6

In my home network, I have to use AT&T's router. It is a Motorola NVG510.

Behind this router is my personal router, a dual band Netgear TL-WDR3500 with USB ports for my NAS drives.

The AT&T router connects to the DSL line, and has its wireless radios turned OFF.

  • IPv4 Address: 192.168.1.254
  • Subnet Mask: 255.255.255.0
  • DHCPv4 Start: 192.168.1.64
  • DHCPv4 End: 192.168.1.253

AT&T Settings

My Netgear router connects directly to one of the switches on the AT&T router.

  • IP Address: 192.168.0.1
  • Subnet Mask: 255.255.255.0
  • Default Gateway: 192.168.1.254

Netgear Router

I want to setup the Cascaded Router feature, but to do that I need to supply the following:

  • Cascaded Router Address: The IP address for the router behind this device. The Cascaded Router Address should be in the LAN Private IP subnet range.
  • Network Address: The Network Address that defines the range of IP addresses available to clients of the cascaded router.
  • Subnet Mask: The subnet mask that with the Network Address defines the range of IP addresses available to clients of the cascaded router.

Everything I try gets kicked out as invalid.

For the Cascaded Router Address, I always enter 192.168.0.1, since that is the defined as the router address on my Netgear router. That only leaves Network Address and Subnet Mask.

Network Address 192.168.1.253, for example, is rejected because it is not in the network address given subnet mask 255.255.255.248.

I got Cisco certified in networks about 10 years ago, but I was never able to get a job in networks. I can't remember how I am supposed to calculate the network address ranges and subnet masks anymore.

Can someone give me this information? I would also like to know how to go about calculating these for my information, just in case something changes down the road.

Improve this question
1

2 Answers 2

Reset to default
2

Here is what I got to work. (Update: see my comment below; this stopped working the next day.)

I had to configure the subnets. What worked for me was only allowing 1 IP address:

Subnets

Next, I had to configure the firewall to allow IP Passthrough:

Passthrough

At this point, I rebooted the AT&T router modem.

While that was going on, I used my wireless network card to configure my Netgear router. I had to change the IP address, Default Gateway and Primary DNS:

att_netgear_settings

By the time I was doing all of that, the Motorola router modem was through rebooting, and HERE I AM! :)

That was a lot of work for me!

Hopefully, someone comes along later and gets some good out of it.

Improve this answer
1
  • OK, that worked great last night. Today, though, it does not work. It seems as though AT&T is no longer able to authenticate my account using the Motorola router, so I am stuck trying to find out how to "undo" these settings.
    – jp2code
    Commented Oct 8, 2015 at 13:23
1

Both routers need to be in the same subnet. In your case this would mean a range of 192.168.1.1 - 192.168.1.7. This means that your routers WAN IP has to be in this IP address range.

The detailed steps are explained here:

https://forums.att.com/t5/Features-and-How-To/How-to-put-the-Motorola-NVG589-in-bridge-mode-or-as-close-as-you/m-p/3552057#M39255

Otherwise, why not dual NAT and put any servers, NAS etc. into the outside one? My RPi makes for a decent VPN and NAS.

Improve this answer
7
  • So, I can only issue out six (6) IP addresses? I have more devices than that in my network. How do I fix that?
    – jp2code
    Commented Oct 6, 2015 at 13:50
  • As for your "otherwise" question: AT&T's router is all that AT&T's network will connect to. I have to use the one AT&T issues me. My account is bound to the MAC address of that device. AT&T's router is plain vanilla. It does not have any features.
    – jp2code
    Commented Oct 6, 2015 at 13:51
  • The otherwise scenario seems to be working looking at your screenshots. The TP-Link has an IP address assigned from the AT&T router and performs NAT just fine. See the edited answer.
    – kcrk
    Commented Oct 6, 2015 at 14:01
  • So, is BRIDGE MODE what the rest of the world calls these Motorola Cascade Router terms?
    – jp2code
    Commented Oct 6, 2015 at 14:11
  • Yes it appears that the Cascade Router mode is less like a Bridge but more like a DMZ. forums.att.com/t5/Residential-Wi-Fi-Gateway/…
    – kcrk
    Commented Oct 7, 2015 at 8:09

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .