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chelmite's profile

Contributor

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3 Messages

Saturday, July 11th, 2015 6:43 AM

Trouble setting up router behind 3800HGV modem

I'm trying to set up a router for internal (home) use only, no access from the internet.

I have AT&T's 3800HGV 2Wire modem, a D-Link router, and a Netgear router. Both routers are connected to the 2Wire.

 

The 2Wire configuration screen shows the Netgear router as having address 192.168.1.12.

The D-Link has address 192.168.1.2. The D-Link gives addresses 10.0.2.xxx.

When I try to connect to 192.168.1.12 via my browser from a port on the D-Link (through the 2Wire), the connection times out, and pings don't get any packets through.

 

I tried connecting the 2wire to a peer port on the Netgear, but then the Netgear then thought it didn't have a connection to the internet.

 

Any help setting this up would be appreciated.

Jeffster

ACE - Professor

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2.6K Messages

8 years ago

Take a look at this post.

 

mibrnsurg

Expert

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20.4K Messages

8 years ago

@chelmite  easier method is this from ComputerJoe:

 

This is what I did to use an "internal" router. I set my "internal" router to use DHCP for the WAN address, plugged it's WAN port in to the RG, reboot the "internal" router, let the RG assign a local address to the "internal" router and then set that address to the DMZ in the RG's management interface. When I go to the "internal" router's management interface it shows as having the same WAN, gateway, and DNS addresses that the RG uses.

 

I set the "internal" router to assign addresses to "my" side of the network in a different IP range than what the RG uses (192.168.2.* instead of 192.168.1.*) but using the same subnet mask (255.255.255.0). My internet works fine with no interuptions and local network tasks (back ups, streaming, etc.) work as expected.

 

I can also still access the RG from "my" side of the network when I need to without having to change any network settings or swap any cables. Leave DHCP running on the RG. You do not need to disable the firewall in the RG as the DMZ will open a pinhole through it to the address you pick (your internal router). If you have existing wireless on your router that your satisfied with and want to keep, just make sure to turn off the wireless in the RG.

 

As for the STBs they should be run straight out of the RG with CAT5 or RG6 Coax.

 

Good luck 😉

 

Chris
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Contributor

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3 Messages

8 years ago

When I set that address to the DMZ in the RG's management interface, the RG assigned a new address to the internal router that was an outside address. This is completely wrong. I want the internal router accessible only internally, not at all from the outside.

mibrnsurg

Expert

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20.4K Messages

8 years ago


@chelmite wrote:

When I set that address to the DMZ in the RG's management interface, the RG assigned a new address to the internal router that was an outside address. This is completely wrong. I want the internal router accessible only internally, not at all from the outside.


Nope, that's the way DMZ works.  It's designed so if necessary an outside source can reach the internal router or anything using it (security cameras, other devices accessed away from home).  Security should be on on the internal router as there is no protection from the RG. 😉

 

Chris
__________________________________________________________

Please NO SD stretch-o-vision or 480 SD HD Channels
Need Help? PM ATT Uverse Care (all service problems)
ATT Customer Care(billing and all other problems)
Your Results May Vary, In My Humble Opinion
I Call It Like I See It, Simply a U-verse user, nothing more

Contributor

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3 Messages

8 years ago

I want to keep my internal network internal. I don't want to expose my internal network to the outside.

I want to access my internal network from other nodes on my internal network.

Perhaps I shouldn't be using the 2wire for that. Should use the Netgear as the hub for all things internal and the 2Wire as the way for internal nodes to get to the internet?

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