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Weird network problem with CAX80 cable modem
My cable went out 3 days ago after 4 months without issue, and no changes on my side. The modem showed a problem with too much power on downstream, so Comcast came today and fixed that. Apparently ...
I factory reset the modem last night, and after 15 minutes, everything started working. So something must have gotten corrupted in the modem memory/cache of the modem. I am back down again, but this time it seems like a normal Comcast outage. Thanks for the help.
Yes. In fact, the (win10) laptop connected to the router was configured for Google DNS (8.8.8.8). The first thing I tried was to switch it back to the Comcast DNS. The monitoring software on the laptop (a small app that continuously pings to see if the Internet is connected, and tracks outages) that was failing on the pings to Google (8.8.8.8), Cloudflare (1.1.1.1), and level 3 (4.2.2.2).
I later tried from my primary laptop (win11), and found the same behavior on both. The really weird part is how some IP6 addresses are working. I would think Comcast, but how are the neighbors all working? I'm going to ask Comcast to try one of their modems; perhaps the CAX80 is no longer supported.
and you changed the ipv6 dns address as well?
I switched it from manual (the Google DNS) to automatic, meaning that it got the addresses from the modem, and that got the addresses from Comcast.
I verified that the Netgear modem was set to pass through DNS. I did not try and set it there. Pretty sure it only allows you to set iP4 addresses in that UI.
So, no, I didn't do anything else to remove or add IP6 addresses.
In addition to the two laptops, I tried an ipad and iphone. Just browsing, not pings, but saw similar results (Google worked, Amazon and others failed).