I'm hoping someone can help can me with a networking issue behind my Uverse residential gateway. I have a feeling that when/if I contact AT&T and my router manufacturer, they will just point the finger at each other.
For almost 5 years I had Uverse coming into my home via the existing coax that was in place when I bought the house. It was connected to a 2Wire RG. Over those years, we had frequent problems with dropped Internet connections at the RG. I'll come back to that in a moment.
In the fifth year I added two internal routers so that I could operate seperate networks and keep unproven (security-wise) devices - like a Nest thermostat, guest devices and future so-called Internet-of-things purchases - off the network with the computers. I got a new ASUS RT-AC66U for the main LAN and flashed an old Linksys WRT54G2 with DD-WRT for the alternate LAN. This Y-configuration, two routers with separate internal networks (192.168.2.x and 192.168.3.x) behind the RG (192.168.1.x) was working great. This is what I am trying to achieve again. I'm not really looking to deviate from this configuration.
In the sixth year AT&T finally decided to switch my Internet off of the coax to the pre-existing phone line (which we have never used because we just use our cell phones) in an effort to resolve our dropped connections. In the process, they changed the RG to a Motorola/Arris NVG599. The good news is that our Internet connection as been vastly more reliable.
The bad news is that for some reason, the ASUS does not seem to work behind the new RG. I cannot figure out why. It does not seem to receive an IP from the RG via DHCP nor does it work with a manually configured WAN IP in the 192.168.1.x range (the LAN of the RG). The Linksys kept going without a hiccup. I can take the patch cables going from the LAN of the RG to the WAN of the routers and swap them and the Linksys keeps working and the ASUS still does not.
This makes no sense to me because I thought that neither the router nor the RG should be able to "know" about the other in anyway way that would cause a problem. I'm 90% sure I made no changes to the old RG to make this work and I really should not have to. To the RG, the ASUS is just another internal network device on its LAN. To the ASUS, the RG is just like any upstream gateway. The *only* thing I could imagine is the ASUS detecting an internal IP on its WAN and potentially having a problem with that, but since it was working in exactly that scenario for months behind the old RG, I don't know why it would not be doing so today.
I've tried doing a complete reset on the ASUS and setting it up again with manual IP and with DHCP, but it is just dead-in-the-water.
If you have any ideas or experience in this area, I'd appreciate your feedback.
Thanks
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