Router losing connection to Cable Modem

No, the coax hits my house underground and then enters my modem with a few pieces of coax and a couple of barrel connectors. I only have internet at this address. No cable service. Thx for looking. Thoughts?

Updating: I am an independent IT person in Orange County. I have lots of clients who use Apple Airport Routers. Since my last posting here yesterday, I have had 6 more calls from people who are losing their Internet connection. The connection always returns after they power cycle their Router. Again, they all have Apple Routers.

I pretty much know they are suffering from the IPv6 Cox rollout situation because when they lose connection I tell them just unplug/re-plug Router and do not touch modem. When Router comes back up, connection is restored. Of course, they confirm the connection will eventually be lost again and again.

I then go into their Airport Utility and change the IPv6 setting from Automatic to Link-Local Only. This change is successful most of the time, but sadly not all of the time. Sometimes I also go into the Network setting fo their computers and change those IPv6 settings to Link-Local Only.

The saddest part about this whole thing is that people are spending their money buying new modems and routers because they naturally think those are broken. Especially considering when they call Cox Tech Support and get a rep is not yet aware of this IPv6 mess, they tell the customers there is nothing wrong with the modem or modem connection to Cox, so it must be the customer's own equipment, which Cox of course does not support.

I know Cox is aware of this issue. It would be nice if they would send emails to all customers, or include a notice in all billing statements, advising of this massive problem. Apple Routers are some of the best selling Routers. I have countless clients who use them. Heck, I use them.

I truly hope Cox will not rest easy until this IPv6 issue is fixed. Thank you.

MichaelJ,

I have tried 3 different routers, 3 different modems, and 3 different cables connecting the routers to the modems. All of these actions have not resolved the problem. I have 16 devices running on my network. I cannot do as you recommend for that reason. I am convinced it is not a hardware problem on my end. As a side note. I looked at my modem configuration and it says it is running 

Hope that helps.

Sadly, I have to add myself as a victim of these random internet outages and today one of my

main data files I use and depend upon was corrupted beyond repair while doing a cloud-sync when

my internet connection was lost; I have read all the posts on this thread and my configuration is like

many of you out there: Motorola Surfboard SB6183 Cable Modem, Airport Extreme Router (6th Gen),

Gigabit switch, all ethernet network to macbooks, Win 10 Laptop, Qnap NAS boxes, HD Homerun, and

5 or 6 wireless clients; this thread started last Nov; my random internet outages started about 10 days ago and I just assumed Cox was having infrastructure issues so I really didn't pay much attention but then the frequency of

the outages began to increase and then today with my loss of data I began to research the issue and found this

thread; at this point all I can try is to disable ip6 on the router/mac network and see if I can get a reliable

system; I will report back after a few days with the results

Yeah. Didn't even last 12 hours before I had to reboot. So, setting IPv6 to tunnel is a red herring as well. 

Yes indeed, setting IPv6 to Tunneling will not work. I have now configured so many routers and computers for clients, and the most successful is to both change your Router IPv6 setting to Link-Local Only, and your computer network adapter's (whether Ethernet or WiFi) IPv6 to Link-Local Only if you have a Mac. If you are running Windows, simply uncheck IPv6 in the network adapters properties setting.

Yes, the above is not guaranteed to work for everyone, but I can report it is working for the majority of my affected clients so far. Good luck. (And of course, how about the day when Cox shuts off IPv4 completely? All those countless people who are shutting off IPv6 are gonna have to go back in and turn it back on on every Router and computer. I hope Cox will give its customers plenty of warning before IPv4 is fully no more.) 

Yes..I forgot to toggle IPV6 off on my bridge router; good catch..thanx..

@ChrisL I am not experiencing any loss of connection with Cox, as my Apple Airport Extreme IPv6 setting is set to Link-Local Only. Using Cox's Online Speedtest, which I ran this morning, my Latency is a very nice 8ms. My download speed is 293 Mbps. My upload speed is 33 Mbps.

If you read all of my postings here for this IPv6 issue, you will see that I am reporting my experiences with many clients I have in my area who have been hit with the IPv6 connection mess who are Cox customers and who have Airport Routers. I am posting what has been the most successful fix hoping to both help others and let Cox know so they can be aware of just how far widespread this problem is, etc.

I appreciate that you are here to help us Cox customers. Thank you.

SB6183 uptime just clicked over 24 hrs with the IPv6 fix in place; this appears promising at least for a band-aid as I have not gone one day in the last 10 w/o power cycling the modem to get an internet connection back!!

Cox's latest update on their support page regarding the IPv6 rollout is March 10th, 2016, as of this posting. The link to the Cox page that explains everything is:

http://www.cox.com/residential/support/internet/article.cox?articleId=0bced860-9666-11df-6baf-000000000000

Here is the excerpt under "Known Incompatibilities With IPv6":

"The majority of retail home routers, especially those produced within the last few years, are fully IPv6-compatible. Cox has determined that Apple AirPort Extreme routers, including Time Capsule models, can experience Internet connectivity problems when running IPv6 on firmware versions 7.7.3 and earlier. Customers can resolve the issue by disabling IPv6 from the AirPort Utility on the iOS or OS X device. For more information and steps to resolve, contact Apple Support."

I would like to add to the above that I have seen Apple Airport Express Routers also be affected.