What you will want to do is turn DHCP back on your Linksys router since you want it to hand out IP address for your whole network. Another benefit to having your Linksys act as DHCP is that you can specify your own preference for DNS servers and be able to use UPnP.

So I would suggest you reset your Linksys to factory defaults to make things easy. Then you will want to run a cable from any one of the LAN ports on the RG to the Internet port on the Linksys.

Then follow this guide to turn the RG into a sudo "bridge" mode.
http://forums.att.com/t5/Residential-Gateway/U-verse-for-BUSINESS-2Wire-3600HGV-bridge-mode-or-anoth...

Once you have got everything setup I turned off the wireless on my RG since I wasn't going to be using it at all and I didn't want there to be any interference problems between wifi on the RG and my router.

I also installed a separate wireless/ethernet router behind the RG.  But it certainly was not very complicated.  All our TV's continue to be fed directly from the RG.....two via coax and one via ethernet.  Then I connected the new router to one of the unused ethernet ports on the RG.  Turned off the wireless in the RG.  I also connected my desktop to one of the ethernet ports on the new router.  Fired it up and now our two laptops and two iPads are all functioning just great wirelessly.  My desktop is also functioning just fine and all the PC's can see each other and interact on the home net.  Other than turning off the wireless in the 3801 RG I made no other changes in settings.

 

At this point I should add:  You've noticed that the RG is 2.4 gHz G wireless only.  My new wireless router is a dual band Netgear N600

and for all the wireless in the house we are using the 5 gHz N capability.

 

I should also mention that the Netgear N600 Dual Band router also has a USB port which can be used for two or three different purposes.  In our case I have my 1 TB external HDD connected to it and that gives all three PC's continuous access to this HDD.  Previously this HDD was connected to my desktop and it had to be turned on in order for the laptops to see this external drive.  That is no longer the case.

I thought that I read that the RG had to be the DHCP server because of the way Uverse handles the TV portion of the stream. That's why I turned the DHCP off on the Linksys, as there can only be one DHCP server.  

 

If I have that wrong, how do you turn off the RG's DHCP?

 

thanks,

 

Bob

Xbob,

 

You have basically two configuration choices for your new device:

1) As a Router

2) As an Access Point

 

If you configure it as a router, then you leave its DHCP feature on, connect it to the RG via its WAN port and have it create a second subnet (often 192.168.2.*).  It then routes traffic out of its little subnet to the rest of the world, providing NAT, etc.  This does allow things like custom DNS servers, UPNP (if you really want that), custom Firewall, etc..  The RG continues to offer DCHP to those devices connecting directly to it (e.g. the TV receivers), you cannot turn this off and still have TV service.

 

If you connect it as an access point, then you turn the DHCP feature OFF on your device, connect it to the RG using one of the LAN ports.  Then it acts as a switch/wireless access point, allowing the RG to provide all of the router services (including DHCP).  

 

There are two excelent posts by SomeJoe giving step by steps on how to do each of these.  I don't have a link to them handy at the moment, but if you are unable to find them via search, post back and I'll look for them.

 

Doesn't leaving the DHCP NAT on on the second router give you a double NAT error? or does changing the subnet fix this problem? I could really use the help.

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dubmann wrote:

Doesn't leaving the DHCP NAT on on the second router give you a double NAT error? or does changing the subnet fix this problem? I could really use the help.

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I don't know what you mean by "double NAT error."  Yes,  you would change the subnet on the router behind the RG.  Assuming that your router allowed you to turn NAT off, I'm not sure that it or the RG would properly route traffic from the 192.168.1.xxx subnet to your router's subnet.  With NAT on, the traffic from behind that router appears to be coming from the router and will be properly routed.  Yes, any traffic from that router would be NATed again if it passes through the RG to the Intenet, but that's not an "error" per se.

 

 

This applies to both 2Wire modem models, I presume. The 3600HGV uses 192.168.1.X subnet, and the N600 uses 10.0.0.X subnet by default. The N600 is set to 192.168.1.1 by default, which falls within the modem's DHCP subnet range. These factors make the setup easier - they snap together with minimal configuration due to their default settings.

 

1. Connect the N600's yellow "Internet" port to one of the unused ethernet ports on the 3600HGV.
2. Turned off wireless on the 3600HGV.  
3. Connect a PC to one of the ethernet ports on the N600 (router, aka Netgear WNDR3700).
4. Other than turning off the wireless in the 3600HGV make no other changes in settings.

The above makes sense, because if you turn off wireless on the modem, then you can have two DHCP points - because the units use different subnets. The modem uses 192.168.1.X, and the router uses 10.0.0.X by default. Although, I don't think devices connected directly to the modem would be able to see devices connected to the router, since they'd be on different subnets.

 

Now that I think about it, I wonder if you even need to turn off wireless on the 3600HGV - you could run them both.

As a community service, I can confirm that the above configuration works without modification and without turning off wireless on the modem.

 

How to use a Netgear WNDR3700 with an AT&T 2Wire 3600HGV VDSL modem

1. Connect a PC via ethernet wire to the N600.
2. Connect the N600 yellow "Internet" port to an available port on the 3600HGV.
3. Make sure your PC isn't connecting wirelessly anywhere - it should pick up an IP from the N600.
4. Enter 10.0.0.1 to access the N600 setup page.
5. Click Basic Settings.
6. Under Internet IP Address, select "Get Dynamically from ISP".
7. For Domain Name Server, select "Get Automatically from ISP".
• Note that the above settings are set to static IP when you use the N600 with a straight up modem.
8. Router MAC Address, set to Use Default Address.
9. Does your internet connection require a login? No.
10. Click Apply. The router will then fetch an IP from its DHCP server (i.e., the 3600HGV modem).

You should now have internet access via the PC.

 

Couple of things - both the N600 and the 3600HGV are now DHCP servers. This config works, because they are serving entirely different IPs - the 3600HGV serves up 192.168.1.X IPs, and the N600 serves 10.0.0.X IPs. They don't conflict. And now you have two units sending out a wireless signal - which you may like or not. 

 

To summarize:

• Both the modem and router are DHCP servers.
• Both serve different subnets, so there is no conflict.
• The modem is configured normally, as though the router is just a switch, and it needs no special settings.
• Plug the router's Internet (WAN, yellow socket, etc) to one of the modem's ethernet ports.
• Set the router to fetch a dynamic IP and DSN.

 

Now you have the option of plugging into either device. I haven't tried it, but I assume that if you connect a PC to the modem (either ethernet or wireless) it won't be able to "see" any PCs connected to the router, and vice versa.

Can I connect to the Internet with just a router? Or do I need a ISP?