InkStainedDude's profile



7 Messages

Sunday, July 8th, 2018 4:02 PM

Random Restarts of NVG510 after AT&T Update To Version 9.1.0h9d61

Random restarts occur on Arris / Motorola NVG510 dsl modem.


These followed the update to 9.1.0h9d61 by AT&T.


In an effort to solve the problem I inspected the settings and noticed that ipv6, which had been disabled, was re-enabled. I also discovered many new filter options had been added to the firewall advanced settings page, many of which were enabled by default. I assume all of this was the result of the update to 9.1.0h9d61.


I have since disabled IPV6 again, and the restarts have dropped in frequency, but still occur far more frequently than they had been. Up until this most recent stint of random restarts, we enjoyed about a two-year run without noticeable interruption. If restarts occurred, they did so overnight when no one in our household was on the LAN. 


The restarts we're experiencing now occur between 4 and 12 times a day, so I continue to search for a cause. The system log offers little help as the restart reasons are always the same: "DSL: Retrain Reason RDI." Not much help there.


So, I'm wondering, since the IPV6 is disabled, should I also disable the "Reflexive ACL" filter in the firewall advanced settings? Based on the glossary text provided on that page by AT&T, the Reflexive ACL is for use by IPV6, which made me wonder whether it's now creating it's own new, problematic errors now that IPV6 is disabled. 


Some forum contributors in the past have suggested disabling "Reflexive ACL" and IPV6 at the same time, but those posts were years old and I want this to be a more informed choice, which is why I am posting this here.


I can't be the only person who has experienced a dramatic spike in random modem restarts since mid June 2018. And, again, it seems those restarts also coincided with the update of my NVG510 to version 9.1.0h9d61 by AT&T. Also as apart of this update, I notice that all references to the NVG510 as a "Motorola" product have been changed to "Arris" on the settings and status pages for the DSL modem. 


If anyone knows of any problematic default settings that might need to be adjusted following the update to 9.1.0h9d6, please share them here. Thank You.



7 Messages

6 years ago

Here's what I did to stop my NVG510 from experiencing frequent drops and reboots following the firmware update:


1. I systematically ruled out all devices on my LAN as potential causes by removing them from the network, one at a time, over the course of several days to see if the drops continued or diminished in the absence of that device. After each removal, I unplugged the NVG510 DSL Modem and let it sit for five minutes before plugging it back in to power up. None of these devices proved to be a cause.


2. The Firewall Advanced menu changed significantly following the firmware update. Not only were new options added, and enabled by default, but many options that had previously been disabled were turned back on. I went back and compared the previous Firewall Advanced menu settings to the new ones and turned off everything that the update turned on again.


3. As with the Firewall Advanced menu, at least one other setting that had previously been disabled was suddenly turned back on. This likely also contributed to my sudden spat of random rebooting issues. On my modem, it was the "IPv6" setting that AT&T changed. It had been set to "off," but following the update it was switched back "on." I turned it off again.


4. I replaced all DSL filters throughout the house (there were only two of these, one of which was on a second independently wired phone line not associated with the DSL line). Both of these filters were about two years old and, like anything else, they can go bad. No idea whether either of these were contributing to the problem, but they were cheap and easy enough to replace. For those not familiar with the term "DSL filter" it's that little dongle thing, about four inches long, into which you plug the phone and DSL cords, and then, in turn, you plug the dongle into the wall socket. These filters vary in design. Some are made with just one slot for a phone cord. Others are made with two slots, one designated for the phone cord, and the other accommodates the DSL line. Make sure you use the appropriate slot. Plugging your DSL line into the slot meant for the phone cord will render your modem unable to make a connection, and will likely fill your phone with static, or worse.


5. I sought out other potential sources of radio frequency interference, including a wireless Microsoft mouse, circa 2004, that uses one of those hockey-puck receivers that plugs into the usb port on the computer. In my case, that puck was sitting right on top of the ethernet cable between my computer and my NVG510 DSL modem. I can't prove this had anything to do with the drops, but it's possible that the hockey-puck receiver could've been creating just enough radio frequency interference to cause the modem to lose its connection and prompt a reboot from time to time. This wouldn't account for the many late-night reboots, because the computer and mouse were all powered off during this time period, but it might've been a contributor to some of the daytime drops. Regardless, I tossed that old mouse and updated it with a new wireless Microsoft mouse that utilizes Bluetooth.


6. I inspected each and every phone cord and ethernet cable throughout the house, not only for condition but also for placement. In cases where a cable was anywhere near an electronic component, such as display monitor powerpacks or powered usb hubs, I created as much separation as possible. In addition, although the one and only phone cord had no visible signs of wear or failure, it was easy to replace it with a new one.


One of these fixes, or a combination of two or more, has completely solved the problem. The settings adjustments definitely resulted in fewer random restarts — from more than 10 a day down to 3-4 a day. My suspicion is that those remaining 3 to 4 random restarts every day were being caused by a faulty DSL filter. If I had to bet, that's the one I'd put money on.


I'm posting this here in the hope that it helps the next person find a solution to this problem.


Unfortunately, I had to figure all this out on my own.





1 Message

6 years ago

My NVG510 modem also started to require multiple reboots each day beginning about 3 weeks ago. Since we first got signed on to AT&T's UVerse, we have not used the phone line filters, as they said they were not needed. Anyway, the modem worked fine for over a year and now the problems begin.

Regarding updates installed by AT&T, I would not know how to access such, turning the changes that they made either off or on.  Please tell me how to access these areas. Thank you! 

As far as assistance from AT&T, ....pfffft! 45 minutes on the phone only yielded advice to pay them $99+ to send a technician.

PS: I do not like the UVerse phone line. In a power outage, which happens often in rural areas, there is NO phone line. The old land lines always had juice.

Thanks for any direction you can give.

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