![]() ![]() Bellow are a couple of actual example traces to illustrate the obvious issue.īad connection example at peak times (speedtest: 3.5Mbps down / 1 Mbps up): The tech was knowledgeable, I was able to show him the traceroutes, but my internet problems continued. Signal levels at the modem were very good throughout this whole process, there was nothing marginal. I couldn't convince anyone at Comcast even for a millisecond that there is possibly a problem at their end, something was wrong at their node ? I couldn't convince anyone to even look at the traces at this point.Īfter jumping through a few hoops, a tech came out to the house, signal levels looked ok, but he did find a somewhat problematic fiber tap on the street and moved me to another leg. I did the "reboot modem" dance a dozen times, I had to unplug my NAT router and use a client PC directly, I listened to "we don't detect a problem on our end", there is "no issue in the area", "your modem is bad and needs to be replaced", and my favorite: "your cable modem is not supported" (I do have a retail-bought Motorola/Arris SB6141 that is actually DOCSIS 3.1 compliant and on the Comcast recommended list). It was happening every day between ~5pm and midnight.Ĭalling Comcast every day lead me through the usual mindless maze of low-level support tech recipes (even though my modem signal levels were great). ![]() I was experiencing terrible speed and latency spikes in peak hours (900+ milliseconds to the first/second hop), as well as speed drops down from ~30 to 3-4Mbps downstream, and from 6Mbps to ~0.3Mbps upstream. A day or two later I noticed my worry-free internet was turning into a nightmare. I had to call the cable company to change some TV package, and we had to reboot/reprovision the modem as well. I was enjoying a great, stable internet connection from Comcast, with the fiber running at the street about 30 feet from my house, with a strong clean signal to my SB6141 modem. ![]()
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