So, the AT&T is in the loop, but all it's doing is serving as a modem. So the ASUS can recognize attempts to reach this address from inside my local network, and perform its NAT Loopback function, and everything works as desired. But here's the key: The WAN address provided to the ASUS by the AT&T is the real external WAN address of the network. In this mode, the AT&T Router just forwards all inbound traffic from the external network to the attached device (in this case, my ASUS Router). I hooked its WAN input to AT&T's Router and put the AT&T Router in "DMZ-Plus" mode. It turns out that I had (lying around) an ASUS RT-N56U dual-band wireless router. This feature allows one to have a server (for instance) in their local network, and reference that server by the external IP address (or domain name) of the WAN network. NAT Loopback (aka "hairpinning" or NAT Reflection) is a "feature" of some (not all) routers that when the external IP (WAN) address of the network is referenced (from the client side of the router), the router recognizes this as a "special case" and loops the request back into the local network, through the firewall. So, II'll be calling AT&T to tell them I either want this fixed (not likely) or put me back on my former 18Mbps service with a 2Wire modem. But based on this thread, there's no hope for the second problem I'm screwed. I could (hopefully) resolve the first problem (dropping WiFi) by replacing the (defective) modem. This is a royal pain, because mobile devices (like an iPhone or iPad) cannot be configured with the external IP address of the mail server because that will only work when outside my home network when inside, it fails, because the 5268AC does not support NAT loopback. This had always worked fine with the 2Wire (for 4 years), but stopped working with the 5268AC. 2) I can no longer access my internal email server using my external IP address. As part of the "upgrade", they swapped my old 2Wire model/RG for a new Pace 5268AC, which has two problems: 1) It drops WiFi periodically. AT&T solicited ME to "upgrade" my 18Mbps internet service to 24Mbps, which I (regrettably) agreed to. "AT&T MAKES NO WARRANTY THAT (i) THE SERVICES WILL MEET YOUR REQUIREMENTS, (ii) THE SERVICES WILL BE UNINTERRUPTED, TIMELY, SECURE, OR ERROR-FREE, (iii) THE RESULTS THAT MAY BE OBTAINED FROM THE USE OF THE SERVICES WILL BE ACCURATE OR RELIABLE, (iv) THE QUALITY OF ANY PRODUCTS, SERVICES, INFORMATION, OR OTHER MATERIAL PURCHASED OR OBTAINED BY YOU THROUGH THE SERVICES WILL MEET YOUR EXPECTATIONS, OR (v) THE SERVICES WILL NOT CONFLICT OR INTERFERE WITH OTHER SERVICES FROM AT&T OR THIRD PARTIES THAT YOU RECEIVE AT YOUR PREMISES.". After reading their "warranty" sections from July, 2016 TOS, it seems they don't really have to provide you with anything and really glad I avoided this poor attempt.
Sad, they have all this optical and fail to deliver basic functions in the last 50ft of their expensive fiber nodes! What's also sad, is that they tried to charge their crazy $180 fee, after 28 days of horrible service and found they also no longer honor the 30 day money back and after speaking w their manager to get my fee waived. After the case ID was created (which looks like they removed from this forum), I have heard not a peep from ATT to acknowledge, let alone attempt to fix. Glad I cancelled! Now have 75Mbps w Hairpinning for $10 less than the "24Mb" att struggled to provide.
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