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Help with unstable latency over cable modem service

Last response: in Networking
December 14, 2010 1:14:35 AM

I am having real trouble with my cable modem connection. I have Mediacom cable modem service. From the modem, I have an Ethernet connection to a Netgear Router / Switch FVS318v3 with the latest firmware. From there, several devices are wired Ethernet connected. My main symptoms are very poor performance streaming (Netflix or PlayOn) despite have very consistent 6MB - 8MB connection bandwidth.

When I run a tracert I get very unstable results. One minute my hops past my modem can be >600ms or more and then 5 minutes later they can be <30ms. When the Mediacom techs come out, they can never find any issues.

Here are my latest tracert results:

These were within 5 minutes of each other last night. Can anyone guide me to how to troubleshoot something like this? Thank you.
December 14, 2010 4:39:40 PM

Get ahold of AT&T. This is 100% their problem. Your latencies out to their nodes are acceptable. Once the traffic hits their network, it all goes to hell.
December 15, 2010 1:21:10 AM

Here is the screen that you requested. If you could, I'd appreciate an explanation of what this screen is telling me. This screen is new to me and I am not familiar with what I can learn from it.