your PC to a LAN port of the Gateway

4) Go to Firewall > IP Passthrough (on the Gateway at http://192.168.1.254 .  If you need the password, it's on the sticker on the side of the Gateway)

5) Change Allocation mode to Passthrough

6) Set Passthrough Mode to DHCP-Fixed

7) Select your Linksys router from the dropdown for Passthrough Fixed MAC address.

8) Click Save

9) Remove power from your Gateway and your Router.

10) Plug in the Gateway and let it boot up

11) Plug in the Router and let it boot up

12) Connect your PC to your router, and check its WAN IP address.  If it's a Public IP, proceed.  If it's 192.168.1.xxx, then unplug it for 5 minutes, and plug it back in and retry this step.

13) Once the above is working, you should be able to go to http://192.168.1.254/ while connected to your router.  If this works (and it should), then try going to an internet site.  If that works (and it should), configure your SSID and passphrase on your Linksys.  Connected back to the Gateway at http://192.168.1.254/ and turn off Wi-Fi on the Gateway.

Once all that is working, test it out for a few days.  If you want to proceed with VPN setup, after a brief test out period, then you should be able to follow any instructions for your Linksys router that exist.