3801HGV gateway blinking lights - flashing Red Service light, Green Broadband light

Based on what you said, they might need to repair something on the outside lines. You'll only know once tech checks your services.

Or there's also a chance that you and your neighbor are connected to 2 different terminals (yes it happens even if the houses are right next to each other) and there was just something wrong inside your house or with the gateway.

If it was an area outage then both of your services should have stopped at the same time. Perhaps it was just a complete coincidence.

I just got these segment of the gateway log after clearing it and determined the repeating pattern inside it. From what I can see on the INF type entries, there is a DSL connection, but I'm assuming the errors (ERR) are on the broadband module (bband).

Anyway, here they are in case they are useful to someone on level 2 support... I can post / look for specific entries if needed. 

If there is something wrong with the outside lines, why would my gateway, and my neighbor's one too, connect at the DSL level and not at the broadband level ??. Wouldn't both system be totally down even at the physical level ?? 

It was probably a coincidence, but I left the gateway unplugged for the night and powered back in the morning when the gatwway was able to connect back, ie, got service.

Since it was already scheduled, the ATT technician came that afternoon and did some tests, everything checked out but he replaced the gateway with a new model anyway. Problem hasn't happened again.

To me it was something related to ATT servers providing an IP address through the DSL connection that got sorted out at night. My suggestion, report it to ATT and get a technician there in case there is something else going on.

Your router is being knocked offline by one of your neighbors who is attempting to gain access to it. They are using a high gain directional antenna and a wifi antenna along with software that technicians use to find wifi signals. A few of the programs they could be using are named Kismet, wireshark, or inSSIDer. The way it works is they find wifi signals in their surrounding area with the high gain antenna and the wifi antenna. Once they locate a satisfactory signal they use the software to attack your router with “deauth” attacks. AT&T 2WIRE routers are the only wifi routers affected by this, Time Warner or Comcast do not have this problem. One deauth attack is the flood of lines your are asking about, another is a “packet flood”. Once the router is knocked off line after several seconds the signal comes back online, re-authorizing all of the equipment that has the correct password. The software is try to catch or hijack that “handshake” between the authorized equipment, and if you have a weak password or are using weak encryption like WEP then in a short time they can steal your password and access your router and do what they are trying to accomplish.

This is what has been happening to me for the last 2+ years, and I know who is doing it. I had a new neighbor move in one floor beneath me a couple of years ago. Within the first couple of weeks he approached me and offered to pay me per month if I gave him my wifi password. I declined and that is when the problems began. At first I thought it was equipment issues or there was something wrong with the line outside. I had service technicians out numerous times and they found nothing wrong with my equipment or anything with the line, and I even replaced my router. I was already suspicious of my new neighbors because of the offer he made plus he had a suspicious device tapped to an American flag he had on his balcony. It was a small plastic looking black box surrounded by a bunch of tape with a grey cable coming out of it going into his apartments sliding glass doors. I took me some research on the web to find out what was going on, but after a edited my routers Advanced Firewall settings to filter for UDP and Packet Flooding I could see the deauth attacks in the logs. Searches on UDP and Packet flooding turned up all the information I am sharing. The device he was using was a high gain directional antenna. Apparently you can use a wifi antenna with the high gain directional antenna and find wifi signals up to 2 miles away. After my first service call, my neighbor removed the device from the flag and took it inside after he heard me discussing the whole situation with the AT&T tech. Right after that I started to hear little sliding noises like someone was sliding something plastic on the ceiling or trying to position something.

I have called AT&T Uverse technical support scores of times, but no one there seems to know how to, or is willing to help solve this issue with their 2WIRE router vulnerability. There are a lot of forums that talk about this on the web, it is a pretty well know issue. When I call AT&T they try to talk me through the basic spiel of changing my password or hiding my SSID which is the worse thing you could do because the hacker can see your wifi signal a whole lot faster because when all the signals in the area are displayed yours will be the one that’s blank and the will go right after it. I would think they would want to solve this problem because if more people who are having this problem in there area knew how this was happening, and that the competition does not suffer from this then they could lose a lot of business.

I prefer AT&T and would go without internet before I would go to Time Warner, I just wish there was a way to put a stop to these deauth attacks or a way AT&T could set up something to catch these hackers. I pay my bill every month and I should be able to enjoy my service without these constant interruptions in service.

I may have found a fix for my neighbors who are hacking me. Recently they have stepped up their attempts and were constantly knocking my router offline around the clock. I unplugged it for a few days and when I finally plugged it back up they were right back at it. I knew they were doing it again because it didn't start until they came home from work. Whenever I confronted them about it in the past they would stop for a few days but would be right back at it again. I called the police over and they tried to talk to them but they wouldn't answer the door and we could hear and see them inside. No warrant so they just could ignore us. SInce I have no physical proof there is nothing legal that I can do.

SO!

After all this they were just terrorizing my router. They must have had the program running in the background. I had an old Belkin router with N type security and that stopped them for 2 weeks! I thought I had them beat! NOPE!!! Once they got around that. everytime I plugged in my router they would be on me in minutes. So due to the constant interruptions I was able to experiment. 

In the past under (Advanced Configuration in the Firewall settings), I was able to stop the packet flooding by setting the UDP Session Timeout to over 20000 seconds. That seemed to make the packet flood loop for over an hour which didn't knock the router offline. I still do that to this day! They then started to attack me with TCP attacks wich I still dont know how that works but I set that for under 8000 seconds and that seems to help. Then I checked all of the Attack Detection boxes except "Ecessive Session Detection. That one seems to interfere with the routers operation.

NOW THIS IS WHAT I DID THAT SEEMED TO REALLY HELP!

I unchecked All of the Outbound Protocol boxes and only checked "HTTP and HTTPS". The router did not get knocked offline after this!!! I was abel to connect with my phone, the PS4 was abel to connect to the PSN and I was able to still connect with my laptop. I should mention that I only use ethernet for my PC now, I have disabeld my wireless and Bluetooth drivers because I don't know how capable they really are. I was unable however to connect the PS3 and the Chromecast to the internet! I found out that by checking the "All Other Protocols" box I was abel to connect those devices, but more important they stayed connected after I unchecked the box after they connected! I think it is vital to keep these boxes unchecked because I think the program they run must run through one of these Outbound Protocols to transmit the "Deauth Attacks to your router.

So far I have not had any knock offs since doing this! I'm not holding my breath because they have always worked around my defenses before but I will keep updating if they do. I hope this helps.

New update!

If you're still experiencing this issue check the available WiFi signals in your area. If you see any that say MotoVAP, then someone around you is using a Motorola Vap as a WiFi bridge in your area and are possibly trying to root your AT&T uverse router. If this is the case research Motorola vap or MotoVAP. I'm still researching the full implications of what I was just exposed to! This device can be bought retail but is typically for Commercial use, if you're in a residential area such as an apartment and you see this MotoVAP ssid available this should cause you concern especially if you're a uverse customer. The 2 wire router is the only thing that can be used with this device, Motorola designed it exclusively for AT&T for use with the 2 Wire router. If this is your situation contact AT&T and get help. They may not know what is happening but if this is what's been going on all this time then they should be alerted. I just received a new type of router from AT&T and I am monitoring it to see if it will be affected. But since it's installation I have noticed that the MotoVAP ssid has disappeared. Let us all free ourselves and help AT&T stop the 2 wire hackers. I know who mine are, but without physical proof law enforcement cannot help me. They live directly below me. They use a WiFi access point device that is the Motorola Vap to try and root my 2 wire router. I hope this new router defeats them. Send the leaching coc-kroaches into the abyss! I need the power of the Patriot Act against these infidels! I would have never been the wiser if he hadn't asked for my password first. After I refused his request is when this began over 3 years ago. As stated in the first post I saw the WiFi access point, he tried to disguise it by taping it to the eagle of our beloved flag right out on his patio directly beneath my patio. I didn't know what it was before but now I know. My technician told me that every time he goes out on a call like mine he notices the ssid MotoVAP present but didn't know what it was. I Googled it and my eyes were opened. The image results showed me the box that was taped to the eagle! I know now what they use. Google MotoVAP and see, find out if you are in the same boat as me. If this new router /modem works I will forever bless this day! I believe it's a 4 wire but I'm not at home but I will update as soon as I find out its name! 

The only area I can find where VAP (Virtual Access Point) is used for residential use is in Canada. Bell Atlantic offers FibreOP TV and internet service in various regions of Canada. I haven't found any US locations available for this technology. I will continue to research this more.